DummyChargeFlipProcess.cc

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#include <iostream>
#include "G4ParticleTable.hh"
#include "Randomize.hh"

#include "SimG4Core/CustomPhysics/interface/DummyChargeFlipProcess.h"

using namespace CLHEP;

DummyChargeFlipProcess::DummyChargeFlipProcess(const G4String& processName) : G4HadronicProcess(processName) {
  AddDataSet(new G4HadronElasticDataSet);
}

DummyChargeFlipProcess::~DummyChargeFlipProcess() {}

void DummyChargeFlipProcess::BuildPhysicsTable(const G4ParticleDefinition& aParticleType) {
  if (!G4HadronicProcess::GetCrossSectionDataStore()) {
    return;
  }
  G4HadronicProcess::GetCrossSectionDataStore()->BuildPhysicsTable(aParticleType);
}

G4double DummyChargeFlipProcess::GetMicroscopicCrossSection(const G4DynamicParticle* /*aParticle*/,
                                                            const G4Element* element,
                                                            G4double /*aTemp*/) {
  return 30 * millibarn * element->GetN();
}

G4bool DummyChargeFlipProcess::IsApplicable(const G4ParticleDefinition& aParticleType) {
  if (aParticleType.GetParticleType() == "rhadron")
    return true;
  else
    return false;
}

void DummyChargeFlipProcess::DumpPhysicsTable(const G4ParticleDefinition& /*aParticleType*/) {}

G4VParticleChange* DummyChargeFlipProcess::PostStepDoIt(const G4Track& aTrack, const G4Step& /*aStep*/) {
  G4ParticleChange* pc = new G4ParticleChange();
  pc->Initialize(aTrack);
  const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
  //G4ParticleDefinition* aParticleDef = aParticle->GetDefinition();

  G4double ParentEnergy = aParticle->GetTotalEnergy();
  const G4ThreeVector& ParentDirection(aParticle->GetMomentumDirection());

  G4double energyDeposit = 0.0;
  G4double finalGlobalTime = aTrack.GetGlobalTime();

  G4int numberOfSecondaries = 1;
  pc->SetNumberOfSecondaries(numberOfSecondaries);
  const G4TouchableHandle& thand = aTrack.GetTouchableHandle();

  // get current position of the track
  aTrack.GetPosition();
  // create a new track object
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  float randomParticle = G4UniformRand();
  G4ParticleDefinition* newType;
  if (randomParticle < 0.333)
    newType = particleTable->FindParticle(1009213);
  else if (randomParticle > 0.667)
    newType = particleTable->FindParticle(-1009213);
  else
    newType = particleTable->FindParticle(1009113);

  G4cout << "RHADRON: New charge = " << newType->GetPDGCharge() << G4endl;

  G4DynamicParticle* newP = new G4DynamicParticle(newType, ParentDirection, ParentEnergy);
  G4Track* secondary = new G4Track(newP, finalGlobalTime, aTrack.GetPosition());
  // switch on good for tracking flag
  secondary->SetGoodForTrackingFlag();
  secondary->SetTouchableHandle(thand);
  // add the secondary track in the List
  pc->AddSecondary(secondary);

  // Kill the parent particle
  pc->ProposeTrackStatus(fStopAndKill);
  pc->ProposeLocalEnergyDeposit(energyDeposit);
  pc->ProposeGlobalTime(finalGlobalTime);
  // Clear NumberOfInteractionLengthLeft
  ClearNumberOfInteractionLengthLeft();

  return pc;
}