G4eBremsstrahlung.cc

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// $Id: G4eBremsstrahlung.cc 98737 2016-08-09 12:51:38Z gcosmo $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4eBremsstrahlung
//
// Author:        Michel Maire
//
// Creation date: 26.06.1996
//
// Modifications:
//
// 26-09-96 extension of the total crosssection above 100 GeV, M.Maire
//  1-10-96 new type G4OrderedTable; ComputePartialSumSigma(), M.Maire
// 16-10-96 DoIt() call to the non static GetEnergyCuts(), L.Urban
// 13-12-96 Sign corrected in grejmax and greject
//          error definition of screenvar, L.Urban
// 20-03-97 new energy loss+ionisation+brems scheme, L.Urban
// 07-04-98 remove 'tracking cut' of the diffracted particle, MMa
// 13-08-98 new methods SetBining() PrintInfo()
// 03-03-99 Bug fixed in LPM effect, L.Urban
// 10-02-00 modifications , new e.m. structure, L.Urban
// 07-08-00 new cross section/en.loss parametrisation, LPM flag , L.Urban
// 21-09-00 corrections in the LPM implementation, L.Urban
// 28-05-01 V.Ivanchenko minor changes to provide ANSI -wall compilation
// 09-08-01 new methods Store/Retrieve PhysicsTable (mma)
// 17-09-01 migration of Materials to pure STL (mma)
// 21-09-01 completion of RetrievePhysicsTable() (mma)
// 29-10-01 all static functions no more inlined (mma)
// 08-11-01 particleMass becomes a local variable
// 30-04-02 V.Ivanchenko update to new design
// 23-12-02 Change interface in order to move to cut per region (VI)
// 26-12-02 Secondary production moved to derived classes (VI)
// 23-05-03 Define default integral + BohrFluctuations (V.Ivanchenko)
// 08-08-03 STD substitute standard  (V.Ivanchenko)
// 12-11-03 G4EnergyLossSTD -> G4EnergyLossProcess (V.Ivanchenko)
// 04-11-04 add gamma threshold (V.Ivanchenko)
// 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
// 22-05-06 Use gammaThreshold from manager (V.Ivantchenko)
// 15-01-07 use SetEmModel() from G4VEnergyLossProcess (mma)
//          use RelEmModel above 1GeV (AS &  VI)  
// 13-11-08 reenable LPM switch (A.Schaelicke)
// -------------------------------------------------------------------
//
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#include "G4eBremsstrahlung.hh"
#include "G4SystemOfUnits.hh"
#include "G4Gamma.hh"
#include "G4SeltzerBergerModel.hh"
#include "G4eBremsstrahlungRelModel.hh"
#include "G4UnitsTable.hh"
#include "G4LossTableManager.hh"

#include "G4ProductionCutsTable.hh"
#include "G4MaterialCutsCouple.hh"
#include "G4EmParameters.hh"

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using namespace std;
 
G4eBremsstrahlung::G4eBremsstrahlung(const G4String& name):
  G4VEnergyLossProcess(name), 
  isInitialised(false)
{
  SetProcessSubType(fBremsstrahlung);
  SetSecondaryParticle(G4Gamma::Gamma());
  SetIonisation(false);
}

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G4eBremsstrahlung::~G4eBremsstrahlung()
{}

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G4bool G4eBremsstrahlung::IsApplicable(const G4ParticleDefinition& p)
{
  return (&p == G4Electron::Electron() || &p == G4Positron::Positron());
}

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void 
G4eBremsstrahlung::InitialiseEnergyLossProcess(const G4ParticleDefinition*,
                           const G4ParticleDefinition*)
{
  if(!isInitialised) {
    G4EmParameters* param = G4EmParameters::Instance();

    G4double emin = param->MinKinEnergy();
    G4double emax = param->MaxKinEnergy();
    G4double energyLimit = std::min(emax, GeV);
    G4VEmFluctuationModel* fm = nullptr;

    if (!EmModel(1)) { SetEmModel(new G4SeltzerBergerModel(), 1); }
    EmModel(1)->SetLowEnergyLimit(emin);
    EmModel(1)->SetHighEnergyLimit(energyLimit);
    EmModel(1)->SetSecondaryThreshold(param->BremsstrahlungTh());
    EmModel(1)->SetLPMFlag(false);
    AddEmModel(1, EmModel(1), fm);

    if(emax > energyLimit) {
      if (!EmModel(2)) { SetEmModel(new G4eBremsstrahlungRelModel(), 2); }
      EmModel(2)->SetLowEnergyLimit(energyLimit);
      EmModel(2)->SetHighEnergyLimit(emax); 
      EmModel(2)->SetSecondaryThreshold(param->BremsstrahlungTh());
      EmModel(2)->SetLPMFlag(param->LPM());
      AddEmModel(2, EmModel(2), fm);
    }
    isInitialised = true;
  }
}

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void G4eBremsstrahlung::PrintInfo()
{
  if(EmModel(1)) {
    G4EmParameters* param = G4EmParameters::Instance();
    G4double eth = param->BremsstrahlungTh(); 
    G4cout << "      LPM flag: " << param->LPM() << " for E > " 
       << EmModel(1)->HighEnergyLimit()/GeV << " GeV";
    if(eth < DBL_MAX) { 
      G4cout << ",  VertexHighEnergyTh(GeV)= " << eth/GeV; 
    }
    G4cout << G4endl;
  }
}

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