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None Secondary generated electrons magnetic deviation 

Forum: Physics List
Date: 21 Mar, 2007
From: alex <caraboy@gmail.com>

Hello,

I am trying to simulate the passage of protons throught a magnetic dipole, and I activated the following physics processes:

---------------------------------------

// ExN01PhysicsList.cc

// generated by Geant4 Physics Editor at Thu Mar 01 23:17:47 EET 2007

#include "ExN01PhysicsList.hh"

#include "globals.hh"
#include "G4ParticleDefinition.hh"
#include "G4ParticleWithCuts.hh"
#include "G4ProcessManager.hh"
#include "G4ProcessVector.hh"
#include "G4ParticleTypes.hh"
#include "G4ParticleTable.hh"
#include "G4ShortLivedConstructor.hh"
#include "G4Material.hh"
#include "G4MaterialTable.hh"

#include "G4ios.hh"

ExN01PhysicsList::ExN01PhysicsList(): G4VUserPhysicsList() { // Here used the default cut value you have typed in

  defaultCutValue = 1.0*cm;
  SetVerboseLevel(1);
}

ExN01PhysicsList::~ExN01PhysicsList() {}

void ExN01PhysicsList::ConstructParticle() { // Here are constructed all particles you have chosen

  ConstructBosons();
  ConstructLeptons();
  ConstructMesons();
  ConstructBaryons();
  ConstructAllShortLiveds();
}

// In this method, static member functions should be called for ALL particles to be used.

void ExN01PhysicsList::ConstructBosons()
{
  //pseudo particles
  G4Geantino::GeantinoDefinition();
  G4ChargedGeantino::ChargedGeantinoDefinition();

  // gamma
  G4Gamma::GammaDefinition();
}
void ExN01PhysicsList::ConstructLeptons()
{

  // leptons
  //  e+/-
  G4Electron::ElectronDefinition();
  G4Positron::PositronDefinition();
  // mu+/-
  G4MuonPlus::MuonPlusDefinition();
  G4MuonMinus::MuonMinusDefinition();
  // nu_e
  G4NeutrinoE::NeutrinoEDefinition();
  G4AntiNeutrinoE::AntiNeutrinoEDefinition();
  // nu_mu
  G4NeutrinoMu::NeutrinoMuDefinition();
  G4AntiNeutrinoMu::AntiNeutrinoMuDefinition(); 

} void ExN01PhysicsList::ConstructMesons() {

 //  mesons
  //    light mesons
  G4PionPlus::PionPlusDefinition();
  G4PionMinus::PionMinusDefinition();
  G4PionZero::PionZeroDefinition();
  G4Eta::EtaDefinition();
  G4EtaPrime::EtaPrimeDefinition();
  G4KaonPlus::KaonPlusDefinition();
  G4KaonMinus::KaonMinusDefinition();
  G4KaonZero::KaonZeroDefinition();
  G4AntiKaonZero::AntiKaonZeroDefinition();
  G4KaonZeroLong::KaonZeroLongDefinition();
  G4KaonZeroShort::KaonZeroShortDefinition();

}
void ExN01PhysicsList::ConstructBaryons()
{
  //  barions
  G4Proton::ProtonDefinition();
  G4AntiProton::AntiProtonDefinition();

  G4Neutron::NeutronDefinition();
  G4AntiNeutron::AntiNeutronDefinition();
}
void ExN01PhysicsList::ConstructAllShortLiveds()
{
// Here are contructed all short liveds

} void ExN01PhysicsList::ConstructProcess() { // Transportation, electromagnetic and general processes

  AddTransportation();
  ConstructEM();
  ConstructGeneral();
}

#include "G4SynchrotronRadiation.hh"

#include "G4hIonisation.hh"
#include "G4MultipleScattering.hh"

#include "G4ComptonScattering.hh"
#include "G4GammaConversion.hh"
#include "G4PhotoElectricEffect.hh"

#include "G4MultipleScattering.hh"

#include "G4eIonisation.hh"
#include "G4eBremsstrahlung.hh"
#include "G4eplusAnnihilation.hh"

#include "G4MuIonisation.hh"
#include "G4MuBremsstrahlung.hh"
#include "G4MuPairProduction.hh"

#include "G4hIonisation.hh"

#include "G4StepLimiter.hh"
#include "G4UserSpecialCuts.hh"

void ExN01PhysicsList::ConstructEM()
{
  theParticleIterator->reset();
  while( (*theParticleIterator)() ){
    G4ParticleDefinition* particle = theParticleIterator->value();
    G4ProcessManager* pmanager = particle->GetProcessManager();
    G4String particleName = particle->GetParticleName();

    if (particleName == "gamma") {
      // gamma         
      pmanager->AddDiscreteProcess(new G4PhotoElectricEffect);
      pmanager->AddDiscreteProcess(new G4ComptonScattering);
      pmanager->AddDiscreteProcess(new G4GammaConversion);

    } else if (particleName == "e-") {
      //electron
      pmanager->AddProcess(new G4MultipleScattering,-1, 1,1);
      pmanager->AddProcess(new G4eIonisation,       -1, 2,2);
      pmanager->AddProcess(new G4eBremsstrahlung,   -1, 3,3);      

    } else if (particleName == "e+") {
      //positron
      pmanager->AddProcess(new G4MultipleScattering,-1, 1,1);
      pmanager->AddProcess(new G4eIonisation,       -1, 2,2);
      pmanager->AddProcess(new G4eBremsstrahlung,   -1, 3,3);
      pmanager->AddProcess(new G4eplusAnnihilation,  0,-1,4);

    } else if( particleName == "mu+" || 
               particleName == "mu-"    ) {
      //muon  
      pmanager->AddProcess(new G4MultipleScattering,-1, 1,1);
      pmanager->AddProcess(new G4MuIonisation,      -1, 2,2);
      pmanager->AddProcess(new G4MuBremsstrahlung,  -1, 3,3);
      pmanager->AddProcess(new G4MuPairProduction,  -1, 4,4);       

    } else if ((!particle->IsShortLived()) &&
	       (particle->GetPDGCharge() != 0.0) && 
	       (particle->GetParticleName() != "chargedgeantino")) {
      //all others charged particles except geantino
      pmanager->AddProcess(new G4MultipleScattering,-1, 1,1);
      pmanager->AddProcess(new G4hIonisation,       -1, 2,2);
      //step limit
      pmanager->AddProcess(new G4StepLimiter,       -1,-1,3);         
      ///pmanager->AddProcess(new G4UserSpecialCuts,   -1,-1,4);  
    }
  }
}

#include "G4Decay.hh"

void ExN01PhysicsList::ConstructGeneral()
{
   // Add Decay Process
  G4Decay* theDecayProcess = new G4Decay();
  theParticleIterator->reset();
  while( (*theParticleIterator)() ){
    G4ParticleDefinition* particle = theParticleIterator->value();
    G4ProcessManager* pmanager = particle->GetProcessManager();
    if (theDecayProcess->IsApplicable(*particle)) { 
      pmanager ->AddProcess(theDecayProcess);
      // set ordering for PostStepDoIt and AtRestDoIt
      pmanager ->SetProcessOrdering(theDecayProcess, idxPostStep);
      pmanager ->SetProcessOrdering(theDecayProcess, idxAtRest);
    }
  }
}

void ExN01PhysicsList::SetCuts() { // defaultCutValue you have typed in is used

  if (verboseLevel >1){
    G4cout << "ExN01PhysicsList::SetCuts:";
  }
  SetCutsWithDefault();
}
--------------------------------------------------

I obtained the following results: http://img233.imageshack.us/img233/2623/wiredoutputcr1.jpg

http://img144.imageshack.us/img144/5893/wiredoutput1uk1.jpg

The question is: why the secondary electrons (the red trajectories) observed into the magnetic field (into the box) are not deviated by it. Shouldn`t they create a spiral trajectory? I have to activate aditional interaction between the secondary e- and the magnetic field?

The incident protons have 1 GeV energy.

Thank you.

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1 None: Re: Secondary generated electrons magnetic deviation   (Vladimir IVANTCHENKO - 21 Mar, 2007)
(_ None: Re: Secondary generated electrons magnetic deviation   (alex - 23 Mar, 2007)
(_ None: Re: Secondary generated electrons magnetic deviation   (Vladimir IVANTCHENKO - 26 Mar, 2007)
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