Added Landau energy loss distribution at carbon foil of LEM apparatus
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Thomas Prokscha
parent
0e40759af3
commit
ba04c8dc77
@ -41,6 +41,7 @@ class G4VPhysicalVolume;
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class G4Material;
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class musrDetectorMessenger;
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class musrScintSD;
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class musrMuEnergyLossLandau;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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95
include/musrMuEnergyLossLandau.hh
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95
include/musrMuEnergyLossLandau.hh
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@ -0,0 +1,95 @@
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/***************************************************************************
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* musrSim - the program for the simulation of (mainly) muSR instruments. *
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* More info on http://lmu.web.psi.ch/simulation/index.html . *
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* musrSim is based od Geant4 (http://geant4.web.cern.ch/geant4/) *
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* *
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* Copyright (C) 2009 by Paul Scherrer Institut, 5232 Villigen PSI, *
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* Switzerland *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software *
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
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***************************************************************************/
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//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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// Muonium Formation according to yield.cc function (through GetYields method).
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// Id : musrMuFormation.hh, v 1.4
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// Author: Taofiq PARAISO, T. Shiroka
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// Date : 2007-12
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//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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#ifndef musrMuEnergyLossLandau_h
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#define musrMuEnergyLossLandau_h 1
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#include "G4VDiscreteProcess.hh"
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#include "G4ParticleTable.hh"
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#include <TMath.h>
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#include <TRandom.h>
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/*! musrMuEnergyLossLandau class defines the energy loss given by the Landau distribution,
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in, for example, the thin Carbon foil of the LEM beam line
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*/
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class musrMuEnergyLossLandau : public G4VDiscreteProcess
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{
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public:
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musrMuEnergyLossLandau(const G4String& name = "MuEnergyLossLandau", // process description
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G4ProcessType aType = fElectromagnetic);
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~musrMuEnergyLossLandau();
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//! - Main method. muon energy loss process is executed at the END of a step. */
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G4VParticleChange* PostStepDoIt(
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const G4Track&,
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const G4Step&);
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G4double GetMeanFreePath(const G4Track& aTrack,
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G4double previousStepSize,
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G4ForceCondition* condition);
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//! Condition for process application (step Object).
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G4bool CheckCondition(const G4Step& aStep);
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//! Condition for process application (step Pointer).
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G4bool CheckCondition(const G4Step* aStep);
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G4String p_name;
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G4bool condition;
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void GetFinalEnergy( const G4Step* aStep);
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TRandom *random;
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static double landauMPV;
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static double landauSigma;
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// model parameters
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G4ParticleTable* particleTable;
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G4ParticleDefinition* particle;
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G4double rnd;
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G4DynamicParticle *DP;
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//! The particle change object.
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G4VParticleChange fParticleChange;
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void PrepareSecondary(const G4Track&);
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G4Track* aSecondary;
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void InitializeSecondaries(const G4Track&);
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};
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#endif
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@ -29,6 +29,7 @@
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#include "musrScintSD.hh"
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#include "musrEventAction.hh"
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#include "musrMuEnergyLossLandau.hh"
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#include "G4GeometryManager.hh"
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#include "G4PhysicalVolumeStore.hh"
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@ -74,6 +75,8 @@
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#include "musrErrorMessage.hh"
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#include "musrSteppingAction.hh"
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using namespace std;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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musrDetectorConstruction::musrDetectorConstruction(G4String steeringFileName)
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@ -1538,6 +1541,14 @@ G4VPhysicalVolume* musrDetectorConstruction::Construct() {
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; // processes are interpreded later in musrPhysicsList.cc
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}
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else if (strcmp(tmpString1,"SetLandauMPV")==0){
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sscanf(&line[0],"%*s %*s %lf",&musrMuEnergyLossLandau::landauMPV);
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cout << "landauMPV = " << musrMuEnergyLossLandau::landauMPV << endl;
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}
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else if (strcmp(tmpString1,"SetLandauSigma")==0){
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sscanf(&line[0],"%*s %*s %lf",&musrMuEnergyLossLandau::landauSigma);
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cout << "landauSigma = " << musrMuEnergyLossLandau::landauSigma << endl;
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}
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else ReportGeometryProblem(line);
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132
src/musrMuEnergyLossLandau.cc
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132
src/musrMuEnergyLossLandau.cc
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@ -0,0 +1,132 @@
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/***************************************************************************
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* musrSim - the program for the simulation of (mainly) muSR instruments. *
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* More info on http://lmu.web.psi.ch/simulation/index.html . *
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* musrSim is based od Geant4 (http://geant4.web.cern.ch/geant4/) *
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* *
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* Copyright (C) 2009 by Paul Scherrer Institut, 5232 Villigen PSI, *
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* Switzerland *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software *
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
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***************************************************************************/
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//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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// Muonium Formation according to yield.cc function (through GetYields method).
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// Id : musrMuFormation.cc, v 1.4
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// Author: Taofiq PARAISO, T. Shiroka
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// Date : 2007-12
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//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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#include "musrMuEnergyLossLandau.hh"
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using namespace std;
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musrMuEnergyLossLandau::musrMuEnergyLossLandau(const G4String& name, G4ProcessType aType)
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: G4VDiscreteProcess(name, aType)
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{
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random = new TRandom();
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}
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musrMuEnergyLossLandau::~musrMuEnergyLossLandau(){}
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double musrMuEnergyLossLandau::landauMPV = 0.1;
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double musrMuEnergyLossLandau::landauSigma = 0.1;
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G4VParticleChange* musrMuEnergyLossLandau::PostStepDoIt(const G4Track& trackData,
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const G4Step& aStep)
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{ // Initialize ParticleChange (by setting all its members equal to
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// the corresponding members in G4Track)
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fParticleChange.Initialize(trackData);
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G4Track theNewTrack;
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if(CheckCondition(aStep))
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{
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GetFinalEnergy(&aStep);
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G4Step theStep;
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PrepareSecondary( trackData);
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fParticleChange.AddSecondary(aSecondary);
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fParticleChange.ProposeTrackStatus(fStopAndKill) ;
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}
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else
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{
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fParticleChange.ProposeTrackStatus(trackData.GetTrackStatus()) ;
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}
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return &fParticleChange;
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}
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G4bool musrMuEnergyLossLandau::CheckCondition(const G4Step& aStep)
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{ // Decide when to call the MuEnergyLossLandau - i.e. for muons going through the C foil.
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condition=false;
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p_name = aStep.GetTrack()->GetDefinition()->GetParticleName(); // particle name
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std::string logVolName = aStep.GetTrack()->GetVolume()->GetLogicalVolume()->GetName();
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if(p_name == "mu+" && ((logVolName=="log_coulombCFoil")||(logVolName=="log_CFoil")))
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{
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condition=true;
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}
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return condition;
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}
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G4double musrMuEnergyLossLandau::GetMeanFreePath(const G4Track&,
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G4double,
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G4ForceCondition* condition1)
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{
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*condition1 = Forced;
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return DBL_MAX;
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}
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void musrMuEnergyLossLandau::GetFinalEnergy(const G4Step* aStep)
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{ // Particle generation
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particleTable=G4ParticleTable::GetParticleTable();
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G4double Eloss, Efinal;
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G4double E = aStep->GetTrack()->GetDynamicParticle()->GetKineticEnergy()/CLHEP::keV;
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// Positive muon
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if(p_name=="mu+"){
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do{
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Eloss = random->Landau(landauMPV,landauSigma);
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} while (Eloss < 0.);
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Efinal = E - Eloss;
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// cout << "E, Eloss, Efinal = " << E << ", " << Eloss << ", " << Efinal << endl;
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particle = particleTable->FindParticle(p_name) ;
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// Set the new dynamic particle DP
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DP = new G4DynamicParticle(particle,
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aStep->GetTrack()->GetDynamicParticle()->GetMomentumDirection(),
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Efinal/1000.);
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/* IMPORTANT : COPY THOSE DATA TO GET THE SAME PARTICLE PROPERTIES!!!
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SHOULD BE KEPT WHEN BUILDING A PARTICLE CHANGE */
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DP->SetProperTime( aStep->GetTrack()->GetDynamicParticle()->GetProperTime());
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DP->SetPolarization(aStep->GetTrack()->GetDynamicParticle()->GetPolarization().x(),
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aStep->GetTrack()->GetDynamicParticle()->GetPolarization().y(),
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aStep->GetTrack()->GetDynamicParticle()->GetPolarization().z());
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DP->SetPreAssignedDecayProperTime(
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aStep->GetTrack()->GetDynamicParticle()->GetPreAssignedDecayProperTime());
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}
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}
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void musrMuEnergyLossLandau::PrepareSecondary(const G4Track& track)
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{
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if(p_name=="mu+")
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{
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aSecondary = new G4Track(DP,track.GetGlobalTime(),track.GetPosition());
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}
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}
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@ -263,6 +263,9 @@ void musrPhysicsList::ConstructProcess()
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// For Muonium formation in the Carbon foil
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#include "musrMuFormation.hh" // includes the yield function Y = Y(E).
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// For muon energy loss in thin Carbon foil
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#include "musrMuEnergyLossLandau.hh"
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// For a simple Muonium "scattering" when Mu hits solid materials
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#include "musrMuScatter.hh"
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@ -381,6 +384,7 @@ void musrPhysicsList::ConstructEM()
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// else if (stringProcessName=="G4hIonisation") pManager->AddProcess(new G4hIonisation,nr1,nr2,nr3);
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// else if (stringProcessName=="G4hLowEnergyIonisation") pManager->AddProcess(new G4hLowEnergyIonisation,nr1,nr2,nr3);
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else if (stringProcessName=="musrMuFormation") pManager->AddProcess(new musrMuFormation,nr1,nr2,nr3);
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else if (stringProcessName=="musrMuEnergyLossLandau") pManager->AddProcess(new musrMuEnergyLossLandau,nr1,nr2,nr3);
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else if (stringProcessName=="G4Scintillation") {
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G4Scintillation* myScintillation = new G4Scintillation();
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// if (musrParameters::finiteRiseTimeInScintillator) myScintillation->SetFiniteRiseTime(true);
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