00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // $Id$ 00027 // 00028 // ------------------------------------------------------------------- 00029 // 00030 // GEANT4 Class file 00031 // 00032 // 00033 // File name: G4CoulombScattering 00034 // 00035 // Author: Vladimir Ivanchenko 00036 // 00037 // Creation date: 22.08.2004 00038 // 00039 // Modifications: 00040 // 01.08.06 V.Ivanchenko add choice between G4eCoulombScatteringModel and 00041 // G4CoulombScatteringModel 00042 // 00043 00044 // 00045 // ------------------------------------------------------------------- 00046 // 00047 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00048 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00049 00050 #include "G4CoulombScattering.hh" 00051 #include "G4SystemOfUnits.hh" 00052 #include "G4eCoulombScatteringModel.hh" 00053 #include "G4Proton.hh" 00054 #include "G4LossTableManager.hh" 00055 00056 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00057 00058 using namespace std; 00059 00060 G4CoulombScattering::G4CoulombScattering(const G4String& name) 00061 : G4VEmProcess(name),q2Max(TeV*TeV),isInitialised(false) 00062 { 00063 // G4cout << "G4CoulombScattering constructor "<< G4endl; 00064 SetBuildTableFlag(true); 00065 SetStartFromNullFlag(false); 00066 SetIntegral(true); 00067 SetSecondaryParticle(G4Proton::Proton()); 00068 SetProcessSubType(fCoulombScattering); 00069 SetSplineFlag(true); 00070 } 00071 00072 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00073 00074 G4CoulombScattering::~G4CoulombScattering() 00075 {} 00076 00077 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00078 00079 G4bool G4CoulombScattering::IsApplicable(const G4ParticleDefinition& p) 00080 { 00081 return (p.GetPDGCharge() != 0.0 && !p.IsShortLived()); 00082 } 00083 00084 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00085 00086 void G4CoulombScattering::InitialiseProcess(const G4ParticleDefinition* p) 00087 { 00088 // second initialisation not allowed for the time being 00089 // this means that polar angle limit change will not be appled 00090 // after first initialisation 00091 if(isInitialised) { return; } 00092 00093 G4double a = G4LossTableManager::Instance()->FactorForAngleLimit() 00094 *CLHEP::hbarc/CLHEP::fermi; 00095 q2Max = 0.5*a*a; 00096 G4double theta = PolarAngleLimit(); 00097 00098 // restricted or non-restricted cross section table 00099 G4bool yes = false; 00100 if(theta == CLHEP::pi) { yes = true; } 00101 SetStartFromNullFlag(yes); 00102 /* 00103 G4cout << "### G4CoulombScattering::InitialiseProcess: " 00104 << p->GetParticleName() 00105 << " Emin(MeV)= " << MinKinEnergy()/MeV 00106 << " Emax(TeV)= " << MaxKinEnergy()/TeV 00107 << " nbins= " << LambdaBinning() 00108 << " theta= " << theta 00109 << G4endl; 00110 */ 00111 /* 00112 // second initialisation 00113 if(isInitialised) { 00114 G4VEmModel* mod = EmModel(1); 00115 mod->SetPolarAngleLimit(theta); 00116 mod = GetModelByIndex(1); 00117 if(mod) { mod->SetPolarAngleLimit(theta); } 00118 00119 // first initialisation 00120 } else { 00121 */ 00122 00123 isInitialised = true; 00124 G4double mass = p->GetPDGMass(); 00125 G4String name = p->GetParticleName(); 00126 //G4cout << name << " type: " << p->GetParticleType() 00127 //<< " mass= " << mass << G4endl; 00128 if (mass > GeV || p->GetParticleType() == "nucleus") { 00129 SetBuildTableFlag(false); 00130 if(name != "GenericIon") { SetVerboseLevel(0); } 00131 } else { 00132 if(name != "e-" && name != "e+" && 00133 name != "mu+" && name != "mu-" && name != "pi+" && 00134 name != "kaon+" && name != "proton" ) { SetVerboseLevel(0); } 00135 } 00136 00137 if(!EmModel(1)) { SetEmModel(new G4eCoulombScatteringModel(), 1); } 00138 G4VEmModel* model = EmModel(1); 00139 G4double emin = std::max(MinKinEnergy(),model->LowEnergyLimit()); 00140 G4double emax = std::min(MaxKinEnergy(),model->HighEnergyLimit()); 00141 model->SetPolarAngleLimit(theta); 00142 model->SetLowEnergyLimit(emin); 00143 model->SetHighEnergyLimit(emax); 00144 AddEmModel(1, model); 00145 } 00146 00147 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00148 00149 G4double G4CoulombScattering::MinPrimaryEnergy(const G4ParticleDefinition* part, 00150 const G4Material* mat) 00151 { 00152 // Pure Coulomb scattering 00153 G4double emin = 0.0; 00154 00155 // Coulomb scattering combined with multiple or hadronic scattering 00156 G4double theta = PolarAngleLimit(); 00157 if(0.0 < theta) { 00158 G4double p2 = q2Max*mat->GetIonisation()->GetInvA23()/(1.0 - cos(theta)); 00159 G4double mass = part->GetPDGMass(); 00160 emin = sqrt(p2 + mass*mass) - mass; 00161 } 00162 00163 return emin; 00164 } 00165 00166 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00167 00168 void G4CoulombScattering::PrintInfo() 00169 { 00170 G4cout << " " << PolarAngleLimit()/degree 00171 << " < Theta(degree) < 180"; 00172 00173 if(q2Max < DBL_MAX) { G4cout << "; pLimit(GeV^1)= " << sqrt(q2Max)/GeV; } 00174 G4cout << G4endl; 00175 } 00176 00177 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....