[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: G4SynchrotronRadiationInMat.cc,v 1.2 2006/06/29 19:56:17 gunter Exp $ |
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[1007] | 28 | // GEANT4 tag $Name: geant4-09-02 $ |
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[819] | 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 | // 19-05-06, V.Ivanchenko rename from G4SynchrotronRadiation |
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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 | #include "G4SynchrotronRadiationInMat.hh" |
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| 44 | #include "G4Integrator.hh" |
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| 45 | |
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| 46 | using namespace std; |
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| 47 | |
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| 48 | //////////////////////////////////////////////////////////////////// |
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| 49 | // |
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| 50 | // Constant for calculation of mean free path |
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| 51 | // |
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| 52 | |
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| 53 | const G4double |
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| 54 | G4SynchrotronRadiationInMat::fLambdaConst = sqrt(3.0)*electron_mass_c2/ |
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| 55 | (2.5*fine_structure_const*eplus*c_light) ; |
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| 56 | |
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| 57 | ///////////////////////////////////////////////////////////////////// |
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| 58 | // |
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| 59 | // Constant for calculation of characterictic energy |
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| 60 | // |
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| 61 | |
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| 62 | const G4double |
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| 63 | G4SynchrotronRadiationInMat::fEnergyConst = 1.5*c_light*c_light*eplus*hbar_Planck/ |
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| 64 | electron_mass_c2 ; |
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| 65 | |
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| 66 | //////////////////////////////////////////////////////////////////// |
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| 67 | // |
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| 68 | // Array of integral probability of synchrotron photons: |
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| 69 | // |
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| 70 | // the corresponding energy = 0.0001*i*i*(characteristic energy) |
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| 71 | // |
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| 72 | |
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| 73 | const G4double |
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| 74 | G4SynchrotronRadiationInMat::fIntegralProbabilityOfSR[200] = |
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| 75 | { |
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| 76 | 1.000000e+00, 9.428859e-01, 9.094095e-01, 8.813971e-01, 8.565154e-01, |
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| 77 | 8.337008e-01, 8.124961e-01, 7.925217e-01, 7.735517e-01, 7.554561e-01, |
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| 78 | 7.381233e-01, 7.214521e-01, 7.053634e-01, 6.898006e-01, 6.747219e-01, |
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| 79 | 6.600922e-01, 6.458793e-01, 6.320533e-01, 6.185872e-01, 6.054579e-01, |
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| 80 | 5.926459e-01, 5.801347e-01, 5.679103e-01, 5.559604e-01, 5.442736e-01, |
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| 81 | 5.328395e-01, 5.216482e-01, 5.106904e-01, 4.999575e-01, 4.894415e-01, |
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| 82 | 4.791351e-01, 4.690316e-01, 4.591249e-01, 4.494094e-01, 4.398800e-01, |
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| 83 | 4.305320e-01, 4.213608e-01, 4.123623e-01, 4.035325e-01, 3.948676e-01, |
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| 84 | 3.863639e-01, 3.780179e-01, 3.698262e-01, 3.617858e-01, 3.538933e-01, |
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| 85 | 3.461460e-01, 3.385411e-01, 3.310757e-01, 3.237474e-01, 3.165536e-01, |
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| 86 | 3.094921e-01, 3.025605e-01, 2.957566e-01, 2.890784e-01, 2.825237e-01, |
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| 87 | 2.760907e-01, 2.697773e-01, 2.635817e-01, 2.575020e-01, 2.515365e-01, |
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| 88 | 2.456834e-01, 2.399409e-01, 2.343074e-01, 2.287812e-01, 2.233607e-01, |
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| 89 | 2.180442e-01, 2.128303e-01, 2.077174e-01, 2.027040e-01, 1.977885e-01, |
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| 90 | 1.929696e-01, 1.882457e-01, 1.836155e-01, 1.790775e-01, 1.746305e-01, |
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| 91 | 1.702730e-01, 1.660036e-01, 1.618212e-01, 1.577243e-01, 1.537117e-01, |
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| 92 | 1.497822e-01, 1.459344e-01, 1.421671e-01, 1.384791e-01, 1.348691e-01, |
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| 93 | 1.313360e-01, 1.278785e-01, 1.244956e-01, 1.211859e-01, 1.179483e-01, |
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| 94 | 1.147818e-01, 1.116850e-01, 1.086570e-01, 1.056966e-01, 1.028026e-01, |
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| 95 | 9.997405e-02, 9.720975e-02, 9.450865e-02, 9.186969e-02, 8.929179e-02, |
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| 96 | 8.677391e-02, 8.431501e-02, 8.191406e-02, 7.957003e-02, 7.728192e-02, |
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| 97 | 7.504872e-02, 7.286944e-02, 7.074311e-02, 6.866874e-02, 6.664538e-02, |
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| 98 | 6.467208e-02, 6.274790e-02, 6.087191e-02, 5.904317e-02, 5.726079e-02, |
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| 99 | 5.552387e-02, 5.383150e-02, 5.218282e-02, 5.057695e-02, 4.901302e-02, |
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| 100 | 4.749020e-02, 4.600763e-02, 4.456450e-02, 4.315997e-02, 4.179325e-02, |
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| 101 | 4.046353e-02, 3.917002e-02, 3.791195e-02, 3.668855e-02, 3.549906e-02, |
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| 102 | 3.434274e-02, 3.321884e-02, 3.212665e-02, 3.106544e-02, 3.003452e-02, |
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| 103 | 2.903319e-02, 2.806076e-02, 2.711656e-02, 2.619993e-02, 2.531021e-02, |
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| 104 | 2.444677e-02, 2.360897e-02, 2.279620e-02, 2.200783e-02, 2.124327e-02, |
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| 105 | 2.050194e-02, 1.978324e-02, 1.908662e-02, 1.841151e-02, 1.775735e-02, |
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| 106 | 1.712363e-02, 1.650979e-02, 1.591533e-02, 1.533973e-02, 1.478250e-02, |
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| 107 | 1.424314e-02, 1.372117e-02, 1.321613e-02, 1.272755e-02, 1.225498e-02, |
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| 108 | 1.179798e-02, 1.135611e-02, 1.092896e-02, 1.051609e-02, 1.011712e-02, |
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| 109 | 9.731635e-03, 9.359254e-03, 8.999595e-03, 8.652287e-03, 8.316967e-03, |
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| 110 | 7.993280e-03, 7.680879e-03, 7.379426e-03, 7.088591e-03, 6.808051e-03, |
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| 111 | 6.537491e-03, 6.276605e-03, 6.025092e-03, 5.782661e-03, 5.549027e-03, |
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| 112 | 5.323912e-03, 5.107045e-03, 4.898164e-03, 4.697011e-03, 4.503336e-03, |
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| 113 | 4.316896e-03, 4.137454e-03, 3.964780e-03, 3.798649e-03, 3.638843e-03, |
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| 114 | 3.485150e-03, 3.337364e-03, 3.195284e-03, 3.058715e-03, 2.927469e-03, |
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| 115 | 2.801361e-03, 2.680213e-03, 2.563852e-03, 2.452110e-03, 2.344824e-03 |
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| 116 | }; |
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| 117 | |
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| 118 | /////////////////////////////////////////////////////////////////////// |
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| 119 | // |
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| 120 | // Constructor |
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| 121 | // |
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| 122 | |
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| 123 | G4SynchrotronRadiationInMat::G4SynchrotronRadiationInMat(const G4String& processName, |
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| 124 | G4ProcessType type):G4VDiscreteProcess (processName, type), |
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| 125 | LowestKineticEnergy (10.*keV), |
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| 126 | HighestKineticEnergy (100.*TeV), |
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| 127 | TotBin(200), |
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| 128 | theGamma (G4Gamma::Gamma() ), |
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| 129 | theElectron ( G4Electron::Electron() ), |
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| 130 | thePositron ( G4Positron::Positron() ), fAlpha(0.0), fRootNumber(80), |
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| 131 | fVerboseLevel( verboseLevel ) |
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| 132 | { |
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| 133 | G4TransportationManager* transportMgr = G4TransportationManager::GetTransportationManager(); |
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| 134 | |
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| 135 | fFieldPropagator = transportMgr->GetPropagatorInField(); |
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| 136 | |
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| 137 | } |
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| 138 | |
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| 139 | ///////////////////////////////////////////////////////////////////////// |
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| 140 | // |
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| 141 | // Destructor |
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| 142 | // |
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| 143 | |
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| 144 | G4SynchrotronRadiationInMat::~G4SynchrotronRadiationInMat() |
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| 145 | { |
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| 146 | ; |
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| 147 | } |
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| 148 | |
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| 149 | |
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| 150 | /////////////////////////////// METHODS ///////////////////////////////// |
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| 151 | // |
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| 152 | // |
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| 153 | // Production of synchrotron X-ray photon |
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| 154 | // GEANT4 internal units. |
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| 155 | // |
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| 156 | |
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| 157 | |
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| 158 | G4double |
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| 159 | G4SynchrotronRadiationInMat::GetMeanFreePath( const G4Track& trackData, |
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| 160 | G4double, |
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| 161 | G4ForceCondition* condition) |
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| 162 | { |
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| 163 | // gives the MeanFreePath in GEANT4 internal units |
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| 164 | G4double MeanFreePath; |
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| 165 | |
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| 166 | const G4DynamicParticle* aDynamicParticle = trackData.GetDynamicParticle(); |
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| 167 | // G4Material* aMaterial = trackData.GetMaterial(); |
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| 168 | |
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| 169 | //G4bool isOutRange ; |
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| 170 | |
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| 171 | *condition = NotForced ; |
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| 172 | |
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| 173 | G4double gamma = aDynamicParticle->GetTotalEnergy()/ |
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| 174 | aDynamicParticle->GetMass(); |
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| 175 | |
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| 176 | G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge(); |
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| 177 | |
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| 178 | G4double KineticEnergy = aDynamicParticle->GetKineticEnergy(); |
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| 179 | |
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| 180 | if ( KineticEnergy < LowestKineticEnergy || gamma < 1.0e3 ) MeanFreePath = DBL_MAX; |
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| 181 | else |
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| 182 | { |
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| 183 | |
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| 184 | G4ThreeVector FieldValue; |
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| 185 | const G4Field* pField = 0; |
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| 186 | |
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| 187 | G4FieldManager* fieldMgr=0; |
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| 188 | G4bool fieldExertsForce = false; |
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| 189 | |
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| 190 | if( (particleCharge != 0.0) ) |
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| 191 | { |
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| 192 | fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() ); |
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| 193 | |
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| 194 | if ( fieldMgr != 0 ) |
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| 195 | { |
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| 196 | // If the field manager has no field, there is no field ! |
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| 197 | |
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| 198 | fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 ); |
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| 199 | } |
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| 200 | } |
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| 201 | if ( fieldExertsForce ) |
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| 202 | { |
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| 203 | pField = fieldMgr->GetDetectorField() ; |
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| 204 | G4ThreeVector globPosition = trackData.GetPosition(); |
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| 205 | |
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| 206 | G4double globPosVec[3], FieldValueVec[3]; |
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| 207 | |
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| 208 | globPosVec[0] = globPosition.x(); |
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| 209 | globPosVec[1] = globPosition.y(); |
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| 210 | globPosVec[2] = globPosition.z(); |
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| 211 | |
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| 212 | pField->GetFieldValue( globPosVec, FieldValueVec ); |
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| 213 | |
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| 214 | FieldValue = G4ThreeVector( FieldValueVec[0], |
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| 215 | FieldValueVec[1], |
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| 216 | FieldValueVec[2] ); |
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| 217 | |
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| 218 | |
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| 219 | |
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| 220 | G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection(); |
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| 221 | G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum) ; |
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| 222 | G4double perpB = unitMcrossB.mag() ; |
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| 223 | G4double beta = aDynamicParticle->GetTotalMomentum()/ |
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| 224 | (aDynamicParticle->GetTotalEnergy() ); |
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| 225 | |
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| 226 | if( perpB > 0.0 ) MeanFreePath = fLambdaConst*beta/perpB; |
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| 227 | else MeanFreePath = DBL_MAX; |
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| 228 | } |
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| 229 | else MeanFreePath = DBL_MAX; |
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| 230 | } |
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| 231 | if(fVerboseLevel > 0) |
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| 232 | { |
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| 233 | G4cout<<"G4SynchrotronRadiationInMat::MeanFreePath = "<<MeanFreePath/m<<" m"<<G4endl; |
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| 234 | } |
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| 235 | return MeanFreePath; |
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| 236 | } |
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| 237 | |
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| 238 | //////////////////////////////////////////////////////////////////////////////// |
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| 239 | // |
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| 240 | // |
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| 241 | |
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| 242 | G4VParticleChange* |
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| 243 | G4SynchrotronRadiationInMat::PostStepDoIt(const G4Track& trackData, |
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| 244 | const G4Step& stepData ) |
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| 245 | |
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| 246 | { |
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| 247 | aParticleChange.Initialize(trackData); |
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| 248 | |
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| 249 | const G4DynamicParticle* aDynamicParticle=trackData.GetDynamicParticle(); |
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| 250 | |
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| 251 | G4double gamma = aDynamicParticle->GetTotalEnergy()/ |
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| 252 | (aDynamicParticle->GetMass() ); |
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| 253 | |
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| 254 | if(gamma <= 1.0e3 ) |
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| 255 | { |
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| 256 | return G4VDiscreteProcess::PostStepDoIt(trackData,stepData); |
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| 257 | } |
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| 258 | G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge(); |
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| 259 | |
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| 260 | G4ThreeVector FieldValue; |
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| 261 | const G4Field* pField = 0 ; |
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| 262 | |
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| 263 | G4FieldManager* fieldMgr=0; |
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| 264 | G4bool fieldExertsForce = false; |
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| 265 | |
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| 266 | if( (particleCharge != 0.0) ) |
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| 267 | { |
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| 268 | fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() ); |
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| 269 | if ( fieldMgr != 0 ) |
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| 270 | { |
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| 271 | // If the field manager has no field, there is no field ! |
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| 272 | |
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| 273 | fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 ); |
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| 274 | } |
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| 275 | } |
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| 276 | if ( fieldExertsForce ) |
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| 277 | { |
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| 278 | pField = fieldMgr->GetDetectorField() ; |
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| 279 | G4ThreeVector globPosition = trackData.GetPosition() ; |
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| 280 | G4double globPosVec[3], FieldValueVec[3] ; |
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| 281 | globPosVec[0] = globPosition.x() ; |
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| 282 | globPosVec[1] = globPosition.y() ; |
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| 283 | globPosVec[2] = globPosition.z() ; |
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| 284 | |
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| 285 | pField->GetFieldValue( globPosVec, FieldValueVec ) ; |
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| 286 | FieldValue = G4ThreeVector( FieldValueVec[0], |
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| 287 | FieldValueVec[1], |
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| 288 | FieldValueVec[2] ); |
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| 289 | |
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| 290 | G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection(); |
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| 291 | G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum); |
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| 292 | G4double perpB = unitMcrossB.mag() ; |
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| 293 | if(perpB > 0.0) |
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| 294 | { |
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| 295 | // M-C of synchrotron photon energy |
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| 296 | |
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| 297 | G4double energyOfSR = GetRandomEnergySR(gamma,perpB); |
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| 298 | |
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| 299 | if(fVerboseLevel > 0) |
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| 300 | { |
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| 301 | G4cout<<"SR photon energy = "<<energyOfSR/keV<<" keV"<<G4endl; |
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| 302 | } |
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| 303 | // check against insufficient energy |
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| 304 | |
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| 305 | if( energyOfSR <= 0.0 ) |
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| 306 | { |
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| 307 | return G4VDiscreteProcess::PostStepDoIt(trackData,stepData); |
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| 308 | } |
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| 309 | G4double kineticEnergy = aDynamicParticle->GetKineticEnergy(); |
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| 310 | G4ParticleMomentum |
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| 311 | particleDirection = aDynamicParticle->GetMomentumDirection(); |
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| 312 | |
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| 313 | // M-C of its direction |
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| 314 | |
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| 315 | G4double Teta = G4UniformRand()/gamma ; // Very roughly |
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| 316 | |
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| 317 | G4double Phi = twopi * G4UniformRand() ; |
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| 318 | |
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| 319 | G4double dirx = sin(Teta)*cos(Phi) , |
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| 320 | diry = sin(Teta)*sin(Phi) , |
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| 321 | dirz = cos(Teta) ; |
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| 322 | |
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| 323 | G4ThreeVector gammaDirection ( dirx, diry, dirz); |
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| 324 | gammaDirection.rotateUz(particleDirection); |
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| 325 | |
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| 326 | // polarization of new gamma |
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| 327 | |
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| 328 | // G4double sx = cos(Teta)*cos(Phi); |
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| 329 | // G4double sy = cos(Teta)*sin(Phi); |
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| 330 | // G4double sz = -sin(Teta); |
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| 331 | |
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| 332 | G4ThreeVector gammaPolarization = FieldValue.cross(gammaDirection); |
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| 333 | gammaPolarization = gammaPolarization.unit(); |
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| 334 | |
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| 335 | // (sx, sy, sz); |
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| 336 | // gammaPolarization.rotateUz(particleDirection); |
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| 337 | |
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| 338 | // create G4DynamicParticle object for the SR photon |
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| 339 | |
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| 340 | G4DynamicParticle* aGamma= new G4DynamicParticle ( G4Gamma::Gamma(), |
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| 341 | gammaDirection, |
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| 342 | energyOfSR ); |
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| 343 | aGamma->SetPolarization( gammaPolarization.x(), |
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| 344 | gammaPolarization.y(), |
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| 345 | gammaPolarization.z() ); |
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| 346 | |
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| 347 | |
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| 348 | aParticleChange.SetNumberOfSecondaries(1); |
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| 349 | aParticleChange.AddSecondary(aGamma); |
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| 350 | |
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| 351 | // Update the incident particle |
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| 352 | |
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| 353 | G4double newKinEnergy = kineticEnergy - energyOfSR ; |
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| 354 | |
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| 355 | if (newKinEnergy > 0.) |
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| 356 | { |
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| 357 | aParticleChange.ProposeMomentumDirection( particleDirection ); |
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| 358 | aParticleChange.ProposeEnergy( newKinEnergy ); |
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| 359 | aParticleChange.ProposeLocalEnergyDeposit (0.); |
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| 360 | } |
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| 361 | else |
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| 362 | { |
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| 363 | aParticleChange.ProposeEnergy( 0. ); |
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| 364 | aParticleChange.ProposeLocalEnergyDeposit (0.); |
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| 365 | G4double charge = aDynamicParticle->GetDefinition()->GetPDGCharge(); |
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| 366 | if (charge<0.) |
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| 367 | { |
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| 368 | aParticleChange.ProposeTrackStatus(fStopAndKill) ; |
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| 369 | } |
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| 370 | else |
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| 371 | { |
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| 372 | aParticleChange.ProposeTrackStatus(fStopButAlive) ; |
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| 373 | } |
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| 374 | } |
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| 375 | } |
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| 376 | else |
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| 377 | { |
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| 378 | return G4VDiscreteProcess::PostStepDoIt(trackData,stepData); |
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| 379 | } |
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| 380 | } |
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| 381 | return G4VDiscreteProcess::PostStepDoIt(trackData,stepData); |
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| 382 | } |
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| 383 | |
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| 384 | |
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| 385 | G4double |
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| 386 | G4SynchrotronRadiationInMat::GetPhotonEnergy( const G4Track& trackData, |
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| 387 | const G4Step& ) |
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| 388 | |
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| 389 | { |
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| 390 | G4int i ; |
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| 391 | G4double energyOfSR = -1.0 ; |
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| 392 | //G4Material* aMaterial=trackData.GetMaterial() ; |
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| 393 | |
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| 394 | const G4DynamicParticle* aDynamicParticle=trackData.GetDynamicParticle(); |
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| 395 | |
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| 396 | G4double gamma = aDynamicParticle->GetTotalEnergy()/ |
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| 397 | (aDynamicParticle->GetMass() ) ; |
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| 398 | |
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| 399 | G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge(); |
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| 400 | |
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| 401 | G4ThreeVector FieldValue; |
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| 402 | const G4Field* pField = 0 ; |
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| 403 | |
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| 404 | G4FieldManager* fieldMgr=0; |
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| 405 | G4bool fieldExertsForce = false; |
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| 406 | |
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| 407 | if( (particleCharge != 0.0) ) |
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| 408 | { |
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| 409 | fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() ); |
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| 410 | if ( fieldMgr != 0 ) |
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| 411 | { |
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| 412 | // If the field manager has no field, there is no field ! |
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| 413 | |
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| 414 | fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 ); |
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| 415 | } |
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| 416 | } |
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| 417 | if ( fieldExertsForce ) |
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| 418 | { |
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| 419 | pField = fieldMgr->GetDetectorField(); |
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| 420 | G4ThreeVector globPosition = trackData.GetPosition(); |
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| 421 | G4double globPosVec[3], FieldValueVec[3]; |
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| 422 | |
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| 423 | globPosVec[0] = globPosition.x(); |
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| 424 | globPosVec[1] = globPosition.y(); |
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| 425 | globPosVec[2] = globPosition.z(); |
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| 426 | |
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| 427 | pField->GetFieldValue( globPosVec, FieldValueVec ); |
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| 428 | FieldValue = G4ThreeVector( FieldValueVec[0], |
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| 429 | FieldValueVec[1], |
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| 430 | FieldValueVec[2] ); |
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| 431 | |
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| 432 | G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection(); |
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| 433 | G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum) ; |
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| 434 | G4double perpB = unitMcrossB.mag(); |
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| 435 | if( perpB > 0.0 ) |
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| 436 | { |
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| 437 | // M-C of synchrotron photon energy |
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| 438 | |
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| 439 | G4double random = G4UniformRand() ; |
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| 440 | for(i=0;i<200;i++) |
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| 441 | { |
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| 442 | if(random >= fIntegralProbabilityOfSR[i]) break ; |
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| 443 | } |
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| 444 | energyOfSR = 0.0001*i*i*fEnergyConst*gamma*gamma*perpB ; |
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| 445 | |
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| 446 | // check against insufficient energy |
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| 447 | |
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| 448 | if(energyOfSR <= 0.0) |
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| 449 | { |
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| 450 | return -1.0 ; |
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| 451 | } |
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| 452 | //G4double kineticEnergy = aDynamicParticle->GetKineticEnergy(); |
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| 453 | //G4ParticleMomentum |
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| 454 | //particleDirection = aDynamicParticle->GetMomentumDirection(); |
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| 455 | |
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| 456 | // Gamma production cut in this material |
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| 457 | //G4double |
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| 458 | //gammaEnergyCut = (G4Gamma::GetCutsInEnergy())[aMaterial->GetIndex()]; |
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| 459 | |
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| 460 | // SR photon has energy more than the current material cut |
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| 461 | // M-C of its direction |
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| 462 | |
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| 463 | //G4double Teta = G4UniformRand()/gamma ; // Very roughly |
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| 464 | |
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| 465 | //G4double Phi = twopi * G4UniformRand() ; |
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| 466 | } |
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| 467 | else |
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| 468 | { |
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| 469 | return -1.0 ; |
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| 470 | } |
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| 471 | } |
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| 472 | return energyOfSR ; |
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| 473 | } |
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| 474 | |
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| 475 | ///////////////////////////////////////////////////////////////////////////////// |
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| 476 | // |
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| 477 | // |
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| 478 | |
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| 479 | G4double G4SynchrotronRadiationInMat::GetRandomEnergySR(G4double gamma, G4double perpB) |
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| 480 | { |
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| 481 | G4int i, iMax; |
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| 482 | G4double energySR, random, position; |
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| 483 | |
---|
| 484 | iMax = 200; |
---|
| 485 | random = G4UniformRand(); |
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| 486 | |
---|
| 487 | for( i = 0; i < iMax; i++ ) |
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| 488 | { |
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| 489 | if( random >= fIntegralProbabilityOfSR[i] ) break; |
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| 490 | } |
---|
| 491 | if(i <= 0 ) position = G4UniformRand(); // 0. |
---|
| 492 | else if( i>= iMax) position = G4double(iMax); |
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| 493 | else position = i + G4UniformRand(); // -1 |
---|
| 494 | // |
---|
| 495 | // it was in initial implementation: |
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| 496 | // energyOfSR = 0.0001*i*i*fEnergyConst*gamma*gamma*perpB ; |
---|
| 497 | |
---|
| 498 | energySR = 0.0001*position*position*fEnergyConst*gamma*gamma*perpB; |
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| 499 | |
---|
| 500 | if( energySR < 0. ) energySR = 0.; |
---|
| 501 | |
---|
| 502 | return energySR; |
---|
| 503 | } |
---|
| 504 | |
---|
| 505 | ///////////////////////////////////////////////////////////////////////// |
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| 506 | // |
---|
| 507 | // return |
---|
| 508 | |
---|
| 509 | G4double G4SynchrotronRadiationInMat::GetProbSpectrumSRforInt( G4double t) |
---|
| 510 | { |
---|
| 511 | G4double result, hypCos2, hypCos=std::cosh(t); |
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| 512 | |
---|
| 513 | hypCos2 = hypCos*hypCos; |
---|
| 514 | result = std::cosh(5.*t/3.)*std::exp(t-fKsi*hypCos); // fKsi > 0. ! |
---|
| 515 | result /= hypCos2; |
---|
| 516 | return result; |
---|
| 517 | } |
---|
| 518 | |
---|
| 519 | /////////////////////////////////////////////////////////////////////////// |
---|
| 520 | // |
---|
| 521 | // return the probability to emit SR photon with relative energy |
---|
| 522 | // energy/energy_c >= ksi |
---|
| 523 | // for ksi <= 0. P = 1., however the method works for ksi > 0 only! |
---|
| 524 | |
---|
| 525 | G4double G4SynchrotronRadiationInMat::GetIntProbSR( G4double ksi) |
---|
| 526 | { |
---|
| 527 | if (ksi <= 0.) return 1.0; |
---|
| 528 | fKsi = ksi; // should be > 0. ! |
---|
| 529 | G4int n; |
---|
| 530 | G4double result, a; |
---|
| 531 | |
---|
| 532 | a = fAlpha; // always = 0. |
---|
| 533 | n = fRootNumber; // around default = 80 |
---|
| 534 | |
---|
| 535 | G4Integrator<G4SynchrotronRadiationInMat, G4double(G4SynchrotronRadiationInMat::*)(G4double)> integral; |
---|
| 536 | |
---|
| 537 | result = integral.Laguerre(this, |
---|
| 538 | &G4SynchrotronRadiationInMat::GetProbSpectrumSRforInt, a, n); |
---|
| 539 | |
---|
| 540 | result *= 3./5./pi; |
---|
| 541 | |
---|
| 542 | return result; |
---|
| 543 | } |
---|
| 544 | |
---|
| 545 | ///////////////////////////////////////////////////////////////////////// |
---|
| 546 | // |
---|
| 547 | // return an auxiliary function for K_5/3 integral representation |
---|
| 548 | |
---|
| 549 | G4double G4SynchrotronRadiationInMat::GetProbSpectrumSRforEnergy( G4double t) |
---|
| 550 | { |
---|
| 551 | G4double result, hypCos=std::cosh(t); |
---|
| 552 | |
---|
| 553 | result = std::cosh(5.*t/3.)*std::exp(t - fKsi*hypCos); // fKsi > 0. ! |
---|
| 554 | result /= hypCos; |
---|
| 555 | return result; |
---|
| 556 | } |
---|
| 557 | |
---|
| 558 | /////////////////////////////////////////////////////////////////////////// |
---|
| 559 | // |
---|
| 560 | // return the probability to emit SR photon energy with relative energy |
---|
| 561 | // energy/energy_c >= ksi |
---|
| 562 | // for ksi <= 0. P = 1., however the method works for ksi > 0 only! |
---|
| 563 | |
---|
| 564 | G4double G4SynchrotronRadiationInMat::GetEnergyProbSR( G4double ksi) |
---|
| 565 | { |
---|
| 566 | if (ksi <= 0.) return 1.0; |
---|
| 567 | fKsi = ksi; // should be > 0. ! |
---|
| 568 | G4int n; |
---|
| 569 | G4double result, a; |
---|
| 570 | |
---|
| 571 | a = fAlpha; // always = 0. |
---|
| 572 | n = fRootNumber; // around default = 80 |
---|
| 573 | |
---|
| 574 | G4Integrator<G4SynchrotronRadiationInMat, G4double(G4SynchrotronRadiationInMat::*)(G4double)> integral; |
---|
| 575 | |
---|
| 576 | result = integral.Laguerre(this, |
---|
| 577 | &G4SynchrotronRadiationInMat::GetProbSpectrumSRforEnergy, a, n); |
---|
| 578 | |
---|
| 579 | result *= 9.*std::sqrt(3.)*ksi/8./pi; |
---|
| 580 | |
---|
| 581 | return result; |
---|
| 582 | } |
---|
| 583 | |
---|
| 584 | ///////////////////////////////////////////////////////////////////////////// |
---|
| 585 | // |
---|
| 586 | // |
---|
| 587 | |
---|
| 588 | G4double G4SynchrotronRadiationInMat::GetIntegrandForAngleK( G4double t) |
---|
| 589 | { |
---|
| 590 | G4double result, hypCos=std::cosh(t); |
---|
| 591 | |
---|
| 592 | result = std::cosh(fOrderAngleK*t)*std::exp(t - fEta*hypCos); // fEta > 0. ! |
---|
| 593 | result /= hypCos; |
---|
| 594 | return result; |
---|
| 595 | } |
---|
| 596 | |
---|
| 597 | ////////////////////////////////////////////////////////////////////////// |
---|
| 598 | // |
---|
| 599 | // Return K 1/3 or 2/3 for angular distribution |
---|
| 600 | |
---|
| 601 | G4double G4SynchrotronRadiationInMat::GetAngleK( G4double eta) |
---|
| 602 | { |
---|
| 603 | fEta = eta; // should be > 0. ! |
---|
| 604 | G4int n; |
---|
| 605 | G4double result, a; |
---|
| 606 | |
---|
| 607 | a = fAlpha; // always = 0. |
---|
| 608 | n = fRootNumber; // around default = 80 |
---|
| 609 | |
---|
| 610 | G4Integrator<G4SynchrotronRadiationInMat, G4double(G4SynchrotronRadiationInMat::*)(G4double)> integral; |
---|
| 611 | |
---|
| 612 | result = integral.Laguerre(this, |
---|
| 613 | &G4SynchrotronRadiationInMat::GetIntegrandForAngleK, a, n); |
---|
| 614 | |
---|
| 615 | return result; |
---|
| 616 | } |
---|
| 617 | |
---|
| 618 | ///////////////////////////////////////////////////////////////////////// |
---|
| 619 | // |
---|
| 620 | // Relative angle diff distribution for given fKsi, which is set externally |
---|
| 621 | |
---|
| 622 | G4double G4SynchrotronRadiationInMat::GetAngleNumberAtGammaKsi( G4double gpsi) |
---|
| 623 | { |
---|
| 624 | G4double result, funK, funK2, gpsi2 = gpsi*gpsi; |
---|
| 625 | |
---|
| 626 | fPsiGamma = gpsi; |
---|
| 627 | fEta = 0.5*fKsi*(1 + gpsi2)*std::sqrt(1 + gpsi2); |
---|
| 628 | |
---|
| 629 | fOrderAngleK = 1./3.; |
---|
| 630 | funK = GetAngleK(fEta); |
---|
| 631 | funK2 = funK*funK; |
---|
| 632 | |
---|
| 633 | result = gpsi2*funK2/(1 + gpsi2); |
---|
| 634 | |
---|
| 635 | fOrderAngleK = 2./3.; |
---|
| 636 | funK = GetAngleK(fEta); |
---|
| 637 | funK2 = funK*funK; |
---|
| 638 | |
---|
| 639 | result += funK2; |
---|
| 640 | result *= (1 + gpsi2)*fKsi; |
---|
| 641 | |
---|
| 642 | return result; |
---|
| 643 | } |
---|
| 644 | |
---|
| 645 | |
---|
| 646 | ///////////////////// end of G4SynchrotronRadiationInMat.cc |
---|
| 647 | |
---|