[1347] | 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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| 27 | // $Id: G4Scintillation.cc,v 1.38 2010/12/15 07:39:26 gunter Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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| 29 | // |
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| 30 | //////////////////////////////////////////////////////////////////////// |
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| 31 | // Scintillation Light Class Implementation |
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| 32 | //////////////////////////////////////////////////////////////////////// |
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| 33 | // |
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| 34 | // File: G4Scintillation.cc |
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| 35 | // Description: RestDiscrete Process - Generation of Scintillation Photons |
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| 36 | // Version: 1.0 |
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| 37 | // Created: 1998-11-07 |
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| 38 | // Author: Peter Gumplinger |
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| 39 | // Updated: 2010-10-20 Allow the scintillation yield to be a function |
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| 40 | // of energy deposited by particle type |
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| 41 | // Thanks to Zach Hartwig (Department of Nuclear |
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| 42 | // Science and Engineeering - MIT) |
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| 43 | // 2010-09-22 by Peter Gumplinger |
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| 44 | // > scintillation rise time included, thanks to |
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| 45 | // > Martin Goettlich/DESY |
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| 46 | // 2005-08-17 by Peter Gumplinger |
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| 47 | // > change variable name MeanNumPhotons -> MeanNumberOfPhotons |
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| 48 | // 2005-07-28 by Peter Gumplinger |
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| 49 | // > add G4ProcessType to constructor |
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| 50 | // 2004-08-05 by Peter Gumplinger |
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| 51 | // > changed StronglyForced back to Forced in GetMeanLifeTime |
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| 52 | // 2002-11-21 by Peter Gumplinger |
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| 53 | // > change to use G4Poisson for small MeanNumberOfPhotons |
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| 54 | // 2002-11-07 by Peter Gumplinger |
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| 55 | // > now allow for fast and slow scintillation component |
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| 56 | // 2002-11-05 by Peter Gumplinger |
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| 57 | // > now use scintillation constants from G4Material |
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| 58 | // 2002-05-09 by Peter Gumplinger |
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| 59 | // > use only the PostStepPoint location for the origin of |
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| 60 | // scintillation photons when energy is lost to the medium |
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| 61 | // by a neutral particle |
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| 62 | // 2000-09-18 by Peter Gumplinger |
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| 63 | // > change: aSecondaryPosition=x0+rand*aStep.GetDeltaPosition(); |
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| 64 | // aSecondaryTrack->SetTouchable(0); |
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| 65 | // 2001-09-17, migration of Materials to pure STL (mma) |
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| 66 | // 2003-06-03, V.Ivanchenko fix compilation warnings |
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| 67 | // |
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| 68 | // mail: gum@triumf.ca |
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| 69 | // |
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| 70 | //////////////////////////////////////////////////////////////////////// |
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| 71 | |
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| 72 | #include "G4ios.hh" |
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| 73 | #include "G4ParticleTypes.hh" |
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| 74 | #include "G4EmProcessSubType.hh" |
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| 75 | |
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| 76 | #include "G4Scintillation.hh" |
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| 77 | |
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| 78 | ///////////////////////// |
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| 79 | // Class Implementation |
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| 80 | ///////////////////////// |
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| 81 | |
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| 82 | ////////////// |
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| 83 | // Operators |
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| 84 | ////////////// |
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| 85 | |
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| 86 | // G4Scintillation::operator=(const G4Scintillation &right) |
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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 | // Constructors |
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| 92 | ///////////////// |
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| 93 | |
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| 94 | G4Scintillation::G4Scintillation(const G4String& processName, |
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| 95 | G4ProcessType type) |
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| 96 | : G4VRestDiscreteProcess(processName, type) |
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| 97 | { |
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| 98 | SetProcessSubType(fScintillation); |
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| 99 | |
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| 100 | fTrackSecondariesFirst = false; |
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| 101 | fFiniteRiseTime = false; |
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| 102 | |
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| 103 | YieldFactor = 1.0; |
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| 104 | ExcitationRatio = 1.0; |
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| 105 | |
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| 106 | scintillationByParticleType = false; |
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| 107 | |
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| 108 | theFastIntegralTable = NULL; |
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| 109 | theSlowIntegralTable = NULL; |
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| 110 | |
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| 111 | if (verboseLevel>0) { |
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| 112 | G4cout << GetProcessName() << " is created " << G4endl; |
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| 113 | } |
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| 114 | |
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| 115 | BuildThePhysicsTable(); |
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| 116 | |
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| 117 | emSaturation = NULL; |
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| 118 | } |
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| 119 | |
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| 120 | //////////////// |
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| 121 | // Destructors |
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| 122 | //////////////// |
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| 123 | |
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| 124 | G4Scintillation::~G4Scintillation() |
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| 125 | { |
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| 126 | if (theFastIntegralTable != NULL) { |
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| 127 | theFastIntegralTable->clearAndDestroy(); |
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| 128 | delete theFastIntegralTable; |
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| 129 | } |
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| 130 | if (theSlowIntegralTable != NULL) { |
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| 131 | theSlowIntegralTable->clearAndDestroy(); |
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| 132 | delete theSlowIntegralTable; |
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| 133 | } |
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| 134 | } |
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| 135 | |
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| 136 | //////////// |
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| 137 | // Methods |
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| 138 | //////////// |
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| 139 | |
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| 140 | // AtRestDoIt |
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| 141 | // ---------- |
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| 142 | // |
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| 143 | G4VParticleChange* |
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| 144 | G4Scintillation::AtRestDoIt(const G4Track& aTrack, const G4Step& aStep) |
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| 145 | |
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| 146 | // This routine simply calls the equivalent PostStepDoIt since all the |
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| 147 | // necessary information resides in aStep.GetTotalEnergyDeposit() |
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| 148 | |
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| 149 | { |
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| 150 | return G4Scintillation::PostStepDoIt(aTrack, aStep); |
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| 151 | } |
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| 152 | |
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| 153 | // PostStepDoIt |
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| 154 | // ------------- |
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| 155 | // |
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| 156 | G4VParticleChange* |
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| 157 | G4Scintillation::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep) |
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| 158 | |
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| 159 | // This routine is called for each tracking step of a charged particle |
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| 160 | // in a scintillator. A Poisson/Gauss-distributed number of photons is |
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| 161 | // generated according to the scintillation yield formula, distributed |
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| 162 | // evenly along the track segment and uniformly into 4pi. |
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| 163 | |
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| 164 | { |
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| 165 | aParticleChange.Initialize(aTrack); |
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| 166 | |
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| 167 | const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle(); |
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| 168 | const G4Material* aMaterial = aTrack.GetMaterial(); |
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| 169 | |
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| 170 | G4StepPoint* pPreStepPoint = aStep.GetPreStepPoint(); |
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| 171 | G4StepPoint* pPostStepPoint = aStep.GetPostStepPoint(); |
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| 172 | |
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| 173 | G4ThreeVector x0 = pPreStepPoint->GetPosition(); |
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| 174 | G4ThreeVector p0 = aStep.GetDeltaPosition().unit(); |
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| 175 | G4double t0 = pPreStepPoint->GetGlobalTime(); |
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| 176 | |
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| 177 | G4double TotalEnergyDeposit = aStep.GetTotalEnergyDeposit(); |
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| 178 | |
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| 179 | G4MaterialPropertiesTable* aMaterialPropertiesTable = |
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| 180 | aMaterial->GetMaterialPropertiesTable(); |
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| 181 | if (!aMaterialPropertiesTable) |
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| 182 | return G4VRestDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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| 183 | |
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| 184 | const G4MaterialPropertyVector* Fast_Intensity = |
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| 185 | aMaterialPropertiesTable->GetProperty("FASTCOMPONENT"); |
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| 186 | const G4MaterialPropertyVector* Slow_Intensity = |
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| 187 | aMaterialPropertiesTable->GetProperty("SLOWCOMPONENT"); |
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| 188 | |
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| 189 | if (!Fast_Intensity && !Slow_Intensity ) |
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| 190 | return G4VRestDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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| 191 | |
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| 192 | G4int nscnt = 1; |
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| 193 | if (Fast_Intensity && Slow_Intensity) nscnt = 2; |
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| 194 | |
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| 195 | G4double ScintillationYield = 0.; |
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| 196 | |
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| 197 | if (scintillationByParticleType) { |
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| 198 | // The scintillation response is a function of the energy |
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| 199 | // deposited by particle types. |
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| 200 | |
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| 201 | // Get the definition of the current particle |
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| 202 | G4ParticleDefinition *pDef = aParticle->GetDefinition(); |
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| 203 | const G4MaterialPropertyVector *Scint_Yield_Vector = NULL; |
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| 204 | |
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| 205 | // Obtain the G4MaterialPropertyVectory containing the |
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| 206 | // scintillation light yield as a function of the deposited |
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| 207 | // energy for the current particle type |
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| 208 | |
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| 209 | // Protons |
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| 210 | if(pDef==G4Proton::ProtonDefinition()) |
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| 211 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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| 212 | GetProperty("PROTONSCINTILLATIONYIELD"); |
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| 213 | |
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| 214 | // Deuterons |
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| 215 | else if(pDef==G4Deuteron::DeuteronDefinition()) |
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| 216 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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| 217 | GetProperty("DEUTERONSCINTILLATIONYIELD"); |
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| 218 | |
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| 219 | // Tritons |
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| 220 | else if(pDef==G4Triton::TritonDefinition()) |
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| 221 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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| 222 | GetProperty("TRITONSCINTILLATIONYIELD"); |
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| 223 | |
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| 224 | // Alphas |
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| 225 | else if(pDef==G4Alpha::AlphaDefinition()) |
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| 226 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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| 227 | GetProperty("ALPHASCINTILLATIONYIELD"); |
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| 228 | |
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| 229 | // Ions (particles derived from G4VIon and G4Ions) |
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| 230 | // and recoil ions below tracking cut from neutrons after hElastic |
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| 231 | else if(pDef->GetParticleType()== "nucleus" || |
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| 232 | pDef==G4Neutron::NeutronDefinition()) |
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| 233 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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| 234 | GetProperty("IONSCINTILLATIONYIELD"); |
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| 235 | |
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| 236 | // Electrons (must also account for shell-binding energy |
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| 237 | // attributed to gamma from standard PhotoElectricEffect) |
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| 238 | else if(pDef==G4Electron::ElectronDefinition() || |
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| 239 | pDef==G4Gamma::GammaDefinition()) |
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| 240 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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| 241 | GetProperty("ELECTRONSCINTILLATIONYIELD"); |
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| 242 | |
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| 243 | // Default for particles not enumerated/listed above |
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| 244 | else |
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| 245 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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| 246 | GetProperty("ELECTRONSCINTILLATIONYIELD"); |
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| 247 | |
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| 248 | // If the user has not specified yields for (p,d,t,a,carbon) |
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| 249 | // then these unspecified particles will default to the |
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| 250 | // electron's scintillation yield |
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| 251 | if(!Scint_Yield_Vector){ |
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| 252 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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| 253 | GetProperty("ELECTRONSCINTILLATIONYIELD"); |
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| 254 | } |
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| 255 | |
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| 256 | // Throw an exception if no scintillation yield is found |
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| 257 | if (!Scint_Yield_Vector) { |
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| 258 | G4cerr << "\nG4Scintillation::PostStepDoIt(): " |
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| 259 | << "Request for scintillation yield for energy deposit and particle type without correct entry in MaterialPropertiesTable\n" |
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| 260 | << "ScintillationByParticleType requires at minimum that ELECTRONSCINTILLATIONYIELD is set by the user\n" |
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| 261 | << G4endl; |
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| 262 | G4Exception("G4Scintillation::PostStepDoIt", |
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| 263 | "No correct entry in MaterialPropertiesTable", |
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| 264 | FatalException,"Missing MaterialPropertiesTable entry."); |
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| 265 | } |
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| 266 | |
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| 267 | if (verboseLevel>1) { |
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| 268 | G4cout << "\n" |
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| 269 | << "Particle = " << pDef->GetParticleName() << "\n" |
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| 270 | << "Energy Dep. = " << TotalEnergyDeposit/MeV << "\n" |
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| 271 | << "Yield = " |
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| 272 | << Scint_Yield_Vector->GetProperty(TotalEnergyDeposit) |
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| 273 | << "\n" << G4endl; |
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| 274 | } |
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| 275 | |
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| 276 | // Obtain the scintillation yield using the total energy |
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| 277 | // deposited by the particle in this step. |
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| 278 | |
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| 279 | // Units: [# scintillation photons] |
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| 280 | ScintillationYield = Scint_Yield_Vector-> |
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| 281 | GetProperty(TotalEnergyDeposit); |
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| 282 | } else { |
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| 283 | // The default linear scintillation process |
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| 284 | ScintillationYield = aMaterialPropertiesTable-> |
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| 285 | GetConstProperty("SCINTILLATIONYIELD"); |
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| 286 | |
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| 287 | // Units: [# scintillation photons / MeV] |
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| 288 | ScintillationYield *= YieldFactor; |
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| 289 | } |
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| 290 | |
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| 291 | G4double ResolutionScale = aMaterialPropertiesTable-> |
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| 292 | GetConstProperty("RESOLUTIONSCALE"); |
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| 293 | |
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| 294 | // Birks law saturation: |
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| 295 | |
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| 296 | G4double constBirks = 0.0; |
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| 297 | |
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| 298 | constBirks = aMaterial->GetIonisation()->GetBirksConstant(); |
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| 299 | |
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| 300 | G4double MeanNumberOfPhotons; |
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| 301 | |
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| 302 | // Birk's correction via emSaturation and specifying scintillation by |
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| 303 | // by particle type are physically mutually exclusive |
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| 304 | |
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| 305 | if (scintillationByParticleType) |
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| 306 | MeanNumberOfPhotons = ScintillationYield; |
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| 307 | else if (emSaturation) |
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| 308 | MeanNumberOfPhotons = ScintillationYield* |
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| 309 | (emSaturation->VisibleEnergyDeposition(&aStep)); |
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| 310 | else |
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| 311 | MeanNumberOfPhotons = ScintillationYield*TotalEnergyDeposit; |
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| 312 | |
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| 313 | G4int NumPhotons; |
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| 314 | |
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| 315 | if (MeanNumberOfPhotons > 10.) |
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| 316 | { |
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| 317 | G4double sigma = ResolutionScale * std::sqrt(MeanNumberOfPhotons); |
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| 318 | NumPhotons = G4int(G4RandGauss::shoot(MeanNumberOfPhotons,sigma)+0.5); |
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| 319 | } |
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| 320 | else |
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| 321 | { |
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| 322 | NumPhotons = G4int(G4Poisson(MeanNumberOfPhotons)); |
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| 323 | } |
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| 324 | |
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| 325 | if (NumPhotons <= 0) |
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| 326 | { |
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| 327 | // return unchanged particle and no secondaries |
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| 328 | |
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| 329 | aParticleChange.SetNumberOfSecondaries(0); |
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| 330 | |
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| 331 | return G4VRestDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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| 332 | } |
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| 333 | |
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| 334 | //////////////////////////////////////////////////////////////// |
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| 335 | |
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| 336 | aParticleChange.SetNumberOfSecondaries(NumPhotons); |
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| 337 | |
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| 338 | if (fTrackSecondariesFirst) { |
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| 339 | if (aTrack.GetTrackStatus() == fAlive ) |
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| 340 | aParticleChange.ProposeTrackStatus(fSuspend); |
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| 341 | } |
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| 342 | |
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| 343 | //////////////////////////////////////////////////////////////// |
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| 344 | |
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| 345 | G4int materialIndex = aMaterial->GetIndex(); |
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| 346 | |
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| 347 | // Retrieve the Scintillation Integral for this material |
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| 348 | // new G4PhysicsOrderedFreeVector allocated to hold CII's |
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| 349 | |
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| 350 | G4int Num = NumPhotons; |
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| 351 | |
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| 352 | for (G4int scnt = 1; scnt <= nscnt; scnt++) { |
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| 353 | |
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| 354 | G4double ScintillationTime = 0.*ns; |
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| 355 | G4double ScintillationRiseTime = 0.*ns; |
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| 356 | G4PhysicsOrderedFreeVector* ScintillationIntegral = NULL; |
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| 357 | |
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| 358 | if (scnt == 1) { |
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| 359 | if (nscnt == 1) { |
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| 360 | if(Fast_Intensity){ |
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| 361 | ScintillationTime = aMaterialPropertiesTable-> |
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| 362 | GetConstProperty("FASTTIMECONSTANT"); |
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| 363 | if (fFiniteRiseTime) { |
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| 364 | ScintillationRiseTime = aMaterialPropertiesTable-> |
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| 365 | GetConstProperty("FASTSCINTILLATIONRISETIME"); |
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| 366 | } |
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| 367 | ScintillationIntegral = |
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| 368 | (G4PhysicsOrderedFreeVector*)((*theFastIntegralTable)(materialIndex)); |
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| 369 | } |
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| 370 | if(Slow_Intensity){ |
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| 371 | ScintillationTime = aMaterialPropertiesTable-> |
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| 372 | GetConstProperty("SLOWTIMECONSTANT"); |
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| 373 | if (fFiniteRiseTime) { |
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| 374 | ScintillationRiseTime = aMaterialPropertiesTable-> |
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| 375 | GetConstProperty("SLOWSCINTILLATIONRISETIME"); |
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| 376 | } |
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| 377 | ScintillationIntegral = |
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| 378 | (G4PhysicsOrderedFreeVector*)((*theSlowIntegralTable)(materialIndex)); |
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| 379 | } |
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| 380 | } |
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| 381 | else { |
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| 382 | G4double YieldRatio = aMaterialPropertiesTable-> |
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| 383 | GetConstProperty("YIELDRATIO"); |
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| 384 | if ( ExcitationRatio == 1.0 ) { |
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| 385 | Num = G4int (std::min(YieldRatio,1.0) * NumPhotons); |
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| 386 | } |
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| 387 | else { |
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| 388 | Num = G4int (std::min(ExcitationRatio,1.0) * NumPhotons); |
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| 389 | } |
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| 390 | ScintillationTime = aMaterialPropertiesTable-> |
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| 391 | GetConstProperty("FASTTIMECONSTANT"); |
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| 392 | if (fFiniteRiseTime) { |
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| 393 | ScintillationRiseTime = aMaterialPropertiesTable-> |
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| 394 | GetConstProperty("FASTSCINTILLATIONRISETIME"); |
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| 395 | } |
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| 396 | ScintillationIntegral = |
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| 397 | (G4PhysicsOrderedFreeVector*)((*theFastIntegralTable)(materialIndex)); |
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| 398 | } |
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| 399 | } |
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| 400 | else { |
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| 401 | Num = NumPhotons - Num; |
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| 402 | ScintillationTime = aMaterialPropertiesTable-> |
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| 403 | GetConstProperty("SLOWTIMECONSTANT"); |
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| 404 | if (fFiniteRiseTime) { |
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| 405 | ScintillationRiseTime = aMaterialPropertiesTable-> |
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| 406 | GetConstProperty("SLOWSCINTILLATIONRISETIME"); |
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| 407 | } |
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| 408 | ScintillationIntegral = |
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| 409 | (G4PhysicsOrderedFreeVector*)((*theSlowIntegralTable)(materialIndex)); |
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| 410 | } |
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| 411 | |
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| 412 | if (!ScintillationIntegral) continue; |
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| 413 | |
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| 414 | // Max Scintillation Integral |
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| 415 | |
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| 416 | G4double CIImax = ScintillationIntegral->GetMaxValue(); |
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| 417 | |
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| 418 | for (G4int i = 0; i < Num; i++) { |
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| 419 | |
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| 420 | // Determine photon energy |
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| 421 | |
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| 422 | G4double CIIvalue = G4UniformRand()*CIImax; |
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| 423 | G4double sampledEnergy = |
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| 424 | ScintillationIntegral->GetEnergy(CIIvalue); |
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| 425 | |
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| 426 | if (verboseLevel>1) { |
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| 427 | G4cout << "sampledEnergy = " << sampledEnergy << G4endl; |
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| 428 | G4cout << "CIIvalue = " << CIIvalue << G4endl; |
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| 429 | } |
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| 430 | |
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| 431 | // Generate random photon direction |
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| 432 | |
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| 433 | G4double cost = 1. - 2.*G4UniformRand(); |
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| 434 | G4double sint = std::sqrt((1.-cost)*(1.+cost)); |
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| 435 | |
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| 436 | G4double phi = twopi*G4UniformRand(); |
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| 437 | G4double sinp = std::sin(phi); |
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| 438 | G4double cosp = std::cos(phi); |
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| 439 | |
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| 440 | G4double px = sint*cosp; |
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| 441 | G4double py = sint*sinp; |
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| 442 | G4double pz = cost; |
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| 443 | |
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| 444 | // Create photon momentum direction vector |
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| 445 | |
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| 446 | G4ParticleMomentum photonMomentum(px, py, pz); |
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| 447 | |
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| 448 | // Determine polarization of new photon |
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| 449 | |
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| 450 | G4double sx = cost*cosp; |
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| 451 | G4double sy = cost*sinp; |
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| 452 | G4double sz = -sint; |
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| 453 | |
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| 454 | G4ThreeVector photonPolarization(sx, sy, sz); |
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| 455 | |
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| 456 | G4ThreeVector perp = photonMomentum.cross(photonPolarization); |
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| 457 | |
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| 458 | phi = twopi*G4UniformRand(); |
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| 459 | sinp = std::sin(phi); |
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| 460 | cosp = std::cos(phi); |
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| 461 | |
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| 462 | photonPolarization = cosp * photonPolarization + sinp * perp; |
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| 463 | |
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| 464 | photonPolarization = photonPolarization.unit(); |
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| 465 | |
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| 466 | // Generate a new photon: |
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| 467 | |
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| 468 | G4DynamicParticle* aScintillationPhoton = |
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| 469 | new G4DynamicParticle(G4OpticalPhoton::OpticalPhoton(), |
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| 470 | photonMomentum); |
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| 471 | aScintillationPhoton->SetPolarization |
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| 472 | (photonPolarization.x(), |
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| 473 | photonPolarization.y(), |
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| 474 | photonPolarization.z()); |
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| 475 | |
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| 476 | aScintillationPhoton->SetKineticEnergy(sampledEnergy); |
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| 477 | |
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| 478 | // Generate new G4Track object: |
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| 479 | |
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| 480 | G4double rand; |
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| 481 | |
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| 482 | if (aParticle->GetDefinition()->GetPDGCharge() != 0) { |
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| 483 | rand = G4UniformRand(); |
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| 484 | } else { |
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| 485 | rand = 1.0; |
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| 486 | } |
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| 487 | |
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| 488 | G4double delta = rand * aStep.GetStepLength(); |
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| 489 | G4double deltaTime = delta / |
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| 490 | ((pPreStepPoint->GetVelocity()+ |
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| 491 | pPostStepPoint->GetVelocity())/2.); |
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| 492 | |
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| 493 | // emission time distribution |
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| 494 | if (ScintillationRiseTime==0.0) { |
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| 495 | deltaTime = deltaTime - |
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| 496 | ScintillationTime * std::log( G4UniformRand() ); |
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| 497 | } else { |
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| 498 | deltaTime = deltaTime + |
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| 499 | sample_time(ScintillationRiseTime, ScintillationTime); |
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| 500 | } |
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| 501 | |
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| 502 | G4double aSecondaryTime = t0 + deltaTime; |
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| 503 | |
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| 504 | G4ThreeVector aSecondaryPosition = |
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| 505 | x0 + rand * aStep.GetDeltaPosition(); |
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| 506 | |
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| 507 | G4Track* aSecondaryTrack = |
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| 508 | new G4Track(aScintillationPhoton,aSecondaryTime,aSecondaryPosition); |
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| 509 | |
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| 510 | aSecondaryTrack->SetTouchableHandle( |
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| 511 | aStep.GetPreStepPoint()->GetTouchableHandle()); |
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| 512 | // aSecondaryTrack->SetTouchableHandle((G4VTouchable*)0); |
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| 513 | |
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| 514 | aSecondaryTrack->SetParentID(aTrack.GetTrackID()); |
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| 515 | |
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| 516 | aParticleChange.AddSecondary(aSecondaryTrack); |
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| 517 | |
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| 518 | } |
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| 519 | } |
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| 520 | |
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| 521 | if (verboseLevel>0) { |
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| 522 | G4cout << "\n Exiting from G4Scintillation::DoIt -- NumberOfSecondaries = " |
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| 523 | << aParticleChange.GetNumberOfSecondaries() << G4endl; |
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| 524 | } |
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| 525 | |
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| 526 | return G4VRestDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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| 527 | } |
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| 528 | |
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| 529 | // BuildThePhysicsTable for the scintillation process |
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| 530 | // -------------------------------------------------- |
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| 531 | // |
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| 532 | |
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| 533 | void G4Scintillation::BuildThePhysicsTable() |
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| 534 | { |
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| 535 | if (theFastIntegralTable && theSlowIntegralTable) return; |
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| 536 | |
---|
| 537 | const G4MaterialTable* theMaterialTable = |
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| 538 | G4Material::GetMaterialTable(); |
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| 539 | G4int numOfMaterials = G4Material::GetNumberOfMaterials(); |
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| 540 | |
---|
| 541 | // create new physics table |
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| 542 | |
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| 543 | if(!theFastIntegralTable)theFastIntegralTable = new G4PhysicsTable(numOfMaterials); |
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| 544 | if(!theSlowIntegralTable)theSlowIntegralTable = new G4PhysicsTable(numOfMaterials); |
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| 545 | |
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| 546 | // loop for materials |
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| 547 | |
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| 548 | for (G4int i=0 ; i < numOfMaterials; i++) |
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| 549 | { |
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| 550 | G4PhysicsOrderedFreeVector* aPhysicsOrderedFreeVector = |
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| 551 | new G4PhysicsOrderedFreeVector(); |
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| 552 | G4PhysicsOrderedFreeVector* bPhysicsOrderedFreeVector = |
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| 553 | new G4PhysicsOrderedFreeVector(); |
---|
| 554 | |
---|
| 555 | // Retrieve vector of scintillation wavelength intensity for |
---|
| 556 | // the material from the material's optical properties table. |
---|
| 557 | |
---|
| 558 | G4Material* aMaterial = (*theMaterialTable)[i]; |
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| 559 | |
---|
| 560 | G4MaterialPropertiesTable* aMaterialPropertiesTable = |
---|
| 561 | aMaterial->GetMaterialPropertiesTable(); |
---|
| 562 | |
---|
| 563 | if (aMaterialPropertiesTable) { |
---|
| 564 | |
---|
| 565 | G4MaterialPropertyVector* theFastLightVector = |
---|
| 566 | aMaterialPropertiesTable->GetProperty("FASTCOMPONENT"); |
---|
| 567 | |
---|
| 568 | if (theFastLightVector) { |
---|
| 569 | |
---|
| 570 | // Retrieve the first intensity point in vector |
---|
| 571 | // of (photon energy, intensity) pairs |
---|
| 572 | |
---|
| 573 | theFastLightVector->ResetIterator(); |
---|
| 574 | ++(*theFastLightVector); // advance to 1st entry |
---|
| 575 | |
---|
| 576 | G4double currentIN = theFastLightVector-> |
---|
| 577 | GetProperty(); |
---|
| 578 | |
---|
| 579 | if (currentIN >= 0.0) { |
---|
| 580 | |
---|
| 581 | // Create first (photon energy, Scintillation |
---|
| 582 | // Integral pair |
---|
| 583 | |
---|
| 584 | G4double currentPM = theFastLightVector-> |
---|
| 585 | GetPhotonEnergy(); |
---|
| 586 | |
---|
| 587 | G4double currentCII = 0.0; |
---|
| 588 | |
---|
| 589 | aPhysicsOrderedFreeVector-> |
---|
| 590 | InsertValues(currentPM , currentCII); |
---|
| 591 | |
---|
| 592 | // Set previous values to current ones prior to loop |
---|
| 593 | |
---|
| 594 | G4double prevPM = currentPM; |
---|
| 595 | G4double prevCII = currentCII; |
---|
| 596 | G4double prevIN = currentIN; |
---|
| 597 | |
---|
| 598 | // loop over all (photon energy, intensity) |
---|
| 599 | // pairs stored for this material |
---|
| 600 | |
---|
| 601 | while(++(*theFastLightVector)) |
---|
| 602 | { |
---|
| 603 | currentPM = theFastLightVector-> |
---|
| 604 | GetPhotonEnergy(); |
---|
| 605 | |
---|
| 606 | currentIN = theFastLightVector-> |
---|
| 607 | GetProperty(); |
---|
| 608 | |
---|
| 609 | currentCII = 0.5 * (prevIN + currentIN); |
---|
| 610 | |
---|
| 611 | currentCII = prevCII + |
---|
| 612 | (currentPM - prevPM) * currentCII; |
---|
| 613 | |
---|
| 614 | aPhysicsOrderedFreeVector-> |
---|
| 615 | InsertValues(currentPM, currentCII); |
---|
| 616 | |
---|
| 617 | prevPM = currentPM; |
---|
| 618 | prevCII = currentCII; |
---|
| 619 | prevIN = currentIN; |
---|
| 620 | } |
---|
| 621 | |
---|
| 622 | } |
---|
| 623 | } |
---|
| 624 | |
---|
| 625 | G4MaterialPropertyVector* theSlowLightVector = |
---|
| 626 | aMaterialPropertiesTable->GetProperty("SLOWCOMPONENT"); |
---|
| 627 | |
---|
| 628 | if (theSlowLightVector) { |
---|
| 629 | |
---|
| 630 | // Retrieve the first intensity point in vector |
---|
| 631 | // of (photon energy, intensity) pairs |
---|
| 632 | |
---|
| 633 | theSlowLightVector->ResetIterator(); |
---|
| 634 | ++(*theSlowLightVector); // advance to 1st entry |
---|
| 635 | |
---|
| 636 | G4double currentIN = theSlowLightVector-> |
---|
| 637 | GetProperty(); |
---|
| 638 | |
---|
| 639 | if (currentIN >= 0.0) { |
---|
| 640 | |
---|
| 641 | // Create first (photon energy, Scintillation |
---|
| 642 | // Integral pair |
---|
| 643 | |
---|
| 644 | G4double currentPM = theSlowLightVector-> |
---|
| 645 | GetPhotonEnergy(); |
---|
| 646 | |
---|
| 647 | G4double currentCII = 0.0; |
---|
| 648 | |
---|
| 649 | bPhysicsOrderedFreeVector-> |
---|
| 650 | InsertValues(currentPM , currentCII); |
---|
| 651 | |
---|
| 652 | // Set previous values to current ones prior to loop |
---|
| 653 | |
---|
| 654 | G4double prevPM = currentPM; |
---|
| 655 | G4double prevCII = currentCII; |
---|
| 656 | G4double prevIN = currentIN; |
---|
| 657 | |
---|
| 658 | // loop over all (photon energy, intensity) |
---|
| 659 | // pairs stored for this material |
---|
| 660 | |
---|
| 661 | while(++(*theSlowLightVector)) |
---|
| 662 | { |
---|
| 663 | currentPM = theSlowLightVector-> |
---|
| 664 | GetPhotonEnergy(); |
---|
| 665 | |
---|
| 666 | currentIN=theSlowLightVector-> |
---|
| 667 | GetProperty(); |
---|
| 668 | |
---|
| 669 | currentCII = 0.5 * (prevIN + currentIN); |
---|
| 670 | |
---|
| 671 | currentCII = prevCII + |
---|
| 672 | (currentPM - prevPM) * currentCII; |
---|
| 673 | |
---|
| 674 | bPhysicsOrderedFreeVector-> |
---|
| 675 | InsertValues(currentPM, currentCII); |
---|
| 676 | |
---|
| 677 | prevPM = currentPM; |
---|
| 678 | prevCII = currentCII; |
---|
| 679 | prevIN = currentIN; |
---|
| 680 | } |
---|
| 681 | |
---|
| 682 | } |
---|
| 683 | } |
---|
| 684 | } |
---|
| 685 | |
---|
| 686 | // The scintillation integral(s) for a given material |
---|
| 687 | // will be inserted in the table(s) according to the |
---|
| 688 | // position of the material in the material table. |
---|
| 689 | |
---|
| 690 | theFastIntegralTable->insertAt(i,aPhysicsOrderedFreeVector); |
---|
| 691 | theSlowIntegralTable->insertAt(i,bPhysicsOrderedFreeVector); |
---|
| 692 | |
---|
| 693 | } |
---|
| 694 | } |
---|
| 695 | |
---|
| 696 | // Called by the user to set the scintillation yield as a function |
---|
| 697 | // of energy deposited by particle type |
---|
| 698 | |
---|
| 699 | void G4Scintillation::SetScintillationByParticleType(const G4bool scintType) |
---|
| 700 | { |
---|
| 701 | if (emSaturation) { |
---|
| 702 | G4Exception("G4Scintillation::SetScintillationByParticleType", "Redefinition", |
---|
| 703 | JustWarning, "Birks Saturation is replaced by ScintillationByParticleType!"); |
---|
| 704 | RemoveSaturation(); |
---|
| 705 | } |
---|
| 706 | scintillationByParticleType = scintType; |
---|
| 707 | } |
---|
| 708 | |
---|
| 709 | // GetMeanFreePath |
---|
| 710 | // --------------- |
---|
| 711 | // |
---|
| 712 | |
---|
| 713 | G4double G4Scintillation::GetMeanFreePath(const G4Track&, |
---|
| 714 | G4double , |
---|
| 715 | G4ForceCondition* condition) |
---|
| 716 | { |
---|
| 717 | *condition = StronglyForced; |
---|
| 718 | |
---|
| 719 | return DBL_MAX; |
---|
| 720 | |
---|
| 721 | } |
---|
| 722 | |
---|
| 723 | // GetMeanLifeTime |
---|
| 724 | // --------------- |
---|
| 725 | // |
---|
| 726 | |
---|
| 727 | G4double G4Scintillation::GetMeanLifeTime(const G4Track&, |
---|
| 728 | G4ForceCondition* condition) |
---|
| 729 | { |
---|
| 730 | *condition = Forced; |
---|
| 731 | |
---|
| 732 | return DBL_MAX; |
---|
| 733 | |
---|
| 734 | } |
---|
| 735 | |
---|
| 736 | G4double G4Scintillation::sample_time(G4double tau1, G4double tau2) |
---|
| 737 | { |
---|
| 738 | // tau1: rise time and tau2: decay time |
---|
| 739 | |
---|
| 740 | while(1) { |
---|
| 741 | // two random numbers |
---|
| 742 | G4double ran1 = G4UniformRand(); |
---|
| 743 | G4double ran2 = G4UniformRand(); |
---|
| 744 | // |
---|
| 745 | // exponential distribution as envelope function: very efficient |
---|
| 746 | // |
---|
| 747 | G4double d = (tau1+tau2)/tau2; |
---|
| 748 | // make sure the envelope function is |
---|
| 749 | // always larger than the bi-exponential |
---|
| 750 | G4double t = -1.0*tau2*std::log(1-ran1); |
---|
| 751 | G4double g = d*single_exp(t,tau2); |
---|
| 752 | if (ran2 <= bi_exp(t,tau1,tau2)/g) return t; |
---|
| 753 | } |
---|
| 754 | return -1.0; |
---|
| 755 | } |
---|