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80e2389dd8fbe88e4127f9df638bfd4fe8d10040
geant4/source/processes/electromagnetic/standard/src/G4PAIModelData.cc
T
Gabriele Cosmo 80e2389dd8 Import Geant4 11.0.0 source tree
2021-12-10 16:15:15 +00:00

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//
// ********************************************************************
// * 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 name: G4PAIModelData.cc
//
// Author: V. Ivanchenko based on V.Grichine code of G4PAIModel
//
// Creation date: 16.08.2013
//
// Modifications:
//
#include "G4PAIModelData.hh"
#include "G4PAIModel.hh"
#include "G4SystemOfUnits.hh"
#include "G4PhysicalConstants.hh"
#include "G4PhysicsLogVector.hh"
#include "G4PhysicsFreeVector.hh"
#include "G4PhysicsTable.hh"
#include "G4MaterialCutsCouple.hh"
#include "G4SandiaTable.hh"
#include "Randomize.hh"
#include "G4Poisson.hh"
////////////////////////////////////////////////////////////////////////
using namespace std;
G4PAIModelData::G4PAIModelData(G4double tmin, G4double tmax, G4int ver)
{
const G4int nPerDecade = 10;
const G4double lowestTkin = 50*keV;
const G4double highestTkin = 10*TeV;
fPAIySection.SetVerbose(ver);
fLowestKineticEnergy = std::max(tmin, lowestTkin);
fHighestKineticEnergy = tmax;
if(tmax < 10*fLowestKineticEnergy) {
fHighestKineticEnergy = 10*fLowestKineticEnergy;
} else if(tmax > highestTkin) {
fHighestKineticEnergy = std::max(highestTkin, 10*fLowestKineticEnergy);
}
fTotBin = (G4int)(nPerDecade*
std::log10(fHighestKineticEnergy/fLowestKineticEnergy));
fParticleEnergyVector = new G4PhysicsLogVector(fLowestKineticEnergy,
fHighestKineticEnergy,
fTotBin);
if(0 < ver) {
G4cout << "### G4PAIModelData: Nbins= " << fTotBin
<< " Tlowest(keV)= " << lowestTkin/keV
<< " Tmin(keV)= " << fLowestKineticEnergy/keV
<< " Tmax(GeV)= " << fHighestKineticEnergy/GeV
<< G4endl;
}
}
////////////////////////////////////////////////////////////////////////////
G4PAIModelData::~G4PAIModelData()
{
size_t n = fPAIxscBank.size();
if(0 < n) {
for(size_t i=0; i<n; ++i) {
if(fPAIxscBank[i]) {
fPAIxscBank[i]->clearAndDestroy();
delete fPAIxscBank[i];
}
if(fPAIdEdxBank[i]) {
fPAIdEdxBank[i]->clearAndDestroy();
delete fPAIdEdxBank[i];
}
delete fdEdxTable[i];
}
}
delete fParticleEnergyVector;
}
///////////////////////////////////////////////////////////////////////////////
void G4PAIModelData::Initialise(const G4MaterialCutsCouple* couple,
G4PAIModel* model)
{
const G4Material* mat = couple->GetMaterial();
fSandia.Initialize(const_cast<G4Material*>(mat));
G4PhysicsTable* PAItransferTable = new G4PhysicsTable(fTotBin+1);
G4PhysicsTable* PAIdEdxTable = new G4PhysicsTable(fTotBin+1);
G4PhysicsLogVector* dEdxMeanVector =
new G4PhysicsLogVector(fLowestKineticEnergy,
fHighestKineticEnergy,
fTotBin);
// low energy Sandia interval
G4double Tmin = fSandia.GetSandiaMatTablePAI(0,0);
// energy safety
static const G4double deltaLow = 100.*eV;
for (G4int i = 0; i <= fTotBin; ++i) {
G4double kinEnergy = fParticleEnergyVector->Energy(i);
G4double Tmax = model->ComputeMaxEnergy(kinEnergy);
G4double tau = kinEnergy/proton_mass_c2;
G4double bg2 = tau*( tau + 2. );
if (Tmax < Tmin + deltaLow ) { Tmax = Tmin + deltaLow; }
fPAIySection.Initialize(mat, Tmax, bg2, &fSandia);
//G4cout << i << ". TransferMax(keV)= "<< Tmax/keV
// << " E(MeV)= " << kinEnergy/MeV << G4endl;
G4int n = fPAIySection.GetSplineSize();
G4int kmin = 0;
for(G4int k = 0; k < n; ++k) {
if(fPAIySection.GetIntegralPAIySection(k+1) <= 0.0) {
kmin = k;
} else {
break;
}
}
n -= kmin;
G4PhysicsFreeVector* transferVector = new G4PhysicsFreeVector(n);
G4PhysicsFreeVector* dEdxVector = new G4PhysicsFreeVector(n);
//G4double tr0 = 0.0;
G4double tr = 0.0;
for(G4int k = kmin; k < n; ++k)
{
G4double t = fPAIySection.GetSplineEnergy(k+1);
tr = fPAIySection.GetIntegralPAIySection(k+1);
//if(tr >= tr0) { tr0 = tr; }
//else { G4cout << "G4PAIModelData::Initialise Warning: Ekin(MeV)= "
// << t/MeV << " IntegralTransfer= " << tr
// << " < " << tr0 << G4endl; }
transferVector->PutValue(k, t, t*tr);
dEdxVector->PutValue(k, t, fPAIySection.GetIntegralPAIdEdx(k+1));
}
//G4cout << "TransferVector:" << G4endl;
//G4cout << *transferVector << G4endl;
//G4cout << "DEDXVector:" << G4endl;
//G4cout << *dEdxVector << G4endl;
G4double ionloss = fPAIySection.GetMeanEnergyLoss();// total <dE/dx>
if(ionloss < 0.0) ionloss = 0.0;
dEdxMeanVector->PutValue(i,ionloss);
PAItransferTable->insertAt(i,transferVector);
PAIdEdxTable->insertAt(i,dEdxVector);
} // end of Tkin loop`
fPAIxscBank.push_back(PAItransferTable);
fPAIdEdxBank.push_back(PAIdEdxTable);
//G4cout << "dEdxMeanVector: " << G4endl;
//G4cout << *dEdxMeanVector << G4endl;
fdEdxTable.push_back(dEdxMeanVector);
}
//////////////////////////////////////////////////////////////////////////////
G4double G4PAIModelData::DEDXPerVolume(G4int coupleIndex, G4double scaledTkin,
G4double cut) const
{
// VI: iPlace is the low edge index of the bin
// iPlace is in interval from 0 to (N-1)
size_t iPlace(0);
G4double dEdx = fdEdxTable[coupleIndex]->Value(scaledTkin, iPlace);
size_t nPlace = fParticleEnergyVector->GetVectorLength() - 1;
/*
G4cout << "G4PAIModelData::DEDXPerVolume: coupleIdx= " << coupleIndex
<< " Tscaled= " << scaledTkin << " cut= " << cut
<< " iPlace= " << iPlace << " nPlace= " << nPlace << G4endl;
*/
G4bool one = true;
if(scaledTkin >= fParticleEnergyVector->Energy(nPlace)) { iPlace = nPlace; }
else if(scaledTkin > fParticleEnergyVector->Energy(0)) {
one = false;
}
// VI: apply interpolation of the vector
G4double del = (*(fPAIdEdxBank[coupleIndex]))(iPlace)->Value(cut);
//G4cout << "dEdx= " << dEdx << " del= " << del << G4endl;
if(!one) {
G4double del2 = (*(fPAIdEdxBank[coupleIndex]))(iPlace+1)->Value(cut);
G4double E1 = fParticleEnergyVector->Energy(iPlace);
G4double E2 = fParticleEnergyVector->Energy(iPlace+1);
G4double W = 1.0/(E2 - E1);
G4double W1 = (E2 - scaledTkin)*W;
G4double W2 = (scaledTkin - E1)*W;
del *= W1;
del += W2*del2;
}
dEdx -= del;
//G4cout << "dEdx= " << dEdx << " del= " << del << G4endl;
dEdx = std::max(dEdx, 0.);
return dEdx;
}
/////////////////////////////////////////////////////////////////////////
G4double
G4PAIModelData::CrossSectionPerVolume(G4int coupleIndex,
G4double scaledTkin,
G4double tcut, G4double tmax) const
{
G4double cross, cross1, cross2;
// iPlace is in interval from 0 to (N-1)
size_t iPlace = fParticleEnergyVector->FindBin(scaledTkin, 0);
size_t nPlace = fParticleEnergyVector->GetVectorLength() - 1;
G4bool one = true;
if(scaledTkin >= fParticleEnergyVector->Energy(nPlace)) { iPlace = nPlace; }
else if(scaledTkin > fParticleEnergyVector->Energy(0)) {
one = false;
}
G4PhysicsTable* table = fPAIxscBank[coupleIndex];
//G4cout<<"iPlace = "<<iPlace<<"; tmax = "
// <<tmax<<"; cutEnergy = "<<cutEnergy<<G4endl;
cross1 = (*table)(iPlace)->Value(tmax)/tmax;
//G4cout<<"cross1 = "<<cross1<<G4endl;
cross2 = (*table)(iPlace)->Value(tcut)/tcut;
//G4cout<<"cross2 = "<<cross2<<G4endl;
cross = (cross2-cross1);
//G4cout<<"cross = "<<cross<<G4endl;
if(!one) {
cross2 = (*table)(iPlace+1)->Value(tcut)/tcut
- (*table)(iPlace+1)->Value(tmax)/tmax;
G4double E1 = fParticleEnergyVector->Energy(iPlace);
G4double E2 = fParticleEnergyVector->Energy(iPlace+1);
G4double W = 1.0/(E2 - E1);
G4double W1 = (E2 - scaledTkin)*W;
G4double W2 = (scaledTkin - E1)*W;
cross *= W1;
cross += W2*cross2;
}
cross = std::max(cross, 0.0);
return cross;
}
///////////////////////////////////////////////////////////////////////
G4double G4PAIModelData::SampleAlongStepTransfer(G4int coupleIndex,
G4double kinEnergy,
G4double scaledTkin,
G4double tmax,
G4double stepFactor) const
{
//G4cout << "=== G4PAIModelData::SampleAlongStepTransfer" << G4endl;
G4double loss = 0.0;
size_t iPlace = fParticleEnergyVector->FindBin(scaledTkin, 0);
size_t nPlace = fParticleEnergyVector->GetVectorLength() - 1;
G4bool one = true;
if(scaledTkin >= fParticleEnergyVector->Energy(nPlace)) { iPlace = nPlace; }
else if(scaledTkin > fParticleEnergyVector->Energy(0)) {
one = false;
}
G4double meanNumber = 0.0;
G4double meanN11 = 0.0;
G4double meanN12 = 0.0;
G4double meanN21 = 0.0;
G4double meanN22 = 0.0;
G4PhysicsVector* v1 = (*(fPAIxscBank[coupleIndex]))(iPlace);
G4PhysicsVector* v2 = 0;
G4double e1 = v1->Energy(0);
G4double e2 = std::min(tmax, v1->GetMaxEnergy());
if(e2 >= e1) {
meanN11 = (*v1)[0]/e1;
meanN12 = v1->Value(e2)/e2;
meanNumber = (meanN11 - meanN12)*stepFactor;
}
//G4cout<<"iPlace = "<<iPlace<< " meanN11= " << meanN11
// << " meanN12= " << meanN12 << G4endl;
G4double W1 = 1.0;
G4double W2 = 0.0;
if(!one) {
v2 = (*(fPAIxscBank[coupleIndex]))(iPlace+1);
e1 = v2->Energy(0);
e2 = std::min(tmax, v2->GetMaxEnergy());
if(e2 >= e1) {
meanN21 = (*v2)[0]/e1;
meanN22 = v2->Value(e2)/e2;
G4double E1 = fParticleEnergyVector->Energy(iPlace);
G4double E2 = fParticleEnergyVector->Energy(iPlace+1);
G4double W = 1.0/(E2 - E1);
W1 = (E2 - scaledTkin)*W;
W2 = (scaledTkin - E1)*W;
meanNumber *= W1;
meanNumber += (meanN21 - meanN22)*stepFactor*W2;
}
}
if(meanNumber < 0.0) { return loss; }
G4int numOfCollisions = G4Poisson(meanNumber);
//G4cout << "meanNumber= " << meanNumber << " N= " << numOfCollisions << G4endl;
if(0 == numOfCollisions) { return loss; }
G4double position, omega, omega2;
for(G4int i=0; i< numOfCollisions; ++i) {
G4double rand = G4UniformRand();
position = meanN12 + (meanN11 - meanN12)*rand;
omega = GetEnergyTransfer(coupleIndex, iPlace, position);
//G4cout << "omega(keV)= " << omega/keV << G4endl;
if(!one) {
position = meanN22 + (meanN21 - meanN22)*rand;
omega2 = GetEnergyTransfer(coupleIndex, iPlace+1, position);
omega *= W1;
omega += omega2*W2;
}
//G4cout << "omega(keV)= " << omega/keV << G4endl;
loss += omega;
if(loss > kinEnergy) { break; }
}
//G4cout<<"PAIModelData AlongStepLoss = "<<loss/keV<<" keV"<<G4endl;
if(loss > kinEnergy) { loss = kinEnergy; }
else if(loss < 0.) { loss = 0.; }
return loss;
}
///////////////////////////////////////////////////////////////////////
//
// Returns post step PAI energy transfer > cut electron energy
// according to passed scaled kinetic energy of particle
G4double G4PAIModelData::SamplePostStepTransfer(G4int coupleIndex,
G4double scaledTkin,
G4double tmin,
G4double tmax) const
{
//G4cout<<"=== G4PAIModelData::SamplePostStepTransfer idx= "<< coupleIndex
// << " Tkin= " << scaledTkin << " Tmax= " << tmax << G4endl;
G4double transfer = 0.0;
G4double rand = G4UniformRand();
size_t nPlace = fParticleEnergyVector->GetVectorLength() - 1;
size_t iPlace = fParticleEnergyVector->FindBin(scaledTkin, 0);
G4bool one = true;
if(scaledTkin >= fParticleEnergyVector->Energy(nPlace)) { iPlace = nPlace; }
else if(scaledTkin > fParticleEnergyVector->Energy(0)) {
one = false;
}
G4PhysicsTable* table = fPAIxscBank[coupleIndex];
G4PhysicsVector* v1 = (*table)[iPlace];
G4double emin = std::max(tmin, v1->Energy(0));
G4double emax = std::min(tmax, v1->GetMaxEnergy());
if(emax < emin) { return transfer; }
G4double dNdx1 = v1->Value(emin)/emin;
G4double dNdx2 = v1->Value(emax)/emax;
/*
G4cout << "iPlace= " << iPlace << " nPlace= " << nPlace
<< " emin= " << emin << " emax= " << emax
<< " dNdx1= " << dNdx1 << " dNdx2= " << dNdx2
<< " one: " << one << G4endl;
*/
G4double position = dNdx2 + (dNdx1 - dNdx2)*rand;
transfer = GetEnergyTransfer(coupleIndex, iPlace, position);
//G4cout<<"PAImodel PostStepTransfer = "<<transfer/keV<<" keV"
// << " position= " << position << G4endl;
if(!one) {
G4PhysicsVector* v2 = (*table)[iPlace+1];
emin = std::max(tmin, v2->Energy(0));
emax = std::min(tmax, v2->GetMaxEnergy());
if(emin <= emax) {
dNdx1 = v2->Value(emin)/emin;
dNdx2 = v2->Value(emax)/emax;
//G4cout << " emax2= " << emax
// << " dNdx2= " << dNdx2 << " dNdx1= " << dNdx1 << G4endl;
G4double E1 = fParticleEnergyVector->Energy(iPlace);
G4double E2 = fParticleEnergyVector->Energy(iPlace+1);
G4double W = 1.0/(E2 - E1);
G4double W1 = (E2 - scaledTkin)*W;
G4double W2 = (scaledTkin - E1)*W;
//G4cout<< "E1= " << E1 << " E2= " << E2 <<" iPlace= " << iPlace
// << " W1= " << W1 << " W2= " << W2 <<G4endl;
position = dNdx2 + (dNdx1 - dNdx2)*rand;
G4double tr2 = GetEnergyTransfer(coupleIndex, iPlace+1, position);
//G4cout<<"PAImodel PostStepTransfer1 = "<<tr2/keV<<" keV"
// << " position= " << position << G4endl;
transfer *= W1;
transfer += tr2*W2;
}
}
//G4cout<<"PAImodel PostStepTransfer = "<<transfer/keV<<" keV"
// << " position= " << position << G4endl;
transfer = std::max(transfer, 0.0);
return transfer;
}
///////////////////////////////////////////////////////////////////////
//
// Returns PAI energy transfer according to passed
// indexes of particle kinetic enegry and random x-section
G4double G4PAIModelData::GetEnergyTransfer(G4int coupleIndex,
size_t iPlace,
G4double position) const
{
G4PhysicsVector* v = (*(fPAIxscBank[coupleIndex]))(iPlace);
if(position*v->Energy(0) >= (*v)[0]) { return v->Energy(0); }
size_t iTransferMax = v->GetVectorLength() - 1;
size_t iTransfer;
G4double x1(0.0), x2(0.0), y1(0.0), y2(0.0), energyTransfer;
//G4cout << "iPlace= " << iPlace << " iTransferMax= " << iTransferMax << G4endl;
for(iTransfer=1; iTransfer<=iTransferMax; ++iTransfer) {
x2 = v->Energy(iTransfer);
y2 = (*v)[iTransfer]/x2;
if(position >= y2) { break; }
if(iTransfer == iTransferMax) { return v->GetMaxEnergy(); }
}
x1 = v->Energy(iTransfer-1);
y1 = (*v)[iTransfer-1]/x1;
/*
G4cout << "i= " << iTransfer << " imax= " << iTransferMax
<< " x1= " << x1 << " x2= " << x2
<< " y1= " << y1 << " y2= " << y2 << G4endl;
*/
energyTransfer = x1;
if ( x1 != x2 ) {
if ( y1 == y2 ) {
energyTransfer += (x2 - x1)*G4UniformRand();
} else {
if(x1*1.1 < x2) {
const G4int nbins = 5;
G4double del = (x2 - x1)/G4int(nbins);
x2 = x1;
for(G4int i=1; i<=nbins; ++i) {
x2 += del;
y2 = v->Value(x2)/x2;
if(position >= y2) {
break;
}
x1 = x2;
y1 = y2;
}
}
//G4cout << "x1(keV)= " << x1/keV << " x2(keV)= " << x2/keV
// << " y1= " << y1 << " y2= " << y2 << " pos= " << position << G4endl;
energyTransfer = (y2 - y1)*x1*x2/(position*(x1 - x2) - y1*x1 + y2*x2);
}
}
//G4cout << "x1(keV)= " << x1/keV << " x2(keV)= " << x2/keV
// << " y1= " << y1 << " y2= " << y2 << " pos= " << position
// << " E(keV)= " << energyTransfer/keV << G4endl;
return energyTransfer;
}
//////////////////////////////////////////////////////////////////////
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