Gabriele Cosmo
191 lines
6.8 KiB
C++
191 lines
6.8 KiB
C++
//
|
|
// ********************************************************************
|
|
// * License and Disclaimer *
|
|
// * *
|
|
// * The Geant4 software is copyright of the Copyright Holders of *
|
|
// * the Geant4 Collaboration. It is provided under the terms and *
|
|
// * conditions of the Geant4 Software License, included in the file *
|
|
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
|
// * include a list of copyright holders. *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. Please see the license in the file LICENSE and URL above *
|
|
// * for the full disclaimer and the limitation of liability. *
|
|
// * *
|
|
// * This code implementation is the result of the scientific and *
|
|
// * technical work of the GEANT4 collaboration. *
|
|
// * By using, copying, modifying or distributing the software (or *
|
|
// * any work based on the software) you agree to acknowledge its *
|
|
// * use in resulting scientific publications, and indicate your *
|
|
// * acceptance of all terms of the Geant4 Software license. *
|
|
// ********************************************************************
|
|
//
|
|
//
|
|
// -------------------------------------------------------------------
|
|
//
|
|
// GEANT4 Class file
|
|
//
|
|
//
|
|
// File name: G4CoulombScattering
|
|
//
|
|
// Author: Vladimir Ivanchenko
|
|
//
|
|
// Creation date: 22.08.2004
|
|
//
|
|
// Modifications:
|
|
// 01.08.06 V.Ivanchenko add choice between G4eCoulombScatteringModel and
|
|
// G4CoulombScatteringModel
|
|
//
|
|
|
|
//
|
|
// -------------------------------------------------------------------
|
|
//
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
#include "G4CoulombScattering.hh"
|
|
#include "G4SystemOfUnits.hh"
|
|
#include "G4eCoulombScatteringModel.hh"
|
|
#include "G4IonCoulombScatteringModel.hh"
|
|
#include "G4Proton.hh"
|
|
#include "G4EmParameters.hh"
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
using namespace std;
|
|
|
|
G4CoulombScattering::G4CoulombScattering(const G4String& name)
|
|
: G4VEmProcess(name),q2Max(CLHEP::TeV*CLHEP::TeV),isInitialised(false)
|
|
{
|
|
// G4cout << "G4CoulombScattering constructor "<< G4endl;
|
|
SetBuildTableFlag(true);
|
|
SetStartFromNullFlag(false);
|
|
SetSplineFlag(false);
|
|
SetCrossSectionType(fEmOnePeak);
|
|
SetSecondaryParticle(G4Proton::Proton());
|
|
SetProcessSubType(fCoulombScattering);
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
G4CoulombScattering::~G4CoulombScattering() = default;
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
G4bool G4CoulombScattering::IsApplicable(const G4ParticleDefinition& p)
|
|
{
|
|
return (p.GetPDGCharge() != 0.0);
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
void G4CoulombScattering::InitialiseProcess(const G4ParticleDefinition* p)
|
|
{
|
|
// second initialisation not allowed for the time being
|
|
// this means that polar angle limit change will not be appled
|
|
// after first initialisation
|
|
if(isInitialised) { return; }
|
|
|
|
G4EmParameters* param = G4EmParameters::Instance();
|
|
G4double a = param->FactorForAngleLimit()*CLHEP::hbarc/CLHEP::fermi;
|
|
q2Max = 0.5*a*a;
|
|
G4double theta = param->MscThetaLimit();
|
|
|
|
// restricted or non-restricted cross section table
|
|
G4bool yes = false;
|
|
if(theta == CLHEP::pi) {
|
|
yes = true;
|
|
// for restriced single scattering change cross section shape
|
|
SetCrossSectionType(fEmIncreasing);
|
|
}
|
|
SetStartFromNullFlag(yes);
|
|
/*
|
|
G4cout << "### G4CoulombScattering::InitialiseProcess: "
|
|
<< p->GetParticleName()
|
|
<< " Emin(MeV)= " << MinKinEnergy()/MeV
|
|
<< " Emax(TeV)= " << MaxKinEnergy()/TeV
|
|
<< " nbins= " << LambdaBinning()
|
|
<< " theta= " << theta
|
|
<< G4endl;
|
|
*/
|
|
|
|
isInitialised = true;
|
|
G4double mass = p->GetPDGMass();
|
|
G4String name = p->GetParticleName();
|
|
//G4cout << name << " type: " << p->GetParticleType()
|
|
//<< " mass= " << mass << G4endl;
|
|
yes = true;
|
|
if (mass > CLHEP::GeV || p->GetParticleType() == "nucleus") {
|
|
SetBuildTableFlag(false);
|
|
yes = false;
|
|
if(name != "GenericIon") { SetVerboseLevel(0); }
|
|
} else {
|
|
if(name != "e-" && name != "e+" &&
|
|
name != "mu+" && name != "mu-" && name != "pi+" &&
|
|
name != "kaon+" && name != "proton" ) { SetVerboseLevel(0); }
|
|
}
|
|
|
|
if(nullptr == EmModel(0)) {
|
|
if(yes) { SetEmModel(new G4eCoulombScatteringModel()); }
|
|
else { SetEmModel(new G4IonCoulombScatteringModel()); }
|
|
}
|
|
G4VEmModel* model = EmModel(0);
|
|
G4double emin = std::max(param->MinKinEnergy(),model->LowEnergyLimit());
|
|
G4double emax = std::min(param->MaxKinEnergy(),model->HighEnergyLimit());
|
|
model->SetPolarAngleLimit(theta);
|
|
model->SetLowEnergyLimit(emin);
|
|
model->SetHighEnergyLimit(emax);
|
|
AddEmModel(1, model);
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
G4double G4CoulombScattering::MinPrimaryEnergy(const G4ParticleDefinition* part,
|
|
const G4Material* mat)
|
|
{
|
|
// Pure Coulomb scattering
|
|
G4double emin = 0.0;
|
|
|
|
// Coulomb scattering combined with multiple or hadronic scattering
|
|
G4double theta = G4EmParameters::Instance()->MscThetaLimit();
|
|
|
|
if(0.0 < theta) {
|
|
G4double p2 = q2Max*mat->GetIonisation()->GetInvA23()/(1.0 - cos(theta));
|
|
G4double mass = part->GetPDGMass();
|
|
emin = sqrt(p2 + mass*mass) - mass;
|
|
}
|
|
|
|
return emin;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
void G4CoulombScattering::StreamProcessInfo(std::ostream& outFile) const
|
|
{
|
|
G4double tetmin = G4EmParameters::Instance()->MscThetaLimit()/CLHEP::degree;
|
|
outFile << " ";
|
|
if(tetmin > 179.) { outFile << "ThetaMin(p)"; }
|
|
else { outFile << tetmin; }
|
|
outFile << " < Theta(degree) < 180";
|
|
|
|
if(q2Max < DBL_MAX) { outFile << "; pLimit(GeV^1)= " << sqrt(q2Max)/GeV; }
|
|
outFile << G4endl;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
void G4CoulombScattering::ProcessDescription(std::ostream& out) const
|
|
{
|
|
out <<
|
|
" Coulomb scattering. Simulation of elastic scattering\n" <<
|
|
" events individually. May be used in combination with multiple\n" <<
|
|
" scattering, where Coulomb scattering is used for hard (large angle)\n" <<
|
|
" collisions and multiple scattering for soft collisions.";
|
|
G4VEmProcess::ProcessDescription(out);
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|