G4ComptonScattering.cc

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// $Id: G4ComptonScattering.cc 107058 2017-11-01 14:54:12Z gcosmo $
//
// 
//------------ G4ComptonScattering physics process -----------------------------
//                   by Michel Maire, April 1996
//
// 28-05-96, DoIt() small change in ElecDirection, by M.Maire
// 10-06-96, simplification in ComputeMicroscopicCrossSection(), by M.Maire
// 21-06-96, SetCuts implementation, M.Maire
// 13-09-96, small changes in DoIt for better efficiency. Thanks to P.Urban
// 06-01-97, crossection table + meanfreepath table, M.Maire
// 05-03-97, new Physics scheme, M.Maire
// 28-03-97, protection in BuildPhysicsTable, M.Maire
// 07-04-98, remove 'tracking cut' of the scattered gamma, MMa
// 04-06-98, in DoIt, secondary production condition:
//                                     range>std::min(threshold,safety)
// 13-08-98, new methods SetBining()  PrintInfo()
// 15-12-98, cross section=0 below 10 keV
// 28-05-01, V.Ivanchenko minor changes to provide ANSI -wall compilation
// 13-07-01, DoIt: suppression of production cut for the electron (mma)
// 03-08-01, new methods Store/Retrieve PhysicsTable (mma)
// 06-08-01, BuildThePhysicsTable() called from constructor (mma)
// 17-09-01, migration of Materials to pure STL (mma)
// 20-09-01, DoIt: fminimalEnergy = 1*eV (mma)
// 01-10-01, come back to BuildPhysicsTable(const G4ParticleDefinition&)
// 17-04-02, LowestEnergyLimit = 1*keV     
// 26-05-04, cross section parametrization improved for low energy :
//           Egamma <~ 15 keV (Laszlo) 
// 08-11-04, Remove Store/Retrieve tables (V.Ivanchenko)
// 09-03-05  Migrate to model interface 
//           and inherit from G4VEmProcess (V.Ivanchenko) 
// 04-05-05, Make class to be default (V.Ivanchenko)
// 09-09-06, modify SetModel(G4VEmModel*) (mma)
// 12-09-06, move SetModel(G4VEmModel*) in G4VEmProcess (mma)
//
// -----------------------------------------------------------------------------

#include "G4ComptonScattering.hh"
#include "G4SystemOfUnits.hh"
#include "G4KleinNishinaModel.hh"
#include "G4KleinNishinaCompton.hh"
#include "G4Electron.hh"
#include "G4EmParameters.hh"

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using namespace std;

G4ComptonScattering::G4ComptonScattering(const G4String& processName,
  G4ProcessType type):G4VEmProcess (processName, type),
    isInitialised(false)
{
  SetStartFromNullFlag(true);
  SetBuildTableFlag(true);
  SetSecondaryParticle(G4Electron::Electron());
  SetProcessSubType(fComptonScattering);
  SetMinKinEnergyPrim(1*MeV);
  SetSplineFlag(true);
}

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G4ComptonScattering::~G4ComptonScattering()
{}

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G4bool G4ComptonScattering::IsApplicable(const G4ParticleDefinition& p)
{
  return (&p == G4Gamma::Gamma());
}

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void G4ComptonScattering::InitialiseProcess(const G4ParticleDefinition*)
{
  if(!isInitialised) {
    isInitialised = true;
    if(!EmModel(0)) { SetEmModel(new G4KleinNishinaCompton()); }
    G4EmParameters* param = G4EmParameters::Instance();
    EmModel(0)->SetLowEnergyLimit(param->MinKinEnergy());
    EmModel(0)->SetHighEnergyLimit(param->MaxKinEnergy());
    AddEmModel(1, EmModel(0));
  } 
}

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void G4ComptonScattering::PrintInfo()
{}         

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void G4ComptonScattering::ProcessDescription(std::ostream& out) const
{
  out << "<strong>Compton scattering</strong>";
  G4VEmProcess::ProcessDescription(out);
}

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