Gabriele Cosmo
215 lines
7.1 KiB
C++
215 lines
7.1 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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#include "globals.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4CollisionComposite.hh"
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#include "G4VCollision.hh"
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#include "G4CollisionVector.hh"
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#include "G4KineticTrack.hh"
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#include "G4KineticTrackVector.hh"
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#include "G4VCrossSectionSource.hh"
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#include "G4HadTmpUtil.hh"
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#include "G4AutoLock.hh"
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const G4int G4CollisionComposite::nPoints = 32;
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const G4double G4CollisionComposite::theT[nPoints] =
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{.01, .03, .05, .1, .15, .2, .3, .4, .5, .6, .7, .8, .9, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.5, 3.0, 3.5, 4.0, 5.0, 6.0, 8.0, 10., 15, 20, 50, 100};
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G4CollisionComposite::G4CollisionComposite()
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{
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G4MUTEXINIT( bufferMutex );
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}
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G4CollisionComposite::~G4CollisionComposite()
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{
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G4MUTEXDESTROY(bufferMutex);
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std::for_each(components.begin(), components.end(), G4Delete());
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}
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G4double G4CollisionComposite::CrossSection(const G4KineticTrack& trk1,
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const G4KineticTrack& trk2) const
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{
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G4double crossSect = 0.;
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const G4VCrossSectionSource* xSource = GetCrossSectionSource();
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if (xSource != 0)
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// There is a total cross section for this Collision
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{
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crossSect = xSource->CrossSection(trk1,trk2);
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}
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else
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{
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G4AutoLock l(&bufferMutex);
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// waiting for mutable to enable buffering.
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const_cast<G4CollisionComposite *>(this)->BufferCrossSection(trk1.GetDefinition(), trk2.GetDefinition());
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// G4cerr << "Buffer filled, reying with sqrts = "<< (trk1.Get4Momentum()+trk2.Get4Momentum()).mag() <<G4endl;
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crossSect = BufferedCrossSection(trk1,trk2);
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}
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return crossSect;
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}
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G4KineticTrackVector* G4CollisionComposite::FinalState(const G4KineticTrack& trk1,
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const G4KineticTrack& trk2) const
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{
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std::vector<G4double> cxCache;
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G4double partialCxSum = 0.0;
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size_t i;
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for (i=0; i<components.size(); i++)
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{
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G4double partialCx;
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// cout << "comp" << i << " " << components[i]()->GetName();
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if (components[i]->IsInCharge(trk1,trk2))
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{
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partialCx = components[i]->CrossSection(trk1,trk2);
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}
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else
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{
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partialCx = 0.0;
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}
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// cout << " cx=" << partialCx << endl;
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partialCxSum += partialCx;
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cxCache.push_back(partialCx);
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}
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G4double random = G4UniformRand()*partialCxSum;
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G4double running = 0;
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for (i=0; i<cxCache.size(); i++)
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{
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running += cxCache[i];
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if (running > random)
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{
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return components[i]->FinalState(trk1, trk2);
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}
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}
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// G4cerr <<"in charge = "<<IsInCharge(trk1, trk2)<<G4endl;
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// G4cerr <<"Cross-section = "<<CrossSection(trk1, trk2)/millibarn<<" "<<running<<" "<<cxCache.size()<<G4endl;
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// G4cerr <<"Names = "<<trk1.GetDefinition()->GetParticleName()<<", "<<trk2.GetDefinition()->GetParticleName()<<G4endl;
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// throw G4HadronicException(__FILE__, __LINE__, "G4CollisionComposite: no final state found!");
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return NULL;
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}
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G4bool G4CollisionComposite::IsInCharge(const G4KineticTrack& trk1,
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const G4KineticTrack& trk2) const
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{
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G4bool isInCharge = false;
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// The composite is in charge if any of its components is in charge
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const G4CollisionVector* comps = GetComponents();
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if (comps)
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{
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G4CollisionVector::const_iterator iter;
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for (iter = comps->begin(); iter != comps->end(); ++iter)
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{
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if ( ((*iter))->IsInCharge(trk1,trk2) ) isInCharge = true;
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}
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}
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return isInCharge;
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}
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void G4CollisionComposite::
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BufferCrossSection(const G4ParticleDefinition * aP, const G4ParticleDefinition * bP)
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{
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// check if already buffered
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size_t i;
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for(i=0; i<theBuffer.size(); i++)
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{
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if(theBuffer[i].InCharge(aP, bP)) return;
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}
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// G4cerr << "Buffering for "<<aP->GetParticleName()<<" "<<bP->GetParticleName()<<G4endl;
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// buffer the new one.
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G4CrossSectionBuffer aNewBuff(aP, bP);
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size_t maxE=nPoints;
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for(size_t tt=0; tt<maxE; tt++)
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{
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G4double aT = theT[tt]*GeV;
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G4double crossSect = 0;
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// The total cross-section is summed over all the component channels
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//A.R. 28-Sep-2012 Fix reproducibility problem
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// Assign the kinetic energy to the lightest of the
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// two particles, instead to the first one always.
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G4double atime = 0;
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G4double btime = 0;
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G4ThreeVector aPosition(0,0,0);
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G4ThreeVector bPosition(0,0,0);
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G4double aM = aP->GetPDGMass();
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G4double bM = bP->GetPDGMass();
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G4double aE = aM;
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G4double bE = bM;
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G4ThreeVector aMom(0,0,0);
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G4ThreeVector bMom(0,0,0);
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if ( aM <= bM ) {
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aE += aT;
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aMom = G4ThreeVector(0,0,std::sqrt(aE*aE-aM*aM));
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} else {
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bE += aT;
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bMom = G4ThreeVector(0,0,std::sqrt(bE*bE-bM*bM));
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}
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G4LorentzVector a4Momentum(aE, aMom);
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G4LorentzVector b4Momentum(bE, bMom);
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G4KineticTrack a(aP, atime, aPosition, a4Momentum);
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G4KineticTrack b(bP, btime, bPosition, b4Momentum);
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for (i=0; i<components.size(); i++)
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{
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if(components[i]->IsInCharge(a,b))
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{
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crossSect += components[i]->CrossSection(a,b);
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}
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}
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G4double sqrts = (a4Momentum+b4Momentum).mag();
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aNewBuff.push_back(sqrts, crossSect);
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}
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theBuffer.push_back(std::move(aNewBuff));
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// theBuffer.back().Print();
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}
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G4double G4CollisionComposite::
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BufferedCrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
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{
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for(size_t i=0; i<theBuffer.size(); i++)
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{
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if(theBuffer[i].InCharge(trk1.GetDefinition(), trk2.GetDefinition()))
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{
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return theBuffer[i].CrossSection(trk1, trk2);
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}
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}
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throw G4HadronicException(__FILE__, __LINE__, "G4CollisionComposite::BufferedCrossSection - Blitz !!");
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return 0;
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}
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