[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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[1192] | 27 | // $Id: G4VeLowEnergyLoss.cc,v 1.27 2009/07/23 09:15:37 vnivanch Exp $ |
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[1228] | 28 | // GEANT4 tag $Name: geant4-09-03 $ |
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[819] | 29 | // |
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| 30 | // |
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| 31 | // -------------------------------------------------------------- |
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| 32 | // GEANT 4 class implementation file |
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| 33 | // |
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| 34 | // History: first implementation, based on object model of |
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| 35 | // 2nd December 1995, G.Cosmo |
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| 36 | // -------------------------------------------------------------- |
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| 37 | // |
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| 38 | // Modifications: |
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| 39 | // 20/09/00 update fluctuations V.Ivanchenko |
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| 40 | // 22/11/00 minor fix in fluctuations V.Ivanchenko |
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| 41 | // 10/05/01 V.Ivanchenko Clean up againist Linux compilation with -Wall |
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| 42 | // 22/05/01 V.Ivanchenko Update range calculation |
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| 43 | // 23/11/01 V.Ivanchenko Move static member-functions from header to source |
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| 44 | // 22/01/03 V.Ivanchenko Cut per region |
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| 45 | // 11/02/03 V.Ivanchenko Add limits to fluctuations |
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| 46 | // 24/04/03 V.Ivanchenko Fix the problem of table size |
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| 47 | // |
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| 48 | // -------------------------------------------------------------- |
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| 49 | |
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| 50 | #include "G4VeLowEnergyLoss.hh" |
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| 51 | #include "G4ProductionCutsTable.hh" |
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| 52 | |
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| 53 | G4double G4VeLowEnergyLoss::ParticleMass ; |
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| 54 | G4double G4VeLowEnergyLoss::taulow ; |
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| 55 | G4double G4VeLowEnergyLoss::tauhigh ; |
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| 56 | G4double G4VeLowEnergyLoss::ltaulow ; |
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| 57 | G4double G4VeLowEnergyLoss::ltauhigh ; |
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| 58 | |
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| 59 | |
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| 60 | G4bool G4VeLowEnergyLoss::rndmStepFlag = false; |
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| 61 | G4bool G4VeLowEnergyLoss::EnlossFlucFlag = true; |
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| 62 | G4double G4VeLowEnergyLoss::dRoverRange = 20*perCent; |
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| 63 | G4double G4VeLowEnergyLoss::finalRange = 200*micrometer; |
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| 64 | G4double G4VeLowEnergyLoss::c1lim = dRoverRange ; |
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| 65 | G4double G4VeLowEnergyLoss::c2lim = 2.*(1.-dRoverRange)*finalRange ; |
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| 66 | G4double G4VeLowEnergyLoss::c3lim = -(1.-dRoverRange)*finalRange*finalRange; |
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| 67 | |
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| 68 | |
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| 69 | // |
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| 70 | |
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| 71 | G4VeLowEnergyLoss::G4VeLowEnergyLoss() |
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| 72 | :G4VContinuousDiscreteProcess("No Name Loss Process"), |
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| 73 | lastMaterial(0), |
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| 74 | nmaxCont1(4), |
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| 75 | nmaxCont2(16) |
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| 76 | { |
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| 77 | G4Exception("G4VeLowEnergyLoss:: default constructor is called"); |
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| 78 | } |
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| 79 | |
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| 80 | // |
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| 81 | |
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| 82 | G4VeLowEnergyLoss::G4VeLowEnergyLoss(const G4String& aName, G4ProcessType aType) |
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| 83 | : G4VContinuousDiscreteProcess(aName, aType), |
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| 84 | lastMaterial(0), |
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| 85 | nmaxCont1(4), |
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| 86 | nmaxCont2(16) |
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| 87 | { |
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| 88 | } |
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| 89 | |
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| 90 | // |
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| 91 | |
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| 92 | G4VeLowEnergyLoss::~G4VeLowEnergyLoss() |
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| 93 | { |
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| 94 | } |
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| 95 | |
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| 96 | // |
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| 97 | |
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| 98 | G4VeLowEnergyLoss::G4VeLowEnergyLoss(G4VeLowEnergyLoss& right) |
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| 99 | : G4VContinuousDiscreteProcess(right), |
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| 100 | lastMaterial(0), |
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| 101 | nmaxCont1(4), |
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| 102 | nmaxCont2(16) |
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| 103 | { |
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| 104 | } |
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| 105 | |
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| 106 | void G4VeLowEnergyLoss::SetRndmStep(G4bool value) |
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| 107 | { |
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| 108 | rndmStepFlag = value; |
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| 109 | } |
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| 110 | |
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| 111 | void G4VeLowEnergyLoss::SetEnlossFluc(G4bool value) |
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| 112 | { |
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| 113 | EnlossFlucFlag = value; |
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| 114 | } |
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| 115 | |
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| 116 | void G4VeLowEnergyLoss::SetStepFunction (G4double c1, G4double c2) |
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| 117 | { |
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| 118 | dRoverRange = c1; |
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| 119 | finalRange = c2; |
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| 120 | c1lim=dRoverRange; |
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| 121 | c2lim=2.*(1-dRoverRange)*finalRange; |
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| 122 | c3lim=-(1.-dRoverRange)*finalRange*finalRange; |
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| 123 | } |
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| 124 | |
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| 125 | G4PhysicsTable* G4VeLowEnergyLoss::BuildRangeTable(G4PhysicsTable* theDEDXTable, |
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| 126 | G4PhysicsTable* theRangeTable, |
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| 127 | G4double lowestKineticEnergy, |
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| 128 | G4double highestKineticEnergy, |
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| 129 | G4int TotBin) |
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| 130 | // Build range table from the energy loss table |
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| 131 | { |
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| 132 | |
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| 133 | G4int numOfCouples = theDEDXTable->length(); |
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| 134 | |
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| 135 | if(theRangeTable) |
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| 136 | { theRangeTable->clearAndDestroy(); |
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| 137 | delete theRangeTable; } |
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| 138 | theRangeTable = new G4PhysicsTable(numOfCouples); |
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| 139 | |
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| 140 | // loop for materials |
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| 141 | |
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| 142 | for (G4int J=0; J<numOfCouples; J++) |
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| 143 | { |
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| 144 | G4PhysicsLogVector* aVector; |
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| 145 | aVector = new G4PhysicsLogVector(lowestKineticEnergy, |
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| 146 | highestKineticEnergy,TotBin); |
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| 147 | BuildRangeVector(theDEDXTable,lowestKineticEnergy,highestKineticEnergy, |
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| 148 | TotBin,J,aVector); |
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| 149 | theRangeTable->insert(aVector); |
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| 150 | } |
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| 151 | return theRangeTable ; |
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| 152 | } |
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| 153 | |
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| 154 | // |
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| 155 | |
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| 156 | void G4VeLowEnergyLoss::BuildRangeVector(G4PhysicsTable* theDEDXTable, |
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| 157 | G4double lowestKineticEnergy, |
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| 158 | G4double, |
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| 159 | G4int TotBin, |
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| 160 | G4int materialIndex, |
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| 161 | G4PhysicsLogVector* rangeVector) |
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| 162 | |
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| 163 | // create range vector for a material |
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| 164 | { |
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| 165 | G4bool isOut; |
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| 166 | G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex]; |
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| 167 | G4double energy1 = lowestKineticEnergy; |
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| 168 | G4double dedx = physicsVector->GetValue(energy1,isOut); |
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| 169 | G4double range = 0.5*energy1/dedx; |
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| 170 | rangeVector->PutValue(0,range); |
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| 171 | G4int n = 100; |
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| 172 | G4double del = 1.0/(G4double)n ; |
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| 173 | |
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[1192] | 174 | for (G4int j=1; j<=TotBin; j++) { |
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[819] | 175 | |
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| 176 | G4double energy2 = rangeVector->GetLowEdgeEnergy(j); |
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| 177 | G4double de = (energy2 - energy1) * del ; |
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| 178 | G4double dedx1 = dedx ; |
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| 179 | |
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| 180 | for (G4int i=1; i<n; i++) { |
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| 181 | G4double energy = energy1 + i*de ; |
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| 182 | G4double dedx2 = physicsVector->GetValue(energy,isOut); |
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| 183 | range += 0.5*de*(1.0/dedx1 + 1.0/dedx2); |
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| 184 | dedx1 = dedx2; |
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| 185 | } |
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| 186 | rangeVector->PutValue(j,range); |
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| 187 | dedx = dedx1 ; |
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| 188 | energy1 = energy2 ; |
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| 189 | } |
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| 190 | } |
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| 191 | |
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| 192 | // |
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| 193 | |
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| 194 | G4double G4VeLowEnergyLoss::RangeIntLin(G4PhysicsVector* physicsVector, |
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| 195 | G4int nbin) |
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| 196 | // num. integration, linear binning |
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| 197 | { |
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| 198 | G4double dtau,Value,taui,ti,lossi,ci; |
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| 199 | G4bool isOut; |
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| 200 | dtau = (tauhigh-taulow)/nbin; |
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| 201 | Value = 0.; |
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| 202 | |
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[1192] | 203 | for (G4int i=0; i<nbin; i++) |
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[819] | 204 | { |
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| 205 | taui = taulow + dtau*i ; |
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| 206 | ti = ParticleMass*taui; |
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| 207 | lossi = physicsVector->GetValue(ti,isOut); |
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| 208 | if(i==0) |
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| 209 | ci=0.5; |
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| 210 | else |
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| 211 | { |
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[1192] | 212 | if(i<nbin-1) |
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[819] | 213 | ci=1.; |
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| 214 | else |
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| 215 | ci=0.5; |
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| 216 | } |
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| 217 | Value += ci/lossi; |
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| 218 | } |
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| 219 | Value *= ParticleMass*dtau; |
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| 220 | return Value; |
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| 221 | } |
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| 222 | |
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| 223 | // |
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| 224 | |
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| 225 | G4double G4VeLowEnergyLoss::RangeIntLog(G4PhysicsVector* physicsVector, |
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| 226 | G4int nbin) |
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| 227 | // num. integration, logarithmic binning |
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| 228 | { |
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| 229 | G4double ltt,dltau,Value,ui,taui,ti,lossi,ci; |
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| 230 | G4bool isOut; |
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| 231 | ltt = ltauhigh-ltaulow; |
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| 232 | dltau = ltt/nbin; |
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| 233 | Value = 0.; |
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| 234 | |
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[1192] | 235 | for (G4int i=0; i<nbin; i++) |
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[819] | 236 | { |
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| 237 | ui = ltaulow+dltau*i; |
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| 238 | taui = std::exp(ui); |
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| 239 | ti = ParticleMass*taui; |
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| 240 | lossi = physicsVector->GetValue(ti,isOut); |
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| 241 | if(i==0) |
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| 242 | ci=0.5; |
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| 243 | else |
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| 244 | { |
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[1192] | 245 | if(i<nbin-1) |
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[819] | 246 | ci=1.; |
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| 247 | else |
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| 248 | ci=0.5; |
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| 249 | } |
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| 250 | Value += ci*taui/lossi; |
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| 251 | } |
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| 252 | Value *= ParticleMass*dltau; |
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| 253 | return Value; |
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| 254 | } |
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| 255 | |
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| 256 | |
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| 257 | // |
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| 258 | |
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| 259 | G4PhysicsTable* G4VeLowEnergyLoss::BuildLabTimeTable(G4PhysicsTable* theDEDXTable, |
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| 260 | G4PhysicsTable* theLabTimeTable, |
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| 261 | G4double lowestKineticEnergy, |
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| 262 | G4double highestKineticEnergy,G4int TotBin) |
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| 263 | |
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| 264 | { |
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| 265 | |
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| 266 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
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| 267 | |
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| 268 | if(theLabTimeTable) |
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| 269 | { theLabTimeTable->clearAndDestroy(); |
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| 270 | delete theLabTimeTable; } |
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| 271 | theLabTimeTable = new G4PhysicsTable(numOfCouples); |
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| 272 | |
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| 273 | |
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| 274 | for (G4int J=0; J<numOfCouples; J++) |
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| 275 | { |
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| 276 | G4PhysicsLogVector* aVector; |
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| 277 | |
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| 278 | aVector = new G4PhysicsLogVector(lowestKineticEnergy, |
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| 279 | highestKineticEnergy,TotBin); |
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| 280 | |
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| 281 | BuildLabTimeVector(theDEDXTable, |
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| 282 | lowestKineticEnergy,highestKineticEnergy,TotBin,J,aVector); |
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| 283 | theLabTimeTable->insert(aVector); |
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| 284 | |
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| 285 | |
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| 286 | } |
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| 287 | return theLabTimeTable ; |
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| 288 | } |
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| 289 | |
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| 290 | // |
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| 291 | |
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| 292 | G4PhysicsTable* G4VeLowEnergyLoss::BuildProperTimeTable(G4PhysicsTable* theDEDXTable, |
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| 293 | G4PhysicsTable* theProperTimeTable, |
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| 294 | G4double lowestKineticEnergy, |
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| 295 | G4double highestKineticEnergy,G4int TotBin) |
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| 296 | |
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| 297 | { |
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| 298 | |
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| 299 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
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| 300 | |
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| 301 | if(theProperTimeTable) |
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| 302 | { theProperTimeTable->clearAndDestroy(); |
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| 303 | delete theProperTimeTable; } |
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| 304 | theProperTimeTable = new G4PhysicsTable(numOfCouples); |
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| 305 | |
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| 306 | |
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| 307 | for (G4int J=0; J<numOfCouples; J++) |
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| 308 | { |
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| 309 | G4PhysicsLogVector* aVector; |
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| 310 | |
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| 311 | aVector = new G4PhysicsLogVector(lowestKineticEnergy, |
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| 312 | highestKineticEnergy,TotBin); |
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| 313 | |
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| 314 | BuildProperTimeVector(theDEDXTable, |
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| 315 | lowestKineticEnergy,highestKineticEnergy,TotBin,J,aVector); |
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| 316 | theProperTimeTable->insert(aVector); |
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| 317 | |
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| 318 | |
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| 319 | } |
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| 320 | return theProperTimeTable ; |
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| 321 | } |
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| 322 | |
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| 323 | // |
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| 324 | |
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| 325 | void G4VeLowEnergyLoss::BuildLabTimeVector(G4PhysicsTable* theDEDXTable, |
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| 326 | G4double, // lowestKineticEnergy |
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| 327 | G4double highestKineticEnergy, G4int TotBin, |
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| 328 | G4int materialIndex, G4PhysicsLogVector* timeVector) |
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| 329 | // create lab time vector for a material |
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| 330 | { |
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| 331 | |
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| 332 | G4int nbin=100; |
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| 333 | G4bool isOut; |
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| 334 | G4double tlim=5.*keV,parlowen=0.4,ppar=0.5-parlowen ; |
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| 335 | G4double losslim,clim,taulim,timelim,ltaulim,ltaumax, |
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| 336 | LowEdgeEnergy,tau,Value ; |
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| 337 | |
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| 338 | G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex]; |
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| 339 | |
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| 340 | // low energy part first... |
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| 341 | losslim = physicsVector->GetValue(tlim,isOut); |
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| 342 | taulim=tlim/ParticleMass ; |
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| 343 | clim=std::sqrt(ParticleMass*tlim/2.)/(c_light*losslim*ppar) ; |
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| 344 | ltaulim = std::log(taulim); |
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| 345 | ltaumax = std::log(highestKineticEnergy/ParticleMass) ; |
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| 346 | |
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| 347 | G4int i=-1; |
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| 348 | G4double oldValue = 0. ; |
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| 349 | G4double tauold ; |
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| 350 | do |
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| 351 | { |
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| 352 | i += 1 ; |
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| 353 | LowEdgeEnergy = timeVector->GetLowEdgeEnergy(i); |
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| 354 | tau = LowEdgeEnergy/ParticleMass ; |
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| 355 | if ( tau <= taulim ) |
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| 356 | { |
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| 357 | Value = clim*std::exp(ppar*std::log(tau/taulim)) ; |
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| 358 | } |
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| 359 | else |
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| 360 | { |
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| 361 | timelim=clim ; |
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| 362 | ltaulow = std::log(taulim); |
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| 363 | ltauhigh = std::log(tau); |
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| 364 | Value = timelim+LabTimeIntLog(physicsVector,nbin); |
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| 365 | } |
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| 366 | timeVector->PutValue(i,Value); |
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| 367 | oldValue = Value ; |
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| 368 | tauold = tau ; |
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| 369 | } while (tau<=taulim) ; |
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| 370 | i += 1 ; |
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[1192] | 371 | for (G4int j=i; j<=TotBin; j++) |
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[819] | 372 | { |
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| 373 | LowEdgeEnergy = timeVector->GetLowEdgeEnergy(j); |
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| 374 | tau = LowEdgeEnergy/ParticleMass ; |
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| 375 | ltaulow = std::log(tauold); |
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| 376 | ltauhigh = std::log(tau); |
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| 377 | Value = oldValue+LabTimeIntLog(physicsVector,nbin); |
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| 378 | timeVector->PutValue(j,Value); |
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| 379 | oldValue = Value ; |
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| 380 | tauold = tau ; |
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| 381 | } |
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| 382 | } |
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| 383 | |
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| 384 | // |
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| 385 | |
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| 386 | void G4VeLowEnergyLoss::BuildProperTimeVector(G4PhysicsTable* theDEDXTable, |
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| 387 | G4double, // lowestKineticEnergy |
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| 388 | G4double highestKineticEnergy, G4int TotBin, |
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| 389 | G4int materialIndex, G4PhysicsLogVector* timeVector) |
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| 390 | // create proper time vector for a material |
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| 391 | { |
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| 392 | G4int nbin=100; |
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| 393 | G4bool isOut; |
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| 394 | G4double tlim=5.*keV,parlowen=0.4,ppar=0.5-parlowen ; |
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| 395 | G4double losslim,clim,taulim,timelim,ltaulim,ltaumax, |
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| 396 | LowEdgeEnergy,tau,Value ; |
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| 397 | |
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| 398 | G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex]; |
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| 399 | //const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable(); |
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| 400 | |
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| 401 | // low energy part first... |
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| 402 | losslim = physicsVector->GetValue(tlim,isOut); |
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| 403 | taulim=tlim/ParticleMass ; |
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| 404 | clim=std::sqrt(ParticleMass*tlim/2.)/(c_light*losslim*ppar) ; |
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| 405 | ltaulim = std::log(taulim); |
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| 406 | ltaumax = std::log(highestKineticEnergy/ParticleMass) ; |
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| 407 | |
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| 408 | G4int i=-1; |
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| 409 | G4double oldValue = 0. ; |
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| 410 | G4double tauold ; |
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| 411 | do |
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| 412 | { |
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| 413 | i += 1 ; |
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| 414 | LowEdgeEnergy = timeVector->GetLowEdgeEnergy(i); |
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| 415 | tau = LowEdgeEnergy/ParticleMass ; |
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| 416 | if ( tau <= taulim ) |
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| 417 | { |
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| 418 | Value = clim*std::exp(ppar*std::log(tau/taulim)) ; |
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| 419 | } |
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| 420 | else |
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| 421 | { |
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| 422 | timelim=clim ; |
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| 423 | ltaulow = std::log(taulim); |
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| 424 | ltauhigh = std::log(tau); |
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| 425 | Value = timelim+ProperTimeIntLog(physicsVector,nbin); |
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| 426 | } |
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| 427 | timeVector->PutValue(i,Value); |
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| 428 | oldValue = Value ; |
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| 429 | tauold = tau ; |
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| 430 | } while (tau<=taulim) ; |
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| 431 | i += 1 ; |
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[1192] | 432 | for (G4int j=i; j<=TotBin; j++) |
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[819] | 433 | { |
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| 434 | LowEdgeEnergy = timeVector->GetLowEdgeEnergy(j); |
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| 435 | tau = LowEdgeEnergy/ParticleMass ; |
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| 436 | ltaulow = std::log(tauold); |
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| 437 | ltauhigh = std::log(tau); |
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| 438 | Value = oldValue+ProperTimeIntLog(physicsVector,nbin); |
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| 439 | timeVector->PutValue(j,Value); |
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| 440 | oldValue = Value ; |
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| 441 | tauold = tau ; |
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| 442 | } |
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| 443 | } |
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| 444 | |
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| 445 | // |
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| 446 | |
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| 447 | G4double G4VeLowEnergyLoss::LabTimeIntLog(G4PhysicsVector* physicsVector, |
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| 448 | G4int nbin) |
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| 449 | // num. integration, logarithmic binning |
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| 450 | { |
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| 451 | G4double ltt,dltau,Value,ui,taui,ti,lossi,ci; |
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| 452 | G4bool isOut; |
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| 453 | ltt = ltauhigh-ltaulow; |
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| 454 | dltau = ltt/nbin; |
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| 455 | Value = 0.; |
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| 456 | |
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[1192] | 457 | for (G4int i=0; i<nbin; i++) |
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[819] | 458 | { |
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| 459 | ui = ltaulow+dltau*i; |
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| 460 | taui = std::exp(ui); |
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| 461 | ti = ParticleMass*taui; |
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| 462 | lossi = physicsVector->GetValue(ti,isOut); |
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| 463 | if(i==0) |
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| 464 | ci=0.5; |
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| 465 | else |
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| 466 | { |
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[1192] | 467 | if(i<nbin-1) |
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[819] | 468 | ci=1.; |
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| 469 | else |
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| 470 | ci=0.5; |
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| 471 | } |
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| 472 | Value += ci*taui*(ti+ParticleMass)/(std::sqrt(ti*(ti+2.*ParticleMass))*lossi); |
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| 473 | } |
---|
| 474 | Value *= ParticleMass*dltau/c_light; |
---|
| 475 | return Value; |
---|
| 476 | } |
---|
| 477 | |
---|
| 478 | // |
---|
| 479 | |
---|
| 480 | G4double G4VeLowEnergyLoss::ProperTimeIntLog(G4PhysicsVector* physicsVector, |
---|
| 481 | G4int nbin) |
---|
| 482 | // num. integration, logarithmic binning |
---|
| 483 | { |
---|
| 484 | G4double ltt,dltau,Value,ui,taui,ti,lossi,ci; |
---|
| 485 | G4bool isOut; |
---|
| 486 | ltt = ltauhigh-ltaulow; |
---|
| 487 | dltau = ltt/nbin; |
---|
| 488 | Value = 0.; |
---|
| 489 | |
---|
[1192] | 490 | for (G4int i=0; i<nbin; i++) |
---|
[819] | 491 | { |
---|
| 492 | ui = ltaulow+dltau*i; |
---|
| 493 | taui = std::exp(ui); |
---|
| 494 | ti = ParticleMass*taui; |
---|
| 495 | lossi = physicsVector->GetValue(ti,isOut); |
---|
| 496 | if(i==0) |
---|
| 497 | ci=0.5; |
---|
| 498 | else |
---|
| 499 | { |
---|
[1192] | 500 | if(i<nbin-1) |
---|
[819] | 501 | ci=1.; |
---|
| 502 | else |
---|
| 503 | ci=0.5; |
---|
| 504 | } |
---|
| 505 | Value += ci*taui*ParticleMass/(std::sqrt(ti*(ti+2.*ParticleMass))*lossi); |
---|
| 506 | } |
---|
| 507 | Value *= ParticleMass*dltau/c_light; |
---|
| 508 | return Value; |
---|
| 509 | } |
---|
| 510 | |
---|
| 511 | // |
---|
| 512 | |
---|
| 513 | G4PhysicsTable* G4VeLowEnergyLoss::BuildInverseRangeTable(G4PhysicsTable* theRangeTable, |
---|
| 514 | G4PhysicsTable*, |
---|
| 515 | G4PhysicsTable*, |
---|
| 516 | G4PhysicsTable*, |
---|
| 517 | G4PhysicsTable* theInverseRangeTable, |
---|
| 518 | G4double, // lowestKineticEnergy, |
---|
| 519 | G4double, // highestKineticEnergy |
---|
| 520 | G4int ) // nbins |
---|
| 521 | // Build inverse table of the range table |
---|
| 522 | { |
---|
| 523 | G4bool b; |
---|
| 524 | |
---|
| 525 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
---|
| 526 | |
---|
| 527 | if(theInverseRangeTable) |
---|
| 528 | { theInverseRangeTable->clearAndDestroy(); |
---|
| 529 | delete theInverseRangeTable; } |
---|
| 530 | theInverseRangeTable = new G4PhysicsTable(numOfCouples); |
---|
| 531 | |
---|
| 532 | // loop for materials |
---|
| 533 | for (G4int i=0; i<numOfCouples; i++) |
---|
| 534 | { |
---|
| 535 | |
---|
| 536 | G4PhysicsVector* pv = (*theRangeTable)[i]; |
---|
| 537 | size_t nbins = pv->GetVectorLength(); |
---|
| 538 | G4double elow = pv->GetLowEdgeEnergy(0); |
---|
| 539 | G4double ehigh = pv->GetLowEdgeEnergy(nbins-1); |
---|
| 540 | G4double rlow = pv->GetValue(elow, b); |
---|
| 541 | G4double rhigh = pv->GetValue(ehigh, b); |
---|
| 542 | |
---|
[1192] | 543 | //rhigh *= std::exp(std::log(rhigh/rlow)/((G4double)(nbins-1))); |
---|
[819] | 544 | |
---|
[1192] | 545 | G4PhysicsLogVector* v = new G4PhysicsLogVector(rlow, rhigh, nbins-1); |
---|
[819] | 546 | |
---|
| 547 | v->PutValue(0,elow); |
---|
| 548 | G4double energy1 = elow; |
---|
| 549 | G4double range1 = rlow; |
---|
| 550 | G4double energy2 = elow; |
---|
| 551 | G4double range2 = rlow; |
---|
| 552 | size_t ilow = 0; |
---|
| 553 | size_t ihigh; |
---|
| 554 | |
---|
| 555 | for (size_t j=1; j<nbins; j++) { |
---|
| 556 | |
---|
| 557 | G4double range = v->GetLowEdgeEnergy(j); |
---|
| 558 | |
---|
| 559 | for (ihigh=ilow+1; ihigh<nbins; ihigh++) { |
---|
| 560 | energy2 = pv->GetLowEdgeEnergy(ihigh); |
---|
| 561 | range2 = pv->GetValue(energy2, b); |
---|
| 562 | if(range2 >= range || ihigh == nbins-1) { |
---|
| 563 | ilow = ihigh - 1; |
---|
| 564 | energy1 = pv->GetLowEdgeEnergy(ilow); |
---|
| 565 | range1 = pv->GetValue(energy1, b); |
---|
| 566 | break; |
---|
| 567 | } |
---|
| 568 | } |
---|
| 569 | |
---|
| 570 | G4double e = std::log(energy1) + std::log(energy2/energy1)*std::log(range/range1)/std::log(range2/range1); |
---|
| 571 | |
---|
| 572 | v->PutValue(j,std::exp(e)); |
---|
| 573 | } |
---|
| 574 | theInverseRangeTable->insert(v); |
---|
| 575 | |
---|
| 576 | } |
---|
| 577 | return theInverseRangeTable ; |
---|
| 578 | } |
---|
| 579 | |
---|
| 580 | // |
---|
| 581 | |
---|
| 582 | void G4VeLowEnergyLoss::InvertRangeVector(G4PhysicsTable* theRangeTable, |
---|
| 583 | G4PhysicsTable* theRangeCoeffATable, |
---|
| 584 | G4PhysicsTable* theRangeCoeffBTable, |
---|
| 585 | G4PhysicsTable* theRangeCoeffCTable, |
---|
| 586 | G4double lowestKineticEnergy, |
---|
| 587 | G4double highestKineticEnergy, G4int TotBin, |
---|
| 588 | G4int materialIndex, G4PhysicsLogVector* aVector) |
---|
| 589 | // invert range vector for a material |
---|
| 590 | { |
---|
| 591 | G4double LowEdgeRange,A,B,C,discr,KineticEnergy ; |
---|
| 592 | G4double RTable = std::exp(std::log(highestKineticEnergy/lowestKineticEnergy)/TotBin) ; |
---|
| 593 | G4double Tbin = lowestKineticEnergy/RTable ; |
---|
| 594 | G4double rangebin = 0.0 ; |
---|
| 595 | G4int binnumber = -1 ; |
---|
| 596 | G4bool isOut ; |
---|
| 597 | |
---|
| 598 | //loop for range values |
---|
[1192] | 599 | for( G4int i=0; i<=TotBin; i++) |
---|
[819] | 600 | { |
---|
| 601 | LowEdgeRange = aVector->GetLowEdgeEnergy(i) ; //i.e. GetLowEdgeValue(i) |
---|
| 602 | if( rangebin < LowEdgeRange ) |
---|
| 603 | { |
---|
| 604 | do |
---|
| 605 | { |
---|
| 606 | binnumber += 1 ; |
---|
| 607 | Tbin *= RTable ; |
---|
| 608 | rangebin = (*theRangeTable)(materialIndex)->GetValue(Tbin,isOut) ; |
---|
| 609 | } |
---|
| 610 | while ((rangebin < LowEdgeRange) && (binnumber < TotBin )) ; |
---|
| 611 | } |
---|
| 612 | |
---|
| 613 | if(binnumber == 0) |
---|
| 614 | KineticEnergy = lowestKineticEnergy ; |
---|
[1192] | 615 | else if(binnumber == TotBin) |
---|
[819] | 616 | KineticEnergy = highestKineticEnergy ; |
---|
| 617 | else |
---|
| 618 | { |
---|
| 619 | A = (*(*theRangeCoeffATable)(materialIndex))(binnumber-1) ; |
---|
| 620 | B = (*(*theRangeCoeffBTable)(materialIndex))(binnumber-1) ; |
---|
| 621 | C = (*(*theRangeCoeffCTable)(materialIndex))(binnumber-1) ; |
---|
| 622 | if(A==0.) |
---|
| 623 | KineticEnergy = (LowEdgeRange -C )/B ; |
---|
| 624 | else |
---|
| 625 | { |
---|
| 626 | discr = B*B - 4.*A*(C-LowEdgeRange); |
---|
| 627 | discr = discr>0. ? std::sqrt(discr) : 0.; |
---|
| 628 | KineticEnergy = 0.5*(discr-B)/A ; |
---|
| 629 | } |
---|
| 630 | } |
---|
| 631 | |
---|
| 632 | aVector->PutValue(i,KineticEnergy) ; |
---|
| 633 | } |
---|
| 634 | } |
---|
| 635 | |
---|
| 636 | // |
---|
| 637 | |
---|
| 638 | G4PhysicsTable* G4VeLowEnergyLoss::BuildRangeCoeffATable(G4PhysicsTable* theRangeTable, |
---|
| 639 | G4PhysicsTable* theRangeCoeffATable, |
---|
| 640 | G4double lowestKineticEnergy, |
---|
| 641 | G4double highestKineticEnergy, G4int TotBin) |
---|
| 642 | // Build tables of coefficients for the energy loss calculation |
---|
| 643 | // create table for coefficients "A" |
---|
| 644 | { |
---|
| 645 | |
---|
| 646 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
---|
| 647 | |
---|
| 648 | if(theRangeCoeffATable) |
---|
| 649 | { theRangeCoeffATable->clearAndDestroy(); |
---|
| 650 | delete theRangeCoeffATable; } |
---|
| 651 | theRangeCoeffATable = new G4PhysicsTable(numOfCouples); |
---|
| 652 | |
---|
| 653 | G4double RTable = std::exp(std::log(highestKineticEnergy/lowestKineticEnergy)/TotBin) ; |
---|
| 654 | G4double R2 = RTable*RTable ; |
---|
| 655 | G4double R1 = RTable+1.; |
---|
| 656 | G4double w = R1*(RTable-1.)*(RTable-1.); |
---|
| 657 | G4double w1 = RTable/w , w2 = -RTable*R1/w , w3 = R2/w ; |
---|
| 658 | G4double Ti , Tim , Tip , Ri , Rim , Rip , Value ; |
---|
| 659 | G4bool isOut; |
---|
| 660 | |
---|
| 661 | // loop for materials |
---|
| 662 | for (G4int J=0; J<numOfCouples; J++) |
---|
| 663 | { |
---|
| 664 | G4int binmax=TotBin ; |
---|
| 665 | G4PhysicsLinearVector* aVector = |
---|
| 666 | new G4PhysicsLinearVector(0.,binmax, TotBin); |
---|
| 667 | Ti = lowestKineticEnergy ; |
---|
| 668 | G4PhysicsVector* rangeVector= (*theRangeTable)[J]; |
---|
| 669 | |
---|
[1192] | 670 | for ( G4int i=0; i<=TotBin; i++) |
---|
[819] | 671 | { |
---|
| 672 | Ri = rangeVector->GetValue(Ti,isOut) ; |
---|
| 673 | if ( i==0 ) |
---|
| 674 | Rim = 0. ; |
---|
| 675 | else |
---|
| 676 | { |
---|
| 677 | Tim = Ti/RTable ; |
---|
| 678 | Rim = rangeVector->GetValue(Tim,isOut); |
---|
| 679 | } |
---|
[1192] | 680 | if ( i==TotBin) |
---|
[819] | 681 | Rip = Ri ; |
---|
| 682 | else |
---|
| 683 | { |
---|
| 684 | Tip = Ti*RTable ; |
---|
| 685 | Rip = rangeVector->GetValue(Tip,isOut); |
---|
| 686 | } |
---|
| 687 | Value = (w1*Rip + w2*Ri + w3*Rim)/(Ti*Ti) ; |
---|
| 688 | |
---|
| 689 | aVector->PutValue(i,Value); |
---|
| 690 | Ti = RTable*Ti ; |
---|
| 691 | } |
---|
| 692 | |
---|
| 693 | theRangeCoeffATable->insert(aVector); |
---|
| 694 | } |
---|
| 695 | return theRangeCoeffATable ; |
---|
| 696 | } |
---|
| 697 | |
---|
| 698 | // |
---|
| 699 | |
---|
| 700 | G4PhysicsTable* G4VeLowEnergyLoss::BuildRangeCoeffBTable(G4PhysicsTable* theRangeTable, |
---|
| 701 | G4PhysicsTable* theRangeCoeffBTable, |
---|
| 702 | G4double lowestKineticEnergy, |
---|
| 703 | G4double highestKineticEnergy, G4int TotBin) |
---|
| 704 | // Build tables of coefficients for the energy loss calculation |
---|
| 705 | // create table for coefficients "B" |
---|
| 706 | { |
---|
| 707 | |
---|
| 708 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
---|
| 709 | |
---|
| 710 | if(theRangeCoeffBTable) |
---|
| 711 | { theRangeCoeffBTable->clearAndDestroy(); |
---|
| 712 | delete theRangeCoeffBTable; } |
---|
| 713 | theRangeCoeffBTable = new G4PhysicsTable(numOfCouples); |
---|
| 714 | |
---|
| 715 | G4double RTable = std::exp(std::log(highestKineticEnergy/lowestKineticEnergy)/TotBin) ; |
---|
| 716 | G4double R2 = RTable*RTable ; |
---|
| 717 | G4double R1 = RTable+1.; |
---|
| 718 | G4double w = R1*(RTable-1.)*(RTable-1.); |
---|
| 719 | G4double w1 = -R1/w , w2 = R1*(R2+1.)/w , w3 = -R2*R1/w ; |
---|
| 720 | G4double Ti , Tim , Tip , Ri , Rim , Rip , Value ; |
---|
| 721 | G4bool isOut; |
---|
| 722 | |
---|
| 723 | // loop for materials |
---|
| 724 | for (G4int J=0; J<numOfCouples; J++) |
---|
| 725 | { |
---|
| 726 | G4int binmax=TotBin ; |
---|
| 727 | G4PhysicsLinearVector* aVector = |
---|
| 728 | new G4PhysicsLinearVector(0.,binmax, TotBin); |
---|
| 729 | Ti = lowestKineticEnergy ; |
---|
| 730 | G4PhysicsVector* rangeVector= (*theRangeTable)[J]; |
---|
| 731 | |
---|
[1192] | 732 | for ( G4int i=0; i<=TotBin; i++) |
---|
[819] | 733 | { |
---|
| 734 | Ri = rangeVector->GetValue(Ti,isOut) ; |
---|
| 735 | if ( i==0 ) |
---|
| 736 | Rim = 0. ; |
---|
| 737 | else |
---|
| 738 | { |
---|
| 739 | Tim = Ti/RTable ; |
---|
| 740 | Rim = rangeVector->GetValue(Tim,isOut); |
---|
| 741 | } |
---|
[1192] | 742 | if ( i==TotBin) |
---|
[819] | 743 | Rip = Ri ; |
---|
| 744 | else |
---|
| 745 | { |
---|
| 746 | Tip = Ti*RTable ; |
---|
| 747 | Rip = rangeVector->GetValue(Tip,isOut); |
---|
| 748 | } |
---|
| 749 | Value = (w1*Rip + w2*Ri + w3*Rim)/Ti; |
---|
| 750 | |
---|
| 751 | aVector->PutValue(i,Value); |
---|
| 752 | Ti = RTable*Ti ; |
---|
| 753 | } |
---|
| 754 | theRangeCoeffBTable->insert(aVector); |
---|
| 755 | } |
---|
| 756 | return theRangeCoeffBTable ; |
---|
| 757 | } |
---|
| 758 | |
---|
| 759 | // |
---|
| 760 | |
---|
| 761 | G4PhysicsTable* G4VeLowEnergyLoss::BuildRangeCoeffCTable(G4PhysicsTable* theRangeTable, |
---|
| 762 | G4PhysicsTable* theRangeCoeffCTable, |
---|
| 763 | G4double lowestKineticEnergy, |
---|
| 764 | G4double highestKineticEnergy, G4int TotBin) |
---|
| 765 | // Build tables of coefficients for the energy loss calculation |
---|
| 766 | // create table for coefficients "C" |
---|
| 767 | { |
---|
| 768 | |
---|
| 769 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
---|
| 770 | |
---|
| 771 | if(theRangeCoeffCTable) |
---|
| 772 | { theRangeCoeffCTable->clearAndDestroy(); |
---|
| 773 | delete theRangeCoeffCTable; } |
---|
| 774 | theRangeCoeffCTable = new G4PhysicsTable(numOfCouples); |
---|
| 775 | |
---|
| 776 | G4double RTable = std::exp(std::log(highestKineticEnergy/lowestKineticEnergy)/TotBin) ; |
---|
| 777 | G4double R2 = RTable*RTable ; |
---|
| 778 | G4double R1 = RTable+1.; |
---|
| 779 | G4double w = R1*(RTable-1.)*(RTable-1.); |
---|
| 780 | G4double w1 = 1./w , w2 = -RTable*R1/w , w3 = RTable*R2/w ; |
---|
| 781 | G4double Ti , Tim , Tip , Ri , Rim , Rip , Value ; |
---|
| 782 | G4bool isOut; |
---|
| 783 | |
---|
| 784 | // loop for materials |
---|
| 785 | for (G4int J=0; J<numOfCouples; J++) |
---|
| 786 | { |
---|
| 787 | G4int binmax=TotBin ; |
---|
| 788 | G4PhysicsLinearVector* aVector = |
---|
| 789 | new G4PhysicsLinearVector(0.,binmax, TotBin); |
---|
| 790 | Ti = lowestKineticEnergy ; |
---|
| 791 | G4PhysicsVector* rangeVector= (*theRangeTable)[J]; |
---|
| 792 | |
---|
[1192] | 793 | for ( G4int i=0; i<=TotBin; i++) |
---|
[819] | 794 | { |
---|
| 795 | Ri = rangeVector->GetValue(Ti,isOut) ; |
---|
| 796 | if ( i==0 ) |
---|
| 797 | Rim = 0. ; |
---|
| 798 | else |
---|
| 799 | { |
---|
| 800 | Tim = Ti/RTable ; |
---|
| 801 | Rim = rangeVector->GetValue(Tim,isOut); |
---|
| 802 | } |
---|
[1192] | 803 | if ( i==TotBin) |
---|
[819] | 804 | Rip = Ri ; |
---|
| 805 | else |
---|
| 806 | { |
---|
| 807 | Tip = Ti*RTable ; |
---|
| 808 | Rip = rangeVector->GetValue(Tip,isOut); |
---|
| 809 | } |
---|
| 810 | Value = w1*Rip + w2*Ri + w3*Rim ; |
---|
| 811 | |
---|
| 812 | aVector->PutValue(i,Value); |
---|
| 813 | Ti = RTable*Ti ; |
---|
| 814 | } |
---|
| 815 | theRangeCoeffCTable->insert(aVector); |
---|
| 816 | } |
---|
| 817 | return theRangeCoeffCTable ; |
---|
| 818 | } |
---|
| 819 | |
---|
| 820 | // |
---|
| 821 | |
---|
| 822 | G4double G4VeLowEnergyLoss::GetLossWithFluct(const G4DynamicParticle* aParticle, |
---|
| 823 | const G4MaterialCutsCouple* couple, |
---|
| 824 | G4double MeanLoss, |
---|
| 825 | G4double step) |
---|
| 826 | // calculate actual loss from the mean loss |
---|
| 827 | // The model used to get the fluctuation is essentially the same as in Glandz in Geant3. |
---|
| 828 | { |
---|
| 829 | static const G4double minLoss = 1.*eV ; |
---|
| 830 | static const G4double probLim = 0.01 ; |
---|
| 831 | static const G4double sumaLim = -std::log(probLim) ; |
---|
| 832 | static const G4double alim=10.; |
---|
| 833 | static const G4double kappa = 10. ; |
---|
| 834 | static const G4double factor = twopi_mc2_rcl2 ; |
---|
| 835 | const G4Material* aMaterial = couple->GetMaterial(); |
---|
| 836 | |
---|
| 837 | // check if the material has changed ( cache mechanism) |
---|
| 838 | |
---|
| 839 | if (aMaterial != lastMaterial) |
---|
| 840 | { |
---|
| 841 | lastMaterial = aMaterial; |
---|
| 842 | imat = couple->GetIndex(); |
---|
| 843 | f1Fluct = aMaterial->GetIonisation()->GetF1fluct(); |
---|
| 844 | f2Fluct = aMaterial->GetIonisation()->GetF2fluct(); |
---|
| 845 | e1Fluct = aMaterial->GetIonisation()->GetEnergy1fluct(); |
---|
| 846 | e2Fluct = aMaterial->GetIonisation()->GetEnergy2fluct(); |
---|
| 847 | e1LogFluct = aMaterial->GetIonisation()->GetLogEnergy1fluct(); |
---|
| 848 | e2LogFluct = aMaterial->GetIonisation()->GetLogEnergy2fluct(); |
---|
| 849 | rateFluct = aMaterial->GetIonisation()->GetRateionexcfluct(); |
---|
| 850 | ipotFluct = aMaterial->GetIonisation()->GetMeanExcitationEnergy(); |
---|
| 851 | ipotLogFluct = aMaterial->GetIonisation()->GetLogMeanExcEnergy(); |
---|
| 852 | } |
---|
| 853 | G4double threshold,w1,w2,C, |
---|
| 854 | beta2,suma,e0,loss,lossc,w; |
---|
| 855 | G4double a1,a2,a3; |
---|
| 856 | G4int p1,p2,p3; |
---|
| 857 | G4int nb; |
---|
| 858 | G4double Corrfac, na,alfa,rfac,namean,sa,alfa1,ea,sea; |
---|
| 859 | // G4double dp1; |
---|
| 860 | G4double dp3; |
---|
| 861 | G4double siga ; |
---|
| 862 | |
---|
| 863 | // shortcut for very very small loss |
---|
| 864 | if(MeanLoss < minLoss) return MeanLoss ; |
---|
| 865 | |
---|
| 866 | // get particle data |
---|
| 867 | G4double Tkin = aParticle->GetKineticEnergy(); |
---|
| 868 | |
---|
| 869 | // G4cout << "MGP -- Fluc Tkin " << Tkin/keV << " keV " << " MeanLoss = " << MeanLoss/keV << G4endl; |
---|
| 870 | |
---|
| 871 | threshold = (*((G4ProductionCutsTable::GetProductionCutsTable()) |
---|
| 872 | ->GetEnergyCutsVector(1)))[imat]; |
---|
| 873 | G4double rmass = electron_mass_c2/ParticleMass; |
---|
| 874 | G4double tau = Tkin/ParticleMass, tau1 = tau+1., tau2 = tau*(tau+2.); |
---|
| 875 | G4double Tm = 2.*electron_mass_c2*tau2/(1.+2.*tau1*rmass+rmass*rmass); |
---|
| 876 | |
---|
| 877 | // G4cout << "MGP Particle mass " << ParticleMass/MeV << " Tm " << Tm << G4endl; |
---|
| 878 | |
---|
| 879 | if(Tm > threshold) Tm = threshold; |
---|
| 880 | beta2 = tau2/(tau1*tau1); |
---|
| 881 | |
---|
| 882 | // Gaussian fluctuation ? |
---|
| 883 | if(MeanLoss >= kappa*Tm || MeanLoss <= kappa*ipotFluct) |
---|
| 884 | { |
---|
| 885 | G4double electronDensity = aMaterial->GetElectronDensity() ; |
---|
| 886 | siga = std::sqrt(Tm*(1.0-0.5*beta2)*step* |
---|
| 887 | factor*electronDensity/beta2) ; |
---|
| 888 | do { |
---|
| 889 | loss = G4RandGauss::shoot(MeanLoss,siga) ; |
---|
| 890 | } while (loss < 0. || loss > 2.0*MeanLoss); |
---|
| 891 | return loss ; |
---|
| 892 | } |
---|
| 893 | |
---|
| 894 | w1 = Tm/ipotFluct; |
---|
| 895 | w2 = std::log(2.*electron_mass_c2*tau2); |
---|
| 896 | |
---|
| 897 | C = MeanLoss*(1.-rateFluct)/(w2-ipotLogFluct-beta2); |
---|
| 898 | |
---|
| 899 | a1 = C*f1Fluct*(w2-e1LogFluct-beta2)/e1Fluct; |
---|
| 900 | a2 = C*f2Fluct*(w2-e2LogFluct-beta2)/e2Fluct; |
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| 901 | a3 = rateFluct*MeanLoss*(Tm-ipotFluct)/(ipotFluct*Tm*std::log(w1)); |
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| 902 | |
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| 903 | suma = a1+a2+a3; |
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| 904 | |
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| 905 | loss = 0. ; |
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| 906 | |
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| 907 | if(suma < sumaLim) // very small Step |
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| 908 | { |
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| 909 | e0 = aMaterial->GetIonisation()->GetEnergy0fluct(); |
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| 910 | // G4cout << "MGP e0 = " << e0/keV << G4endl; |
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| 911 | |
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| 912 | if(Tm == ipotFluct) |
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| 913 | { |
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| 914 | a3 = MeanLoss/e0; |
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| 915 | |
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| 916 | if(a3>alim) |
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| 917 | { |
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| 918 | siga=std::sqrt(a3) ; |
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| 919 | p3 = std::max(0,G4int(G4RandGauss::shoot(a3,siga)+0.5)); |
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| 920 | } |
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| 921 | else p3 = G4Poisson(a3); |
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| 922 | |
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| 923 | loss = p3*e0 ; |
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| 924 | |
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| 925 | if(p3 > 0) loss += (1.-2.*G4UniformRand())*e0 ; |
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| 926 | // G4cout << "MGP very small step " << loss/keV << G4endl; |
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| 927 | } |
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| 928 | else |
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| 929 | { |
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| 930 | // G4cout << "MGP old Tm = " << Tm << " " << ipotFluct << " " << e0 << G4endl; |
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| 931 | Tm = Tm-ipotFluct+e0 ; |
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| 932 | |
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| 933 | // MGP ---- workaround to avoid log argument<0, TO BE CHECKED |
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| 934 | if (Tm <= 0.) |
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| 935 | { |
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| 936 | loss = MeanLoss; |
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| 937 | p3 = 0; |
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| 938 | // G4cout << "MGP correction loss = MeanLoss " << loss/keV << G4endl; |
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| 939 | } |
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| 940 | else |
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| 941 | { |
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| 942 | a3 = MeanLoss*(Tm-e0)/(Tm*e0*std::log(Tm/e0)); |
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| 943 | |
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| 944 | // G4cout << "MGP new Tm = " << Tm << " " << ipotFluct << " " << e0 << " a3= " << a3 << G4endl; |
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| 945 | |
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| 946 | if(a3>alim) |
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| 947 | { |
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| 948 | siga=std::sqrt(a3) ; |
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| 949 | p3 = std::max(0,G4int(G4RandGauss::shoot(a3,siga)+0.5)); |
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| 950 | } |
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| 951 | else |
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| 952 | p3 = G4Poisson(a3); |
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| 953 | //G4cout << "MGP p3 " << p3 << G4endl; |
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| 954 | |
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| 955 | } |
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| 956 | |
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| 957 | if(p3 > 0) |
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| 958 | { |
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| 959 | w = (Tm-e0)/Tm ; |
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| 960 | if(p3 > nmaxCont2) |
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| 961 | { |
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| 962 | // G4cout << "MGP dp3 " << dp3 << " p3 " << p3 << " " << nmaxCont2 << G4endl; |
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| 963 | dp3 = G4double(p3) ; |
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| 964 | Corrfac = dp3/G4double(nmaxCont2) ; |
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| 965 | p3 = nmaxCont2 ; |
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| 966 | } |
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| 967 | else |
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| 968 | Corrfac = 1. ; |
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| 969 | |
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| 970 | for(G4int i=0; i<p3; i++) loss += 1./(1.-w*G4UniformRand()) ; |
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| 971 | loss *= e0*Corrfac ; |
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| 972 | // G4cout << "MGP Corrfac = " << Corrfac << " e0 = " << e0/keV << " loss = " << loss/keV << G4endl; |
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| 973 | } |
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| 974 | } |
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| 975 | } |
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| 976 | |
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| 977 | else // not so small Step |
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| 978 | { |
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| 979 | // excitation type 1 |
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| 980 | if(a1>alim) |
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| 981 | { |
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| 982 | siga=std::sqrt(a1) ; |
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| 983 | p1 = std::max(0,int(G4RandGauss::shoot(a1,siga)+0.5)); |
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| 984 | } |
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| 985 | else |
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| 986 | p1 = G4Poisson(a1); |
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| 987 | |
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| 988 | // excitation type 2 |
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| 989 | if(a2>alim) |
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| 990 | { |
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| 991 | siga=std::sqrt(a2) ; |
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| 992 | p2 = std::max(0,int(G4RandGauss::shoot(a2,siga)+0.5)); |
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| 993 | } |
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| 994 | else |
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| 995 | p2 = G4Poisson(a2); |
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| 996 | |
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| 997 | loss = p1*e1Fluct+p2*e2Fluct; |
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| 998 | |
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| 999 | // smearing to avoid unphysical peaks |
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| 1000 | if(p2 > 0) |
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| 1001 | loss += (1.-2.*G4UniformRand())*e2Fluct; |
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| 1002 | else if (loss>0.) |
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| 1003 | loss += (1.-2.*G4UniformRand())*e1Fluct; |
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| 1004 | |
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| 1005 | // ionisation ....................................... |
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| 1006 | if(a3 > 0.) |
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| 1007 | { |
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| 1008 | if(a3>alim) |
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| 1009 | { |
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| 1010 | siga=std::sqrt(a3) ; |
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| 1011 | p3 = std::max(0,int(G4RandGauss::shoot(a3,siga)+0.5)); |
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| 1012 | } |
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| 1013 | else |
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| 1014 | p3 = G4Poisson(a3); |
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| 1015 | |
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| 1016 | lossc = 0.; |
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| 1017 | if(p3 > 0) |
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| 1018 | { |
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| 1019 | na = 0.; |
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| 1020 | alfa = 1.; |
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| 1021 | if (p3 > nmaxCont2) |
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| 1022 | { |
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| 1023 | dp3 = G4double(p3); |
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| 1024 | rfac = dp3/(G4double(nmaxCont2)+dp3); |
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| 1025 | namean = G4double(p3)*rfac; |
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| 1026 | sa = G4double(nmaxCont1)*rfac; |
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| 1027 | na = G4RandGauss::shoot(namean,sa); |
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| 1028 | if (na > 0.) |
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| 1029 | { |
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| 1030 | alfa = w1*G4double(nmaxCont2+p3)/(w1*G4double(nmaxCont2)+G4double(p3)); |
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| 1031 | alfa1 = alfa*std::log(alfa)/(alfa-1.); |
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| 1032 | ea = na*ipotFluct*alfa1; |
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| 1033 | sea = ipotFluct*std::sqrt(na*(alfa-alfa1*alfa1)); |
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| 1034 | lossc += G4RandGauss::shoot(ea,sea); |
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| 1035 | } |
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| 1036 | } |
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| 1037 | |
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| 1038 | nb = G4int(G4double(p3)-na); |
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| 1039 | if (nb > 0) |
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| 1040 | { |
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| 1041 | w2 = alfa*ipotFluct; |
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| 1042 | w = (Tm-w2)/Tm; |
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| 1043 | for (G4int k=0; k<nb; k++) lossc += w2/(1.-w*G4UniformRand()); |
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| 1044 | } |
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| 1045 | } |
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| 1046 | |
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| 1047 | loss += lossc; |
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| 1048 | } |
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| 1049 | } |
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| 1050 | |
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| 1051 | return loss ; |
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| 1052 | } |
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| 1053 | |
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| 1054 | // |
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| 1055 | |
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