Gabriele Cosmo
585 lines
20 KiB
C++
585 lines
20 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// --------------------------------------------------------------
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// GEANT 4 class implementation file
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//
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// History: first implementation,
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// 21-5-98 V.Grichine
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// 28-05-01, V.Ivanchenko minor changes to provide ANSI -wall compilation
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// 04.03.05, V.Grichine: get local field interface
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// 19-05-06, V.Ivanchenko rename from G4SynchrotronRadiation
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//
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///////////////////////////////////////////////////////////////////////////
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#include "G4SynchrotronRadiationInMat.hh"
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#include "G4EmProcessSubType.hh"
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#include "G4Field.hh"
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#include "G4FieldManager.hh"
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#include "G4Integrator.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4PropagatorInField.hh"
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#include "G4SystemOfUnits.hh"
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const G4double G4SynchrotronRadiationInMat::fIntegralProbabilityOfSR[200] = {
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1.000000e+00, 9.428859e-01, 9.094095e-01, 8.813971e-01, 8.565154e-01,
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8.337008e-01, 8.124961e-01, 7.925217e-01, 7.735517e-01, 7.554561e-01,
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7.381233e-01, 7.214521e-01, 7.053634e-01, 6.898006e-01, 6.747219e-01,
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6.600922e-01, 6.458793e-01, 6.320533e-01, 6.185872e-01, 6.054579e-01,
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5.926459e-01, 5.801347e-01, 5.679103e-01, 5.559604e-01, 5.442736e-01,
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5.328395e-01, 5.216482e-01, 5.106904e-01, 4.999575e-01, 4.894415e-01,
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4.791351e-01, 4.690316e-01, 4.591249e-01, 4.494094e-01, 4.398800e-01,
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4.305320e-01, 4.213608e-01, 4.123623e-01, 4.035325e-01, 3.948676e-01,
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3.863639e-01, 3.780179e-01, 3.698262e-01, 3.617858e-01, 3.538933e-01,
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3.461460e-01, 3.385411e-01, 3.310757e-01, 3.237474e-01, 3.165536e-01,
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3.094921e-01, 3.025605e-01, 2.957566e-01, 2.890784e-01, 2.825237e-01,
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2.760907e-01, 2.697773e-01, 2.635817e-01, 2.575020e-01, 2.515365e-01,
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2.456834e-01, 2.399409e-01, 2.343074e-01, 2.287812e-01, 2.233607e-01,
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2.180442e-01, 2.128303e-01, 2.077174e-01, 2.027040e-01, 1.977885e-01,
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1.929696e-01, 1.882457e-01, 1.836155e-01, 1.790775e-01, 1.746305e-01,
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1.702730e-01, 1.660036e-01, 1.618212e-01, 1.577243e-01, 1.537117e-01,
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1.497822e-01, 1.459344e-01, 1.421671e-01, 1.384791e-01, 1.348691e-01,
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1.313360e-01, 1.278785e-01, 1.244956e-01, 1.211859e-01, 1.179483e-01,
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1.147818e-01, 1.116850e-01, 1.086570e-01, 1.056966e-01, 1.028026e-01,
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9.997405e-02, 9.720975e-02, 9.450865e-02, 9.186969e-02, 8.929179e-02,
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8.677391e-02, 8.431501e-02, 8.191406e-02, 7.957003e-02, 7.728192e-02,
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7.504872e-02, 7.286944e-02, 7.074311e-02, 6.866874e-02, 6.664538e-02,
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6.467208e-02, 6.274790e-02, 6.087191e-02, 5.904317e-02, 5.726079e-02,
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5.552387e-02, 5.383150e-02, 5.218282e-02, 5.057695e-02, 4.901302e-02,
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4.749020e-02, 4.600763e-02, 4.456450e-02, 4.315997e-02, 4.179325e-02,
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4.046353e-02, 3.917002e-02, 3.791195e-02, 3.668855e-02, 3.549906e-02,
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3.434274e-02, 3.321884e-02, 3.212665e-02, 3.106544e-02, 3.003452e-02,
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2.903319e-02, 2.806076e-02, 2.711656e-02, 2.619993e-02, 2.531021e-02,
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2.444677e-02, 2.360897e-02, 2.279620e-02, 2.200783e-02, 2.124327e-02,
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2.050194e-02, 1.978324e-02, 1.908662e-02, 1.841151e-02, 1.775735e-02,
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1.712363e-02, 1.650979e-02, 1.591533e-02, 1.533973e-02, 1.478250e-02,
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1.424314e-02, 1.372117e-02, 1.321613e-02, 1.272755e-02, 1.225498e-02,
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1.179798e-02, 1.135611e-02, 1.092896e-02, 1.051609e-02, 1.011712e-02,
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9.731635e-03, 9.359254e-03, 8.999595e-03, 8.652287e-03, 8.316967e-03,
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7.993280e-03, 7.680879e-03, 7.379426e-03, 7.088591e-03, 6.808051e-03,
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6.537491e-03, 6.276605e-03, 6.025092e-03, 5.782661e-03, 5.549027e-03,
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5.323912e-03, 5.107045e-03, 4.898164e-03, 4.697011e-03, 4.503336e-03,
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4.316896e-03, 4.137454e-03, 3.964780e-03, 3.798649e-03, 3.638843e-03,
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3.485150e-03, 3.337364e-03, 3.195284e-03, 3.058715e-03, 2.927469e-03,
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2.801361e-03, 2.680213e-03, 2.563852e-03, 2.452110e-03, 2.344824e-03
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};
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///////////////////////////////////////////////////////////////////////
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// Constructor
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G4SynchrotronRadiationInMat::G4SynchrotronRadiationInMat(
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const G4String& processName, G4ProcessType type)
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: G4VDiscreteProcess(processName, type)
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, theGamma(G4Gamma::Gamma())
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, theElectron(G4Electron::Electron())
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, thePositron(G4Positron::Positron())
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, LowestKineticEnergy(10. * keV)
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, fAlpha(0.0)
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, fRootNumber(80)
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, fVerboseLevel(verboseLevel)
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{
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G4TransportationManager* transportMgr =
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G4TransportationManager::GetTransportationManager();
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fFieldPropagator = transportMgr->GetPropagatorInField();
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SetProcessSubType(fSynchrotronRadiation);
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CutInRange = GammaCutInKineticEnergyNow = ElectronCutInKineticEnergyNow =
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PositronCutInKineticEnergyNow = ParticleCutInKineticEnergyNow = fKsi =
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fPsiGamma = fEta = fOrderAngleK = 0.0;
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}
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/////////////////////////////////////////////////////////////////////////
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// Destructor
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G4SynchrotronRadiationInMat::~G4SynchrotronRadiationInMat() {}
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G4bool G4SynchrotronRadiationInMat::IsApplicable(
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const G4ParticleDefinition& particle)
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{
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return ((&particle == (const G4ParticleDefinition*) theElectron) ||
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(&particle == (const G4ParticleDefinition*) thePositron));
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}
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G4double G4SynchrotronRadiationInMat::GetLambdaConst() { return fLambdaConst; }
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G4double G4SynchrotronRadiationInMat::GetEnergyConst() { return fEnergyConst; }
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// Production of synchrotron X-ray photon
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// Geant4 internal units.
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G4double G4SynchrotronRadiationInMat::GetMeanFreePath(
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const G4Track& trackData, G4double, G4ForceCondition* condition)
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{
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// gives the MeanFreePath in GEANT4 internal units
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G4double MeanFreePath;
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const G4DynamicParticle* aDynamicParticle = trackData.GetDynamicParticle();
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*condition = NotForced;
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G4double gamma =
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aDynamicParticle->GetTotalEnergy() / aDynamicParticle->GetMass();
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G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge();
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G4double KineticEnergy = aDynamicParticle->GetKineticEnergy();
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if(KineticEnergy < LowestKineticEnergy || gamma < 1.0e3)
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MeanFreePath = DBL_MAX;
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else
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{
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G4ThreeVector FieldValue;
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const G4Field* pField = nullptr;
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G4FieldManager* fieldMgr = nullptr;
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G4bool fieldExertsForce = false;
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if((particleCharge != 0.0))
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{
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fieldMgr =
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fFieldPropagator->FindAndSetFieldManager(trackData.GetVolume());
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if(fieldMgr != nullptr)
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{
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// If the field manager has no field, there is no field !
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fieldExertsForce = (fieldMgr->GetDetectorField() != nullptr);
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}
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}
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if(fieldExertsForce)
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{
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pField = fieldMgr->GetDetectorField();
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G4ThreeVector globPosition = trackData.GetPosition();
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G4double globPosVec[4], FieldValueVec[6];
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globPosVec[0] = globPosition.x();
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globPosVec[1] = globPosition.y();
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globPosVec[2] = globPosition.z();
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globPosVec[3] = trackData.GetGlobalTime();
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pField->GetFieldValue(globPosVec, FieldValueVec);
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FieldValue =
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G4ThreeVector(FieldValueVec[0], FieldValueVec[1], FieldValueVec[2]);
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G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection();
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G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum);
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G4double perpB = unitMcrossB.mag();
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G4double beta = aDynamicParticle->GetTotalMomentum() /
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(aDynamicParticle->GetTotalEnergy());
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if(perpB > 0.0)
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MeanFreePath = fLambdaConst * beta / perpB;
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else
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MeanFreePath = DBL_MAX;
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}
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else
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MeanFreePath = DBL_MAX;
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}
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if(fVerboseLevel > 0)
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{
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G4cout << "G4SynchrotronRadiationInMat::MeanFreePath = " << MeanFreePath / m
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<< " m" << G4endl;
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}
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return MeanFreePath;
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}
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////////////////////////////////////////////////////////////////////////////////
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G4VParticleChange* G4SynchrotronRadiationInMat::PostStepDoIt(
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const G4Track& trackData, const G4Step& stepData)
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{
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aParticleChange.Initialize(trackData);
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const G4DynamicParticle* aDynamicParticle = trackData.GetDynamicParticle();
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G4double gamma =
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aDynamicParticle->GetTotalEnergy() / (aDynamicParticle->GetMass());
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if(gamma <= 1.0e3)
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{
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return G4VDiscreteProcess::PostStepDoIt(trackData, stepData);
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}
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G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge();
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G4ThreeVector FieldValue;
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const G4Field* pField = nullptr;
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G4FieldManager* fieldMgr = nullptr;
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G4bool fieldExertsForce = false;
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if((particleCharge != 0.0))
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{
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fieldMgr = fFieldPropagator->FindAndSetFieldManager(trackData.GetVolume());
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if(fieldMgr != nullptr)
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{
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// If the field manager has no field, there is no field !
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fieldExertsForce = (fieldMgr->GetDetectorField() != nullptr);
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}
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}
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if(fieldExertsForce)
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{
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pField = fieldMgr->GetDetectorField();
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G4ThreeVector globPosition = trackData.GetPosition();
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G4double globPosVec[4], FieldValueVec[6];
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globPosVec[0] = globPosition.x();
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globPosVec[1] = globPosition.y();
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globPosVec[2] = globPosition.z();
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globPosVec[3] = trackData.GetGlobalTime();
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pField->GetFieldValue(globPosVec, FieldValueVec);
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FieldValue =
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G4ThreeVector(FieldValueVec[0], FieldValueVec[1], FieldValueVec[2]);
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G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection();
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G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum);
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G4double perpB = unitMcrossB.mag();
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if(perpB > 0.0)
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{
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// M-C of synchrotron photon energy
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G4double energyOfSR = GetRandomEnergySR(gamma, perpB);
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if(fVerboseLevel > 0)
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{
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G4cout << "SR photon energy = " << energyOfSR / keV << " keV" << G4endl;
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}
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// check against insufficient energy
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if(energyOfSR <= 0.0)
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{
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return G4VDiscreteProcess::PostStepDoIt(trackData, stepData);
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}
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G4double kineticEnergy = aDynamicParticle->GetKineticEnergy();
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G4ParticleMomentum particleDirection =
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aDynamicParticle->GetMomentumDirection();
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// M-C of its direction, simplified dipole busted approach
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G4double cosTheta, sinTheta, fcos, beta;
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do
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{
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cosTheta = 1. - 2. * G4UniformRand();
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fcos = (1 + cosTheta * cosTheta) * 0.5;
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}
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// Loop checking, 07-Aug-2015, Vladimir Ivanchenko
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while(fcos < G4UniformRand());
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beta = std::sqrt(1. - 1. / (gamma * gamma));
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cosTheta = (cosTheta + beta) / (1. + beta * cosTheta);
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if(cosTheta > 1.)
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cosTheta = 1.;
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if(cosTheta < -1.)
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cosTheta = -1.;
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sinTheta = std::sqrt(1. - cosTheta * cosTheta);
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G4double Phi = twopi * G4UniformRand();
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G4double dirx = sinTheta * std::cos(Phi);
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G4double diry = sinTheta * std::sin(Phi);
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G4double dirz = cosTheta;
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G4ThreeVector gammaDirection(dirx, diry, dirz);
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gammaDirection.rotateUz(particleDirection);
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// polarization of new gamma
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G4ThreeVector gammaPolarization = FieldValue.cross(gammaDirection);
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gammaPolarization = gammaPolarization.unit();
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// create G4DynamicParticle object for the SR photon
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G4DynamicParticle* aGamma =
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new G4DynamicParticle(G4Gamma::Gamma(), gammaDirection, energyOfSR);
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aGamma->SetPolarization(gammaPolarization.x(), gammaPolarization.y(),
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gammaPolarization.z());
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aParticleChange.SetNumberOfSecondaries(1);
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aParticleChange.AddSecondary(aGamma);
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// Update the incident particle
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G4double newKinEnergy = kineticEnergy - energyOfSR;
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if(newKinEnergy > 0.)
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{
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aParticleChange.ProposeMomentumDirection(particleDirection);
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aParticleChange.ProposeEnergy(newKinEnergy);
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aParticleChange.ProposeLocalEnergyDeposit(0.);
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}
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else
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{
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aParticleChange.ProposeEnergy(0.);
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aParticleChange.ProposeLocalEnergyDeposit(0.);
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G4double charge = aDynamicParticle->GetDefinition()->GetPDGCharge();
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if(charge < 0.)
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{
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aParticleChange.ProposeTrackStatus(fStopAndKill);
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}
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else
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{
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aParticleChange.ProposeTrackStatus(fStopButAlive);
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}
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}
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}
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else
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{
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return G4VDiscreteProcess::PostStepDoIt(trackData, stepData);
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}
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}
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return G4VDiscreteProcess::PostStepDoIt(trackData, stepData);
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}
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G4double G4SynchrotronRadiationInMat::GetPhotonEnergy(const G4Track& trackData,
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const G4Step&)
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{
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G4int i;
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G4double energyOfSR = -1.0;
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const G4DynamicParticle* aDynamicParticle = trackData.GetDynamicParticle();
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G4double gamma =
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aDynamicParticle->GetTotalEnergy() / (aDynamicParticle->GetMass());
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G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge();
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G4ThreeVector FieldValue;
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const G4Field* pField = nullptr;
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G4FieldManager* fieldMgr = nullptr;
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G4bool fieldExertsForce = false;
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if((particleCharge != 0.0))
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{
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fieldMgr = fFieldPropagator->FindAndSetFieldManager(trackData.GetVolume());
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if(fieldMgr != nullptr)
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{
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// If the field manager has no field, there is no field !
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fieldExertsForce = (fieldMgr->GetDetectorField() != nullptr);
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}
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}
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if(fieldExertsForce)
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{
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pField = fieldMgr->GetDetectorField();
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G4ThreeVector globPosition = trackData.GetPosition();
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G4double globPosVec[3], FieldValueVec[3];
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globPosVec[0] = globPosition.x();
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globPosVec[1] = globPosition.y();
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globPosVec[2] = globPosition.z();
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pField->GetFieldValue(globPosVec, FieldValueVec);
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FieldValue =
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G4ThreeVector(FieldValueVec[0], FieldValueVec[1], FieldValueVec[2]);
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G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection();
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G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum);
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G4double perpB = unitMcrossB.mag();
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if(perpB > 0.0)
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{
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// M-C of synchrotron photon energy
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G4double random = G4UniformRand();
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for(i = 0; i < 200; ++i)
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{
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if(random >= fIntegralProbabilityOfSR[i])
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break;
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}
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energyOfSR = 0.0001 * i * i * fEnergyConst * gamma * gamma * perpB;
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// check against insufficient energy
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if(energyOfSR <= 0.0)
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{
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return -1.0;
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}
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}
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else
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{
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return -1.0;
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}
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}
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return energyOfSR;
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}
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/////////////////////////////////////////////////////////////////////////////////
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G4double G4SynchrotronRadiationInMat::GetRandomEnergySR(G4double gamma,
|
|
G4double perpB)
|
|
{
|
|
G4int i;
|
|
static constexpr G4int iMax = 200;
|
|
G4double energySR, random, position;
|
|
|
|
random = G4UniformRand();
|
|
|
|
for(i = 0; i < iMax; ++i)
|
|
{
|
|
if(random >= fIntegralProbabilityOfSR[i])
|
|
break;
|
|
}
|
|
if(i <= 0)
|
|
position = G4UniformRand();
|
|
else if(i >= iMax)
|
|
position = G4double(iMax);
|
|
else
|
|
position = i + G4UniformRand();
|
|
|
|
energySR =
|
|
0.0001 * position * position * fEnergyConst * gamma * gamma * perpB;
|
|
|
|
if(energySR < 0.)
|
|
energySR = 0.;
|
|
|
|
return energySR;
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////////////////
|
|
G4double G4SynchrotronRadiationInMat::GetProbSpectrumSRforInt(G4double t)
|
|
{
|
|
G4double result, hypCos2, hypCos = std::cosh(t);
|
|
|
|
hypCos2 = hypCos * hypCos;
|
|
result = std::cosh(5. * t / 3.) * std::exp(t - fKsi * hypCos); // fKsi > 0. !
|
|
result /= hypCos2;
|
|
return result;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
// return the probability to emit SR photon with relative energy
|
|
// energy/energy_c >= ksi
|
|
// for ksi <= 0. P = 1., however the method works for ksi > 0 only!
|
|
G4double G4SynchrotronRadiationInMat::GetIntProbSR(G4double ksi)
|
|
{
|
|
if(ksi <= 0.)
|
|
return 1.0;
|
|
fKsi = ksi; // should be > 0. !
|
|
G4int n;
|
|
G4double result, a;
|
|
|
|
a = fAlpha; // always = 0.
|
|
n = fRootNumber; // around default = 80
|
|
|
|
G4Integrator<G4SynchrotronRadiationInMat,
|
|
G4double (G4SynchrotronRadiationInMat::*)(G4double)>
|
|
integral;
|
|
|
|
result = integral.Laguerre(
|
|
this, &G4SynchrotronRadiationInMat::GetProbSpectrumSRforInt, a, n);
|
|
|
|
result *= 3. / 5. / pi;
|
|
|
|
return result;
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////////////////
|
|
// return an auxiliary function for K_5/3 integral representation
|
|
G4double G4SynchrotronRadiationInMat::GetProbSpectrumSRforEnergy(G4double t)
|
|
{
|
|
G4double result, hypCos = std::cosh(t);
|
|
|
|
result = std::cosh(5. * t / 3.) * std::exp(t - fKsi * hypCos); // fKsi > 0. !
|
|
result /= hypCos;
|
|
return result;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
// return the probability to emit SR photon energy with relative energy
|
|
// energy/energy_c >= ksi
|
|
// for ksi <= 0. P = 1., however the method works for ksi > 0 only!
|
|
G4double G4SynchrotronRadiationInMat::GetEnergyProbSR(G4double ksi)
|
|
{
|
|
if(ksi <= 0.)
|
|
return 1.0;
|
|
fKsi = ksi; // should be > 0. !
|
|
G4int n;
|
|
G4double result, a;
|
|
|
|
a = fAlpha; // always = 0.
|
|
n = fRootNumber; // around default = 80
|
|
|
|
G4Integrator<G4SynchrotronRadiationInMat,
|
|
G4double (G4SynchrotronRadiationInMat::*)(G4double)>
|
|
integral;
|
|
|
|
result = integral.Laguerre(
|
|
this, &G4SynchrotronRadiationInMat::GetProbSpectrumSRforEnergy, a, n);
|
|
|
|
result *= 9. * std::sqrt(3.) * ksi / 8. / pi;
|
|
|
|
return result;
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
G4double G4SynchrotronRadiationInMat::GetIntegrandForAngleK(G4double t)
|
|
{
|
|
G4double result, hypCos = std::cosh(t);
|
|
|
|
result =
|
|
std::cosh(fOrderAngleK * t) * std::exp(t - fEta * hypCos); // fEta > 0. !
|
|
result /= hypCos;
|
|
return result;
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////
|
|
// Return K 1/3 or 2/3 for angular distribution
|
|
G4double G4SynchrotronRadiationInMat::GetAngleK(G4double eta)
|
|
{
|
|
fEta = eta; // should be > 0. !
|
|
G4int n;
|
|
G4double result, a;
|
|
|
|
a = fAlpha; // always = 0.
|
|
n = fRootNumber; // around default = 80
|
|
|
|
G4Integrator<G4SynchrotronRadiationInMat,
|
|
G4double (G4SynchrotronRadiationInMat::*)(G4double)>
|
|
integral;
|
|
|
|
result = integral.Laguerre(
|
|
this, &G4SynchrotronRadiationInMat::GetIntegrandForAngleK, a, n);
|
|
|
|
return result;
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////////////////
|
|
// Relative angle diff distribution for given fKsi, which is set externally
|
|
G4double G4SynchrotronRadiationInMat::GetAngleNumberAtGammaKsi(G4double gpsi)
|
|
{
|
|
G4double result, funK, funK2, gpsi2 = gpsi * gpsi;
|
|
|
|
fPsiGamma = gpsi;
|
|
fEta = 0.5 * fKsi * (1. + gpsi2) * std::sqrt(1. + gpsi2);
|
|
|
|
fOrderAngleK = 1. / 3.;
|
|
funK = GetAngleK(fEta);
|
|
funK2 = funK * funK;
|
|
|
|
result = gpsi2 * funK2 / (1. + gpsi2);
|
|
|
|
fOrderAngleK = 2. / 3.;
|
|
funK = GetAngleK(fEta);
|
|
funK2 = funK * funK;
|
|
|
|
result += funK2;
|
|
result *= (1. + gpsi2) * fKsi;
|
|
|
|
return result;
|
|
}
|