Gabriele Cosmo
369 lines
16 KiB
C++
369 lines
16 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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// ----------------------------------------------------------------------------
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//
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//
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// File name: G4GSPWACorrections
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//
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// Author: Mihaly Novak
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//
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// Creation date: 17.10.2017
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//
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// Modifications:
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// 02.02.2018 M.Novak: fixed initialization of first moment correction.
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//
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// Class description: see the header file.
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//
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// -----------------------------------------------------------------------------
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#include "G4GSPWACorrections.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4Log.hh"
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#include "G4Exp.hh"
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#include "G4ProductionCutsTable.hh"
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#include "G4MaterialCutsCouple.hh"
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#include "G4Material.hh"
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#include "G4ElementVector.hh"
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#include "G4Element.hh"
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const std::string G4GSPWACorrections::gElemSymbols[] = {"H","He","Li","Be","B" ,
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"C" ,"N" ,"O" ,"F" ,"Ne","Na","Mg","Al","Si","P" , "S","Cl","Ar","K" ,"Ca","Sc",
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"Ti","V" ,"Cr","Mn","Fe","Co","Ni","Cu","Zn","Ga","Ge","As","Se","Br","Kr","Rb",
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"Sr","Y" ,"Zr","Nb","Mo","Tc","Ru","Rh","Pd","Ag","Cd","In","Sn","Sb","Te","I" ,
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"Xe","Cs","Ba","La","Ce","Pr","Nd","Pm","Sm","Eu","Gd","Tb","Dy","Ho","Er","Tm",
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"Yb","Lu","Hf","Ta","W" ,"Re","Os","Ir","Pt","Au","Hg","Tl","Pb","Bi","Po","At",
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"Rn","Fr","Ra","Ac","Th","Pa","U" ,"Np","Pu","Am","Cm","Bk","Cf"};
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G4GSPWACorrections::G4GSPWACorrections(G4bool iselectron) : fIsElectron(iselectron) {
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// init grids related data member values
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fMaxEkin = CLHEP::electron_mass_c2*(1./std::sqrt(1.-gMaxBeta2)-1.);
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fLogMinEkin = G4Log(gMinEkin);
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fInvLogDelEkin = (gNumEkin-gNumBeta2)/G4Log(gMidEkin/gMinEkin);
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G4double pt2 = gMidEkin*(gMidEkin+2.0*CLHEP::electron_mass_c2);
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fMinBeta2 = pt2/(pt2+CLHEP::electron_mass_c2*CLHEP::electron_mass_c2);
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fInvDelBeta2 = (gNumBeta2-1.)/(gMaxBeta2-fMinBeta2);
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}
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G4GSPWACorrections::~G4GSPWACorrections() {
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ClearDataPerElement();
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ClearDataPerMaterial();
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}
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void G4GSPWACorrections::GetPWACorrectionFactors(G4double logekin, G4double beta2, G4int matindx,
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G4double &corToScr, G4double &corToQ1, G4double &corToG2PerG1) {
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G4int ekinIndxLow = 0;
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G4double remRfaction = 0.;
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if (beta2>=gMaxBeta2) {
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ekinIndxLow = gNumEkin - 1;
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// remRfaction = -1.
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} else if (beta2>=fMinBeta2) { // linear interpolation on \beta^2
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remRfaction = (beta2 - fMinBeta2) * fInvDelBeta2;
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ekinIndxLow = (G4int)remRfaction;
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remRfaction -= ekinIndxLow;
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ekinIndxLow += (gNumEkin - gNumBeta2);
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} else if (logekin>=fLogMinEkin) {
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remRfaction = (logekin - fLogMinEkin) * fInvLogDelEkin;
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ekinIndxLow = (G4int)remRfaction;
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remRfaction -= ekinIndxLow;
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} // the defaults otherwise i.e. use the lowest energy values when ekin is smaller than the minum ekin
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//
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DataPerMaterial *data = fDataPerMaterial[matindx];
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corToScr = data->fCorScreening[ekinIndxLow];
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corToQ1 = data->fCorFirstMoment[ekinIndxLow];
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corToG2PerG1 = data->fCorSecondMoment[ekinIndxLow];
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if (remRfaction>0.) {
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corToScr += remRfaction*(data->fCorScreening[ekinIndxLow+1] - data->fCorScreening[ekinIndxLow]);
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corToQ1 += remRfaction*(data->fCorFirstMoment[ekinIndxLow+1] - data->fCorFirstMoment[ekinIndxLow]);
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corToG2PerG1 += remRfaction*(data->fCorSecondMoment[ekinIndxLow+1] - data->fCorSecondMoment[ekinIndxLow]);
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}
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}
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void G4GSPWACorrections::Initialise() {
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// load PWA correction data for each elements that belongs to materials that are used in the detector
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InitDataPerElement();
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// clear PWA correction data per material
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ClearDataPerMaterial();
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// initialise PWA correction data for the materials that are used in the detector
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InitDataPerMaterials();
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}
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void G4GSPWACorrections::InitDataPerElement() {
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// do it only once
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if (fDataPerElement.size()<gMaxZet+1) {
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fDataPerElement.resize(gMaxZet+1,nullptr);
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}
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// loop over all materials, for those that are used check the list of elements and load data from file if the
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// corresponding data has not been loaded yet
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G4ProductionCutsTable *thePCTable = G4ProductionCutsTable::GetProductionCutsTable();
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size_t numMatCuts = thePCTable->GetTableSize();
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for (size_t imc=0; imc<numMatCuts; ++imc) {
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const G4MaterialCutsCouple *matCut = thePCTable->GetMaterialCutsCouple(imc);
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if (!matCut->IsUsed()) {
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continue;
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}
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const G4Material *mat = matCut->GetMaterial();
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const G4ElementVector *elemVect = mat->GetElementVector();
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//
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size_t numElems = elemVect->size();
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for (size_t ielem=0; ielem<numElems; ++ielem) {
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const G4Element *elem = (*elemVect)[ielem];
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G4int izet = G4lrint(elem->GetZ());
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if (izet>gMaxZet) {
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izet = gMaxZet;
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}
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if (!fDataPerElement[izet]) {
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LoadDataElement(elem);
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}
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}
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}
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}
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void G4GSPWACorrections::InitDataPerMaterials() {
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// prepare size of the container
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size_t numMaterials = G4Material::GetNumberOfMaterials();
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if (fDataPerMaterial.size()!=numMaterials) {
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fDataPerMaterial.resize(numMaterials);
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}
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// init. PWA correction data for the Materials that are used in the geometry
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G4ProductionCutsTable *thePCTable = G4ProductionCutsTable::GetProductionCutsTable();
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size_t numMatCuts = thePCTable->GetTableSize();
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for (size_t imc=0; imc<numMatCuts; ++imc) {
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const G4MaterialCutsCouple *matCut = thePCTable->GetMaterialCutsCouple(imc);
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if (!matCut->IsUsed()) {
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continue;
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}
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const G4Material *mat = matCut->GetMaterial();
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if (!fDataPerMaterial[mat->GetIndex()]) {
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InitDataMaterial(mat);
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}
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}
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}
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// it's called only if data has not been loaded for this element yet
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void G4GSPWACorrections::LoadDataElement(const G4Element *elem) {
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// allocate memory
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G4int izet = elem->GetZasInt();
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if (izet>gMaxZet) {
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izet = gMaxZet;
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}
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// load data from file
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char* tmppath = std::getenv("G4LEDATA");
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if (!tmppath) {
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G4Exception("G4GSPWACorrection::LoadDataElement()","em0006",
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FatalException,
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"Environment variable G4LEDATA not defined");
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return;
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}
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std::string path(tmppath);
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if (fIsElectron) {
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path += "/msc_GS/PWACor/el/";
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} else {
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path += "/msc_GS/PWACor/pos/";
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}
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std::string fname = path+"cf_"+gElemSymbols[izet-1];
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std::ifstream infile(fname,std::ios::in);
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if (!infile.is_open()) {
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std::string msg = " Problem while trying to read " + fname + " data file.\n";
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G4Exception("G4GSPWACorrection::LoadDataElement","em0006", FatalException,msg.c_str());
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return;
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}
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// allocate data structure
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DataPerMaterial *perElem = new DataPerMaterial();
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perElem->fCorScreening.resize(gNumEkin,0.0);
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perElem->fCorFirstMoment.resize(gNumEkin,0.0);
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perElem->fCorSecondMoment.resize(gNumEkin,0.0);
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fDataPerElement[izet] = perElem;
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G4double dum0;
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for (G4int iek=0; iek<gNumEkin; ++iek) {
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infile >> dum0;
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infile >> perElem->fCorScreening[iek];
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infile >> perElem->fCorFirstMoment[iek];
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infile >> perElem->fCorSecondMoment[iek];
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}
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infile.close();
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}
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void G4GSPWACorrections::InitDataMaterial(const G4Material *mat) {
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constexpr G4double const1 = 7821.6; // [cm2/g]
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constexpr G4double const2 = 0.1569; // [cm2 MeV2 / g]
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constexpr G4double finstrc2 = 5.325135453E-5; // fine-structure const. square
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G4double constFactor = CLHEP::electron_mass_c2*CLHEP::fine_structure_const/0.88534;
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constFactor *= constFactor; // (mc^2)^2\alpha^2/( C_{TF}^2)
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// allocate memory
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DataPerMaterial *perMat = new DataPerMaterial();
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perMat->fCorScreening.resize(gNumEkin,0.0);
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perMat->fCorFirstMoment.resize(gNumEkin,0.0);
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perMat->fCorSecondMoment.resize(gNumEkin,0.0);
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fDataPerMaterial[mat->GetIndex()] = perMat;
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//
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const G4ElementVector* elemVect = mat->GetElementVector();
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const G4int numElems = mat->GetNumberOfElements();
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const G4double* nbAtomsPerVolVect = mat->GetVecNbOfAtomsPerVolume();
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G4double totNbAtomsPerVol = mat->GetTotNbOfAtomsPerVolume();
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//
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// 1. Compute material dependent part of Moliere's b_c \chi_c^2
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// (with \xi=1 (i.e. total sub-threshold scattering power correction)
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G4double moliereBc = 0.0;
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G4double moliereXc2 = 0.0;
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G4double zs = 0.0;
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G4double ze = 0.0;
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G4double zx = 0.0;
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G4double sa = 0.0;
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G4double xi = 1.0;
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for (G4int ielem=0; ielem<numElems; ++ielem) {
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G4double zet = (*elemVect)[ielem]->GetZ();
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if (zet>gMaxZet) {
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zet = (G4double)gMaxZet;
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}
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G4double iwa = (*elemVect)[ielem]->GetN();
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G4double ipz = nbAtomsPerVolVect[ielem]/totNbAtomsPerVol;
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G4double dum = ipz*zet*(zet+xi);
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zs += dum;
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ze += dum*(-2.0/3.0)*G4Log(zet);
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zx += dum*G4Log(1.0+3.34*finstrc2*zet*zet);
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sa += ipz*iwa;
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}
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G4double density = mat->GetDensity()*CLHEP::cm3/CLHEP::g; // [g/cm3]
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//
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moliereBc = const1*density*zs/sa*G4Exp(ze/zs)/G4Exp(zx/zs); //[1/cm]
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moliereXc2 = const2*density*zs/sa; // [MeV2/cm]
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// change to Geant4 internal units of 1/length and energ2/length
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moliereBc *= 1.0/CLHEP::cm;
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moliereXc2 *= CLHEP::MeV*CLHEP::MeV/CLHEP::cm;
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//
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// 2. loop over the kinetic energy grid
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for (G4int iek=0; iek<gNumEkin; ++iek) {
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// 2./a. set current kinetic energy and pt2 value
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G4double ekin = G4Exp(fLogMinEkin+iek/fInvLogDelEkin);
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G4double pt2 = ekin*(ekin+2.0*CLHEP::electron_mass_c2);
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if (ekin>gMidEkin) {
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G4double b2 = fMinBeta2+(iek-(gNumEkin-gNumBeta2))/fInvDelBeta2;
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ekin = CLHEP::electron_mass_c2*(1./std::sqrt(1.-b2)-1.);
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pt2 = ekin*(ekin+2.0*CLHEP::electron_mass_c2);
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}
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// 2./b. loop over the elements at the current kinetic energy point
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for (G4int ielem=0; ielem<numElems; ++ielem) {
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const G4Element *elem = (*elemVect)[ielem];
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G4double zet = elem->GetZ();
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if (zet>gMaxZet) {
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zet = (G4double)gMaxZet;
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}
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G4int izet = G4lrint(zet);
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// loaded PWA corrections for the current element
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DataPerMaterial *perElem = fDataPerElement[izet];
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//
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// xi should be one i.e. z(z+1) since total sub-threshold scattering power correction
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G4double nZZPlus1 = nbAtomsPerVolVect[ielem]*zet*(zet+1.0)/totNbAtomsPerVol;
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G4double Z23 = std::pow(zet,2./3.);
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//
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// 2./b./(i) Add the 3 PWA correction factors
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G4double mcScrCF = perElem->fCorScreening[iek]; // \kappa_i[1.13+3.76(\alpha Z_i)^2] with \kappa_i=scr_mc/scr_sr
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// compute the screening parameter correction factor (Z_i contribution to the material)
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// src_{mc} = C \exp\left[ \frac{ \sum_i n_i Z_i(Z_i+1)\ln[Z_{i}^{2/3}\kappa_i(1.13+3.76(\alpha Z_i)^2)] } {\sum_i n_i Z_i(Z_i+1)}
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// with C = \frac{(mc^2)^\alpha^2} {4(pc)^2 C_{TF}^2} = constFactor/(4*(pc)^2)
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// here we compute the \sum_i n_i Z_i(Z_i+1)\ln[Z_{i}^{2/3}\kappa_i(1.13+3.76(\alpha Z_i)^2)] part
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perMat->fCorScreening[iek] += nZZPlus1*G4Log(Z23*mcScrCF);
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// compute the corrected screening parameter for the current Z_i and E_{kin}
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// src(Z_i)_{mc} = \frac{(mc^2)^\alpha^2 Z_i^{2/3}} {4(pc)^2 C_{TF}^2} \kappa_i[1.13+3.76(\alpha Z_i)^2]
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mcScrCF *= constFactor*Z23/(4.*pt2);
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// compute first moment correction factor
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// q1_{mc} = \frac{ \sum_i n_i Z_i(Z_i+1) A_i B_i } {\sum_i n_i Z_i(Z_i+1)} \frac{1}{C}
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// where:
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// A_i(src(Z_i)_{mc}) = [\ln(1+1/src(Z_i)_{mc}) - 1/(1+src(Z_i)_{mc})]; where \sigma(Z_i)_{tr1}^(sr) = A_i(src(Z_i)_{mc}) [2\pi r_0 Z_i mc^2/(pc)\beta]^2
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// B_i = \beta_i \gamma_i with beta_i(Z_i) = \sigma(Z_i)_{tr1}^(PWA)/\sigma(Z_i,src(Z_i)_{mc})_{tr1}^(sr)
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// and \gamma_i = \sigma(Z_i)_{el}^(MC-DCS)/\sigma(Z_i,src(Z_i)_{mc})_{el}^(sr)
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// C(src_{mc}) = [\ln(1+1/src_{mc}) - 1/(1+src_{mc})]; where \sigma_{tr1}^(sr) = C(src_{mc}) [2\pi r_0 Z_i mc^2/(pc)\beta]^2
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// A_i x B_i is stored in file per e-/e+, E_{kin} and Z_i
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// here we compute the \sum_i n_i Z_i(Z_i+1) A_i B_i part
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perMat->fCorFirstMoment[iek] += nZZPlus1*(G4Log(1.+1./mcScrCF)-1./(1.+mcScrCF))*perElem->fCorFirstMoment[iek];
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// compute the second moment correction factor
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// [G2/G1]_{mc} = \frac{ \sum_i n_i Z_i(Z_i+1) A_i } {\sum_i n_i Z_i(Z_i+1)} \frac{1}{C}
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// with A_i(Z_i) = G2(Z_i)^{PWA}/G1(Z_i)^{PWA} and C=G2(Z_i,scr_{mc})^{sr}/G1(Z_i,scr_{mc})^{sr}}
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// here we compute the \sum_i n_i Z_i(Z_i+1) A_i part
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perMat->fCorSecondMoment[iek] += nZZPlus1*perElem->fCorSecondMoment[iek];
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//
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// 2./b./(ii) When the last element has been added:
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if (ielem==numElems-1) {
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//
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// 1. the remaining part of the sreening correction and divide the corrected screening par. with Moliere's one:
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// (Moliere screening parameter = moliereXc2/(4(pc)^2 moliereBc) )
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G4double dumScr = G4Exp(perMat->fCorScreening[iek]/zs);
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perMat->fCorScreening[iek] = constFactor*dumScr*moliereBc/moliereXc2;
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//
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// 2. the remaining part of the first moment correction and divide by the one computed by using the corrected
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// screening parameter (= (mc^2)^\alpha^2/(4(pc)^2C_{TF}^2) dumScr
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G4double scrCorTed = constFactor*dumScr/(4.*pt2);
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G4double dum0 = G4Log(1.+1./scrCorTed);
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perMat->fCorFirstMoment[iek] = perMat->fCorFirstMoment[iek]/(zs*(dum0-1./(1.+scrCorTed)));
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//
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// 3. the remaining part of the second moment correction and divide by the one computed by using the corrected
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// screening parameter
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G4double G2PerG1 = 3.*(1.+scrCorTed)*((1.+2.*scrCorTed)*dum0-2.)/((1.+scrCorTed)*dum0-1.);
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perMat->fCorSecondMoment[iek] = perMat->fCorSecondMoment[iek]/(zs*G2PerG1);
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}
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}
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}
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}
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void G4GSPWACorrections::ClearDataPerElement() {
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for (size_t i=0; i<fDataPerElement.size(); ++i) {
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if (fDataPerElement[i]) {
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fDataPerElement[i]->fCorScreening.clear();
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fDataPerElement[i]->fCorFirstMoment.clear();
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fDataPerElement[i]->fCorSecondMoment.clear();
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delete fDataPerElement[i];
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}
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}
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fDataPerElement.clear();
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}
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void G4GSPWACorrections::ClearDataPerMaterial() {
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for (size_t i=0; i<fDataPerMaterial.size(); ++i) {
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if (fDataPerMaterial[i]) {
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fDataPerMaterial[i]->fCorScreening.clear();
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fDataPerMaterial[i]->fCorFirstMoment.clear();
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fDataPerMaterial[i]->fCorSecondMoment.clear();
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delete fDataPerMaterial[i];
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}
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}
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fDataPerMaterial.clear();
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}
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