Gabriele Cosmo
297 lines
8.8 KiB
C++
Executable File
297 lines
8.8 KiB
C++
Executable File
//
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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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// $Id: G4EmSaturation.cc,v 1.11 2010/10/25 17:23:01 vnivanch Exp $
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// GEANT4 tag $Name: geant4-09-04 $
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class file
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//
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//
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// File name: G4EmSaturation
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 18.02.2008
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//
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// Modifications:
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//
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// -------------------------------------------------------------
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4EmSaturation.hh"
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#include "G4LossTableManager.hh"
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#include "G4NistManager.hh"
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#include "G4Material.hh"
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#include "G4MaterialCutsCouple.hh"
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#include "G4Electron.hh"
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#include "G4Proton.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4EmSaturation::G4EmSaturation()
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{
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verbose = 1;
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manager = 0;
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curMaterial = 0;
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curBirks = 0.0;
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curRatio = 1.0;
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curChargeSq = 1.0;
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nMaterials = 0;
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electron = 0;
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proton = 0;
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nist = G4NistManager::Instance();
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Initialise();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4EmSaturation::~G4EmSaturation()
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4EmSaturation::VisibleEnergyDeposition(
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const G4ParticleDefinition* p,
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const G4MaterialCutsCouple* couple,
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G4double length,
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G4double edep,
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G4double niel)
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{
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if(edep <= 0.0) { return 0.0; }
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G4double evis = edep;
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G4double bfactor = FindBirksCoefficient(couple->GetMaterial());
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if(bfactor > 0.0) {
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G4int pdgCode = p->GetPDGEncoding();
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// atomic relaxations for gamma incident
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if(22 == pdgCode) {
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evis /= (1.0 + bfactor*edep/manager->GetRange(electron,edep,couple));
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// energy loss
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} else {
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// protections
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G4double nloss = niel;
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if(nloss < 0.0) nloss = 0.0;
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G4double eloss = edep - nloss;
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// neutrons
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if(2112 == pdgCode || eloss < 0.0 || length <= 0.0) {
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nloss = edep;
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eloss = 0.0;
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}
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// continues energy loss
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if(eloss > 0.0) { eloss /= (1.0 + bfactor*eloss/length); }
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// non-ionizing energy loss
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if(nloss > 0.0) {
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if(!proton) { proton = G4Proton::Proton(); }
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G4double escaled = nloss*curRatio;
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G4double s = manager->GetRange(proton,escaled,couple)/curChargeSq;
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nloss /= (1.0 + bfactor*nloss/s);
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}
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evis = eloss + nloss;
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}
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}
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return evis;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4EmSaturation::FindG4BirksCoefficient(const G4Material* mat)
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{
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G4String name = mat->GetName();
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// is this material in the vector?
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for(G4int j=0; j<nG4Birks; ++j) {
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if(name == g4MatNames[j]) {
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if(verbose > 0)
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G4cout << "### G4EmSaturation::FindG4BirksCoefficient for "
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<< name << " is " << g4MatData[j]*MeV/mm << " mm/MeV "
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<< G4endl;
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return g4MatData[j];
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}
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}
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return FindBirksCoefficient(mat);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4EmSaturation::FindBirksCoefficient(const G4Material* mat)
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{
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// electron should exist in any case
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if(!manager) {
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manager = G4LossTableManager::Instance();
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electron= G4Electron::Electron();
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}
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if(mat == curMaterial) { return curBirks; }
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curMaterial = mat;
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curBirks = 0.0;
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curRatio = 1.0;
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curChargeSq = 1.0;
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// seach in the run-time list
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for(G4int i=0; i<nMaterials; ++i) {
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if(mat == matPointers[i]) {
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curBirks = mat->GetIonisation()->GetBirksConstant();
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curRatio = massFactors[i];
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curChargeSq = effCharges[i];
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return curBirks;
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}
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}
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G4String name = mat->GetName();
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curBirks = mat->GetIonisation()->GetBirksConstant();
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// material has no Birks coeffitient defined
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// seach in the Geant4 list
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if(curBirks == 0.0) {
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for(G4int j=0; j<nG4Birks; ++j) {
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if(name == g4MatNames[j]) {
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mat->GetIonisation()->SetBirksConstant(g4MatData[j]);
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curBirks = g4MatData[j];
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break;
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}
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}
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}
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if(curBirks == 0.0 && verbose > 0) {
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G4cout << "### G4EmSaturation::FindBirksCoefficient fails "
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" for material " << name << G4endl;
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}
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// compute mean mass ratio
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curRatio = 0.0;
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curChargeSq = 0.0;
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G4double norm = 0.0;
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const G4ElementVector* theElementVector = mat->GetElementVector();
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const G4double* theAtomNumDensityVector = mat->GetVecNbOfAtomsPerVolume();
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size_t nelm = mat->GetNumberOfElements();
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for (size_t i=0; i<nelm; ++i) {
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const G4Element* elm = (*theElementVector)[i];
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G4double Z = elm->GetZ();
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G4double w = Z*Z*theAtomNumDensityVector[i];
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curRatio += w/nist->GetAtomicMassAmu(G4int(Z));
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curChargeSq = Z*Z*w;
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norm += w;
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}
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curRatio *= proton_mass_c2/norm;
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curChargeSq /= norm;
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// store results
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matPointers.push_back(mat);
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matNames.push_back(name);
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massFactors.push_back(curRatio);
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effCharges.push_back(curChargeSq);
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nMaterials++;
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if(curBirks > 0.0 && verbose > 0) {
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G4cout << "### G4EmSaturation::FindBirksCoefficient Birks coefficient for "
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<< name << " " << curBirks*MeV/mm << " mm/MeV" << G4endl;
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}
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return curBirks;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4EmSaturation::DumpBirksCoefficients()
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{
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if(nMaterials > 0) {
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G4cout << "### Birks coeffitients used in run time" << G4endl;
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for(G4int i=0; i<nMaterials; ++i) {
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G4double br = matPointers[i]->GetIonisation()->GetBirksConstant();
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G4cout << " " << matNames[i] << " "
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<< br*MeV/mm << " mm/MeV" << " "
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<< br*matPointers[i]->GetDensity()*MeV*cm2/g
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<< " g/cm^2/MeV"
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<< G4endl;
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}
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4EmSaturation::DumpG4BirksCoefficients()
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{
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if(nG4Birks > 0) {
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G4cout << "### Birks coeffitients for Geant4 materials" << G4endl;
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for(G4int i=0; i<nG4Birks; ++i) {
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G4cout << " " << g4MatNames[i] << " "
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<< g4MatData[i]*MeV/mm << " mm/MeV" << G4endl;
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}
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4EmSaturation::Initialise()
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{
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// M.Hirschberg et al., IEEE Trans. Nuc. Sci. 39 (1992) 511
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// SCSN-38 kB = 0.00842 g/cm^2/MeV; rho = 1.06 g/cm^3
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g4MatNames.push_back("G4_POLYSTYRENE");
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g4MatData.push_back(0.07943*mm/MeV);
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// C.Fabjan (private communication)
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// kB = 0.006 g/cm^2/MeV; rho = 7.13 g/cm^3
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g4MatNames.push_back("G4_BGO");
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g4MatData.push_back(0.008415*mm/MeV);
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// A.Ribon analysis of publications
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// Scallettar et al., Phys. Rev. A25 (1982) 2419.
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// NIM A 523 (2004) 275.
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// kB = 0.022 g/cm^2/MeV; rho = 1.396 g/cm^3;
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// ATLAS Efield = 10 kV/cm provide the strongest effect
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g4MatNames.push_back("G4_lAr");
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g4MatData.push_back(0.1576*mm/MeV);
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//G4_BARIUM_FLUORIDE
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//G4_CESIUM_IODIDE
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//G4_GEL_PHOTO_EMULSION
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//G4_PHOTO_EMULSION
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//G4_PLASTIC_SC_VINYLTOLUENE
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//G4_SODIUM_IODIDE
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//G4_STILBENE
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//G4_lAr
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//G4_PbWO4
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//G4_Lucite
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nG4Birks = g4MatData.size();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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