[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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| 27 | // $Id: G4SynchrotronRadiation.cc,v 1.5 2006/06/29 19:56:15 gunter Exp $ |
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| 28 | // GEANT4 tag $Name: $ |
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| 29 | // |
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| 30 | // -------------------------------------------------------------- |
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| 31 | // GEANT 4 class implementation file |
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| 32 | // CERN Geneva Switzerland |
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| 33 | // |
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| 34 | // History: first implementation, |
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| 35 | // 21-5-98 V.Grichine |
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| 36 | // 28-05-01, V.Ivanchenko minor changes to provide ANSI -wall compilation |
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| 37 | // 04.03.05, V.Grichine: get local field interface |
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| 38 | // 18-05-06 H. Burkhardt: Energy spectrum from function rather than table |
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| 39 | // |
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| 40 | // |
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| 41 | // |
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| 42 | // |
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| 43 | /////////////////////////////////////////////////////////////////////////// |
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| 44 | |
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| 45 | #include "G4SynchrotronRadiation.hh" |
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| 46 | // #include "G4Integrator.hh" |
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| 47 | #include "G4UnitsTable.hh" |
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| 48 | |
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| 49 | using namespace std; |
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| 50 | |
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| 51 | /////////////////////////////////////////////////////////////////////// |
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| 52 | // |
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| 53 | // Constructor |
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| 54 | // |
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| 55 | |
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| 56 | G4SynchrotronRadiation::G4SynchrotronRadiation(const G4String& processName, |
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| 57 | G4ProcessType type):G4VDiscreteProcess (processName, type), |
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| 58 | theGamma (G4Gamma::Gamma() ), |
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| 59 | theElectron ( G4Electron::Electron() ), |
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| 60 | thePositron ( G4Positron::Positron() ) |
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| 61 | { |
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| 62 | G4TransportationManager* transportMgr = |
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| 63 | G4TransportationManager::GetTransportationManager(); |
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| 64 | |
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| 65 | fFieldPropagator = transportMgr->GetPropagatorInField(); |
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| 66 | |
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| 67 | fLambdaConst = sqrt(3.0)*electron_mass_c2/ |
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| 68 | (2.5*fine_structure_const*eplus*c_light) ; |
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| 69 | fEnergyConst = 1.5*c_light*c_light*eplus*hbar_Planck/electron_mass_c2 ; |
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| 70 | verboseLevel=1; |
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| 71 | } |
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| 72 | |
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| 73 | ///////////////////////////////////////////////////////////////////////// |
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| 74 | // |
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| 75 | // Destructor |
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| 76 | // |
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| 77 | |
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| 78 | G4SynchrotronRadiation::~G4SynchrotronRadiation() |
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| 79 | { |
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| 80 | ; |
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| 81 | } |
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| 82 | |
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| 83 | /////////////////////////////// METHODS ///////////////////////////////// |
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| 84 | // |
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| 85 | // |
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| 86 | // Production of synchrotron X-ray photon |
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| 87 | // GEANT4 internal units. |
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| 88 | // |
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| 89 | |
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| 90 | |
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| 91 | G4double |
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| 92 | G4SynchrotronRadiation::GetMeanFreePath( const G4Track& trackData, |
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| 93 | G4double, |
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| 94 | G4ForceCondition* condition) |
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| 95 | { |
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| 96 | // gives the MeanFreePath in GEANT4 internal units |
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| 97 | G4double MeanFreePath; |
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| 98 | |
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| 99 | const G4DynamicParticle* aDynamicParticle = trackData.GetDynamicParticle(); |
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| 100 | |
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| 101 | *condition = NotForced ; |
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| 102 | |
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| 103 | G4double gamma = aDynamicParticle->GetTotalEnergy()/ |
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| 104 | aDynamicParticle->GetMass(); |
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| 105 | |
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| 106 | G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge(); |
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| 107 | |
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| 108 | if ( gamma < 1.0e3 ) MeanFreePath = DBL_MAX; |
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| 109 | else |
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| 110 | { |
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| 111 | |
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| 112 | G4ThreeVector FieldValue; |
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| 113 | const G4Field* pField = 0; |
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| 114 | |
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| 115 | G4FieldManager* fieldMgr=0; |
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| 116 | G4bool fieldExertsForce = false; |
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| 117 | |
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| 118 | if( (particleCharge != 0.0) ) |
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| 119 | { |
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| 120 | fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() ); |
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| 121 | |
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| 122 | if ( fieldMgr != 0 ) |
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| 123 | { |
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| 124 | // If the field manager has no field, there is no field ! |
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| 125 | |
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| 126 | fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 ); |
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| 127 | } |
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| 128 | } |
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| 129 | if ( fieldExertsForce ) |
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| 130 | { |
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| 131 | pField = fieldMgr->GetDetectorField() ; |
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| 132 | G4ThreeVector globPosition = trackData.GetPosition(); |
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| 133 | |
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| 134 | G4double globPosVec[3], FieldValueVec[3]; |
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| 135 | |
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| 136 | globPosVec[0] = globPosition.x(); |
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| 137 | globPosVec[1] = globPosition.y(); |
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| 138 | globPosVec[2] = globPosition.z(); |
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| 139 | |
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| 140 | pField->GetFieldValue( globPosVec, FieldValueVec ); |
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| 141 | |
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| 142 | FieldValue = G4ThreeVector( FieldValueVec[0], |
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| 143 | FieldValueVec[1], |
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| 144 | FieldValueVec[2] ); |
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| 145 | |
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| 146 | |
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| 147 | |
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| 148 | G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection(); |
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| 149 | G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum) ; |
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| 150 | G4double perpB = unitMcrossB.mag() ; |
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| 151 | |
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| 152 | if( perpB > 0.0 ) MeanFreePath = fLambdaConst/perpB; |
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| 153 | else MeanFreePath = DBL_MAX; |
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| 154 | |
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| 155 | static G4bool FirstTime=true; |
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| 156 | if(verboseLevel > 0 && FirstTime) |
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| 157 | { |
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| 158 | G4cout << "G4SynchrotronRadiation::GetMeanFreePath :" << '\n' << std::setprecision(4) |
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| 159 | << " MeanFreePath = " << G4BestUnit(MeanFreePath, "Length") |
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| 160 | << G4endl; |
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| 161 | if(verboseLevel > 1) |
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| 162 | { |
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| 163 | G4ThreeVector pvec=aDynamicParticle->GetMomentum(); |
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| 164 | G4double Btot=FieldValue.getR(); |
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| 165 | G4double ptot=pvec.getR(); |
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| 166 | G4double rho= ptot / (MeV * c_light * Btot ); // full bending radius |
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| 167 | G4double Theta=unitMomentum.theta(FieldValue); // angle between particle and field |
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| 168 | G4cout |
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| 169 | << " B = " << Btot/tesla << " Tesla" |
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| 170 | << " perpB = " << perpB/tesla << " Tesla" |
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| 171 | << " Theta = " << Theta << " sin(Theta)=" << sin(Theta) << '\n' |
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| 172 | << " ptot = " << G4BestUnit(ptot,"Energy") |
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| 173 | << " rho = " << G4BestUnit(rho,"Length") |
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| 174 | << G4endl; |
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| 175 | } |
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| 176 | FirstTime=false; |
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| 177 | } |
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| 178 | } |
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| 179 | else MeanFreePath = DBL_MAX; |
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| 180 | |
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| 181 | |
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| 182 | } |
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| 183 | |
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| 184 | return MeanFreePath; |
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| 185 | } |
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| 186 | |
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| 187 | //////////////////////////////////////////////////////////////////////////////// |
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| 188 | // |
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| 189 | // |
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| 190 | |
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| 191 | G4VParticleChange* |
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| 192 | G4SynchrotronRadiation::PostStepDoIt(const G4Track& trackData, |
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| 193 | const G4Step& stepData ) |
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| 194 | |
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| 195 | { |
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| 196 | aParticleChange.Initialize(trackData); |
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| 197 | |
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| 198 | const G4DynamicParticle* aDynamicParticle=trackData.GetDynamicParticle(); |
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| 199 | |
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| 200 | G4double gamma = aDynamicParticle->GetTotalEnergy()/ |
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| 201 | (aDynamicParticle->GetMass() ); |
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| 202 | |
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| 203 | if(gamma <= 1.0e3 ) |
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| 204 | { |
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| 205 | return G4VDiscreteProcess::PostStepDoIt(trackData,stepData); |
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| 206 | } |
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| 207 | G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge(); |
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| 208 | |
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| 209 | G4ThreeVector FieldValue; |
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| 210 | const G4Field* pField = 0 ; |
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| 211 | |
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| 212 | G4FieldManager* fieldMgr=0; |
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| 213 | G4bool fieldExertsForce = false; |
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| 214 | |
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| 215 | if( (particleCharge != 0.0) ) |
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| 216 | { |
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| 217 | fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() ); |
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| 218 | if ( fieldMgr != 0 ) |
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| 219 | { |
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| 220 | // If the field manager has no field, there is no field ! |
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| 221 | |
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| 222 | fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 ); |
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| 223 | } |
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| 224 | } |
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| 225 | if ( fieldExertsForce ) |
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| 226 | { |
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| 227 | pField = fieldMgr->GetDetectorField() ; |
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| 228 | G4ThreeVector globPosition = trackData.GetPosition() ; |
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| 229 | G4double globPosVec[3], FieldValueVec[3] ; |
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| 230 | globPosVec[0] = globPosition.x() ; |
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| 231 | globPosVec[1] = globPosition.y() ; |
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| 232 | globPosVec[2] = globPosition.z() ; |
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| 233 | |
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| 234 | pField->GetFieldValue( globPosVec, FieldValueVec ) ; |
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| 235 | FieldValue = G4ThreeVector( FieldValueVec[0], |
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| 236 | FieldValueVec[1], |
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| 237 | FieldValueVec[2] ); |
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| 238 | |
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| 239 | G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection(); |
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| 240 | G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum); |
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| 241 | G4double perpB = unitMcrossB.mag() ; |
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| 242 | if(perpB > 0.0) |
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| 243 | { |
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| 244 | // M-C of synchrotron photon energy |
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| 245 | |
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| 246 | G4double energyOfSR = GetRandomEnergySR(gamma,perpB); |
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| 247 | |
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| 248 | // check against insufficient energy |
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| 249 | |
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| 250 | if( energyOfSR <= 0.0 ) |
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| 251 | { |
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| 252 | return G4VDiscreteProcess::PostStepDoIt(trackData,stepData); |
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| 253 | } |
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| 254 | G4double kineticEnergy = aDynamicParticle->GetKineticEnergy(); |
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| 255 | G4ParticleMomentum |
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| 256 | particleDirection = aDynamicParticle->GetMomentumDirection(); |
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| 257 | |
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| 258 | // M-C of its direction |
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| 259 | |
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| 260 | G4double Teta = G4UniformRand()/gamma ; // Very roughly |
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| 261 | |
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| 262 | G4double Phi = twopi * G4UniformRand() ; |
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| 263 | |
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| 264 | G4double dirx = sin(Teta)*cos(Phi) , |
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| 265 | diry = sin(Teta)*sin(Phi) , |
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| 266 | dirz = cos(Teta) ; |
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| 267 | |
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| 268 | G4ThreeVector gammaDirection ( dirx, diry, dirz); |
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| 269 | gammaDirection.rotateUz(particleDirection); |
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| 270 | |
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| 271 | // polarization of new gamma |
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| 272 | |
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| 273 | // G4double sx = cos(Teta)*cos(Phi); |
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| 274 | // G4double sy = cos(Teta)*sin(Phi); |
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| 275 | // G4double sz = -sin(Teta); |
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| 276 | |
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| 277 | G4ThreeVector gammaPolarization = FieldValue.cross(gammaDirection); |
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| 278 | gammaPolarization = gammaPolarization.unit(); |
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| 279 | |
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| 280 | // (sx, sy, sz); |
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| 281 | // gammaPolarization.rotateUz(particleDirection); |
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| 282 | |
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| 283 | // create G4DynamicParticle object for the SR photon |
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| 284 | |
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| 285 | G4DynamicParticle* aGamma= new G4DynamicParticle ( theGamma, |
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| 286 | gammaDirection, |
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| 287 | energyOfSR ); |
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| 288 | aGamma->SetPolarization( gammaPolarization.x(), |
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| 289 | gammaPolarization.y(), |
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| 290 | gammaPolarization.z() ); |
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| 291 | |
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| 292 | |
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| 293 | aParticleChange.SetNumberOfSecondaries(1); |
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| 294 | aParticleChange.AddSecondary(aGamma); |
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| 295 | |
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| 296 | // Update the incident particle |
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| 297 | |
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| 298 | G4double newKinEnergy = kineticEnergy - energyOfSR ; |
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| 299 | aParticleChange.ProposeLocalEnergyDeposit (0.); |
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| 300 | |
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| 301 | if (newKinEnergy > 0.) |
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| 302 | { |
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| 303 | aParticleChange.ProposeMomentumDirection( particleDirection ); |
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| 304 | aParticleChange.ProposeEnergy( newKinEnergy ); |
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| 305 | } |
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| 306 | else |
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| 307 | { |
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| 308 | aParticleChange.ProposeEnergy( 0. ); |
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| 309 | } |
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| 310 | } |
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| 311 | } |
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| 312 | return G4VDiscreteProcess::PostStepDoIt(trackData,stepData); |
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| 313 | } |
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| 314 | |
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| 315 | |
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| 316 | ///////////////////////////////////////////////////////////////////////////////// |
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| 317 | // |
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| 318 | // |
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| 319 | |
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| 320 | G4double G4SynchrotronRadiation::InvSynFracInt(G4double x) |
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| 321 | // direct generation |
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| 322 | { |
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| 323 | // from 0 to 0.7 |
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| 324 | const G4double aa1=0 ,aa2=0.7; |
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| 325 | const G4int ncheb1=27; |
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| 326 | static const G4double cheb1[] = |
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| 327 | { 1.22371665676046468821,0.108956475422163837267,0.0383328524358594396134,0.00759138369340257753721, |
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| 328 | 0.00205712048644963340914,0.000497810783280019308661,0.000130743691810302187818,0.0000338168760220395409734, |
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| 329 | 8.97049680900520817728e-6,2.38685472794452241466e-6,6.41923109149104165049e-7,1.73549898982749277843e-7, |
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| 330 | 4.72145949240790029153e-8,1.29039866111999149636e-8,3.5422080787089834182e-9,9.7594757336403784905e-10, |
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| 331 | 2.6979510184976065731e-10,7.480422622550977077e-11,2.079598176402699913e-11,5.79533622220841193e-12, |
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| 332 | 1.61856011449276096e-12,4.529450993473807e-13,1.2698603951096606e-13,3.566117394511206e-14,1.00301587494091e-14, |
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| 333 | 2.82515346447219e-15,7.9680747949792e-16}; |
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| 334 | // from 0.7 to 0.9132260271183847 |
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| 335 | const G4double aa3=0.9132260271183847; |
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| 336 | const G4int ncheb2=27; |
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| 337 | static const G4double cheb2[] = |
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| 338 | { 1.1139496701107756,0.3523967429328067,0.0713849171926623,0.01475818043595387,0.003381255637322462, |
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| 339 | 0.0008228057599452224,0.00020785506681254216,0.00005390169253706556,0.000014250571923902464,3.823880733161044e-6, |
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| 340 | 1.0381966089136036e-6,2.8457557457837253e-7,7.86223332179956e-8,2.1866609342508474e-8,6.116186259857143e-9, |
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| 341 | 1.7191233618437565e-9,4.852755117740807e-10,1.3749966961763457e-10,3.908961987062447e-11,1.1146253766895824e-11, |
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| 342 | 3.1868887323415814e-12,9.134319791300977e-13,2.6211077371181566e-13,7.588643377757906e-14,2.1528376972619e-14, |
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| 343 | 6.030906040404772e-15,1.9549163926819867e-15}; |
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| 344 | // Chebyshev with exp/log scale |
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| 345 | // a = -Log[1 - SynFracInt[1]]; b = -Log[1 - SynFracInt[7]]; |
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| 346 | const G4double aa4=2.4444485538746025480,aa5=9.3830728608909477079; |
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| 347 | const G4int ncheb3=28; |
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| 348 | static const G4double cheb3[] = |
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| 349 | { 1.2292683840435586977,0.160353449247864455879,-0.0353559911947559448721,0.00776901561223573936985, |
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| 350 | -0.00165886451971685133259,0.000335719118906954279467,-0.0000617184951079161143187,9.23534039743246708256e-6, |
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| 351 | -6.06747198795168022842e-7,-3.07934045961999778094e-7,1.98818772614682367781e-7,-8.13909971567720135413e-8, |
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| 352 | 2.84298174969641838618e-8,-9.12829766621316063548e-9,2.77713868004820551077e-9,-8.13032767247834023165e-10, |
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| 353 | 2.31128525568385247392e-10,-6.41796873254200220876e-11,1.74815310473323361543e-11,-4.68653536933392363045e-12, |
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| 354 | 1.24016595805520752748e-12,-3.24839432979935522159e-13,8.44601465226513952994e-14,-2.18647276044246803998e-14, |
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| 355 | 5.65407548745690689978e-15,-1.46553625917463067508e-15,3.82059606377570462276e-16,-1.00457896653436912508e-16}; |
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| 356 | const G4double aa6=33.122936966163038145; |
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| 357 | const G4int ncheb4=27; |
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| 358 | static const G4double cheb4[] = |
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| 359 | {1.69342658227676741765,0.0742766400841232319225,-0.019337880608635717358,0.00516065527473364110491, |
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| 360 | -0.00139342012990307729473,0.000378549864052022522193,-0.000103167085583785340215,0.0000281543441271412178337, |
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| 361 | -7.68409742018258198651e-6,2.09543221890204537392e-6,-5.70493140367526282946e-7,1.54961164548564906446e-7, |
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| 362 | -4.19665599629607704794e-8,1.13239680054166507038e-8,-3.04223563379021441863e-9,8.13073745977562957997e-10, |
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| 363 | -2.15969415476814981374e-10,5.69472105972525594811e-11,-1.48844799572430829499e-11,3.84901514438304484973e-12, |
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| 364 | -9.82222575944247161834e-13,2.46468329208292208183e-13,-6.04953826265982691612e-14,1.44055805710671611984e-14, |
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| 365 | -3.28200813577388740722e-15,6.96566359173765367675e-16,-1.294122794852896275e-16}; |
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| 366 | |
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| 367 | if(x<aa2) return x*x*x*Chebyshev(aa1,aa2,cheb1,ncheb1,x); |
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| 368 | else if(x<aa3) return Chebyshev(aa2,aa3,cheb2,ncheb2,x); |
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| 369 | else if(x<1-0.0000841363) |
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| 370 | { G4double y=-log(1-x); |
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| 371 | return y*Chebyshev(aa4,aa5,cheb3,ncheb3,y); |
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| 372 | } |
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| 373 | else |
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| 374 | { G4double y=-log(1-x); |
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| 375 | return y*Chebyshev(aa5,aa6,cheb4,ncheb4,y); |
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| 376 | } |
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| 377 | } |
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| 378 | |
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| 379 | G4double G4SynchrotronRadiation::GetRandomEnergySR(G4double gamma, G4double perpB) |
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| 380 | { |
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| 381 | |
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| 382 | G4double Ecr=fEnergyConst*gamma*gamma*perpB; |
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| 383 | |
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| 384 | static G4bool FirstTime=true; |
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| 385 | if(verboseLevel > 0 && FirstTime) |
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| 386 | { G4double Emean=8./(15.*sqrt(3.))*Ecr; // mean photon energy |
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| 387 | G4double E_rms=sqrt(211./675.)*Ecr; // rms of photon energy distribution |
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| 388 | G4cout << "G4SynchrotronRadiation::GetRandomEnergySR :" << '\n' << std::setprecision(4) |
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| 389 | << " Ecr = " << G4BestUnit(Ecr,"Energy") << '\n' |
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| 390 | << " Emean = " << G4BestUnit(Emean,"Energy") << '\n' |
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| 391 | << " E_rms = " << G4BestUnit(E_rms,"Energy") << G4endl; |
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| 392 | FirstTime=false; |
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| 393 | } |
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| 394 | |
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| 395 | G4double energySR=Ecr*InvSynFracInt(G4UniformRand()); |
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| 396 | return energySR; |
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| 397 | } |
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| 398 | |
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| 399 | |
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| 400 | void G4SynchrotronRadiation::BuildPhysicsTable(const G4ParticleDefinition& part) |
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| 401 | { |
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| 402 | if(0 < verboseLevel && &part==theElectron ) PrintInfoDefinition(); |
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| 403 | } |
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| 404 | |
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| 405 | void G4SynchrotronRadiation::PrintInfoDefinition() // not yet called, usually called from BuildPhysicsTable |
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| 406 | { |
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| 407 | G4String comments ="Incoherent Synchrotron Radiation\n"; |
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| 408 | G4cout << G4endl << GetProcessName() << ": " << comments |
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| 409 | << " good description for long magnets at all energies" << G4endl; |
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| 410 | } |
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| 411 | |
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| 412 | ///////////////////// end of G4SynchrotronRadiation.cc |
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