228 lines
9.5 KiB
C++
228 lines
9.5 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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// $Id$
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// GEANT4 tag $Name: geant4-07-00-cand-03 $
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//
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//------------- G4MultipleScattering52 physics process --------------------------
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// by Laszlo Urban, March 2001
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//
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// 07-08-01 new methods Store/Retrieve PhysicsTable
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// 23-08-01 new angle and z distribution,energy dependence reduced,
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// Store,Retrieve methods commented out temporarily, L.Urban
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// 11-09-01 G4MultipleScatteringx put as default: G4MultipleScattering
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// Store,Retrieve methods reactived (mma)
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// 13-09-01 Unused TrueToGeomTransformation method deleted,
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// class description (L.Urban)
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// 19-09-01 come back to previous process name msc
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// 17-04-02 NEW angle distribution + boundary algorithm modified, L.Urban
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// 22-04-02 boundary algorithm modified -> important improvement in timing !!!!
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// (L.Urban)
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// 24-04-02 some minor changes in boundary algorithm, L.Urban
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// 24-05-02 changes in data members, L.Urban
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// 30-10-02 changes in data members, L.Urban
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// 05-02-03 changes in data members, L.Urban
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// 18-04-03 Change signature of GetTransportMeanFreePath (V.Ivanchenko)
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// 08-08-03 This class is frozen at the release 5.2 (V.Ivanchenko)
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// 08-11-04 Remove Store/Retrieve tables (V.Ivantchenko)
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//------------------------------------------------------------------------------
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// class description
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//
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/** The class simulates the multiple scattering for any kind
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* of charged particle.
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*/
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// class description - end
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#ifndef LEMuSRMSC_h
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#define LEMuSRMSC_h 1
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#include "G4VContinuousDiscreteProcess.hh"
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#include "G4EnergyLossTables.hh"
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#include "G4GPILSelection.hh"
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#include "G4PhysicsLogVector.hh"
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#include "G4VPhysicalVolume.hh"
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#include "LEMuSRParticleChangeForMSC.hh"
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#include "G4UnitsTable.hh"
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#include "G4MaterialCutsCouple.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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class LEMuSRMSC : public G4VContinuousDiscreteProcess
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{
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public: // with description
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LEMuSRMSC(const G4String& processName="lemumsc");
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~LEMuSRMSC();
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G4bool IsApplicable ( const G4ParticleDefinition& );
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// returns true for charged particles, false otherwise
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void BuildPhysicsTable(const G4ParticleDefinition& aParticleType);
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// This function overloads the corresponding virtual function
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// of the base class G4VContinuousDiscreteProcess.
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// It is invoked by the G4ParticleWithCuts()::SetCut() method.
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// It prepares the table of the transport mean free paths
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// for every material.
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void PrintInfoDefinition();
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// Print few lines of informations about the process: validity range,
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// origine ..etc..
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// Invoked by BuildPhysicsTable().
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G4double AlongStepGetPhysicalInteractionLength(const G4Track&,
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G4double previousStepSize,
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G4double currentMinimumStep,
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G4double& currentSafety,
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G4GPILSelection* selection);
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// The function overloads the corresponding function of the base
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// class.It limits the step near to boundaries only
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// and invokes the method GetContinuousStepLimit at every step.
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G4double GetContinuousStepLimit(const G4Track& aTrack,
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G4double previousStepSize,
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G4double currentMinimumStep,
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G4double& currentSafety);
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// It performs the true step length --> geometrical step length
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// transformation. It is invoked by the
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// AlongStepGetPhysicalInteractionLength method.
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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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// It sets the force condition to true only
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// in order to have the PostStepDoIt called at every step.
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// This function overloads a virtual function of the base class.
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// It is invoked by the ProcessManager of the Particle.
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G4double GetTransportMeanFreePath(
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G4double KineticEnergy,const G4MaterialCutsCouple* couple);
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// Just a utility method to get the values of the transport
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// mean free path . (It is not used inside the class.)
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G4VParticleChange* AlongStepDoIt(const G4Track& aTrack,const G4Step& aStep);
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// The geometrical step length --> true path length transformation
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// is performed here (the inverse of the transformation done
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// by GetContinuousStepLimit).
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G4VParticleChange* PostStepDoIt(const G4Track& aTrack,const G4Step& aStep);
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// It computes the final state of the particle: samples the
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// scattering angle and computes the lateral displacement.
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// The final state is returned as a ParticleChange object.
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// This function overloads a virtual function of the base class.
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// It is invoked by the ProcessManager of the Particle.
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void Setsamplez(G4bool value) {samplez = value;};
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// geom. step length distribution should be sampled or not
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void Setdtrl(G4double value) {dtrl = value;};
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// to reduce the energy/step dependence
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void SetBoundary(G4bool value) {boundary = value;};
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void Setfacxsi(G4double value) {facxsi = value;
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G4cout << " facxsi=" << facxsi << G4endl;};
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void SetFacrange(G4double val) {facrange=val;
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nsmallstep = G4int(std::log((cf+facrange-1.)/
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facrange)/std::log(cf))+1 ;
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G4cout << " fr=" << facrange
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<< " nsmall=" << nsmallstep << G4endl ;};
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// Steplimit after boundary crossing = facrange*range
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// estimated nb of steps at boundary nsmallstep = 1/facrange
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void SetLateralDisplacementFlag(G4bool flag) {fLatDisplFlag = flag;};
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// lateral displacement to be/not to be computed
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void SetNuclCorrPar(G4double val) {NuclCorrPar = val;};
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void SetFactPar(G4double val) {FactPar = val;};
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protected: // with description
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virtual G4double ComputeTransportCrossSection(
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const G4ParticleDefinition& aParticleType,
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G4double KineticEnergy,
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G4double AtomicNumber,
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G4double AtomicWeight);
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// It computes the transport cross section.
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// The transport mean free path is 1/(transport cross section).
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private:
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// hide assignment operator as private
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LEMuSRMSC & operator = (const LEMuSRMSC &right);
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LEMuSRMSC ( const LEMuSRMSC &);
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private: // data members
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G4PhysicsTable* theTransportMeanFreePathTable;
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G4double taubig,tausmall,taulim;
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G4double LowestKineticEnergy;
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G4double HighestKineticEnergy;
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G4int TotBin;
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G4int materialIndex;
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G4double tLast;
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G4double zLast;
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// model parameters
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G4bool boundary; // spec. handling near boundaries
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G4double facrange,tlimit,tlimitmin,cf;
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G4int stepno,stepnolastmsc,nsmallstep ;
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G4double laststep ;
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G4GPILSelection valueGPILSelectionMSC;
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G4double zmean; // z(geom.step length)
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G4bool samplez ; // distribution
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G4double range,T0,T1,lambda0,lambda1, // used to reduce the energy
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Tlow,alam,blam,dtrl,lambdam, // (or step length) dependence
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clam,zm,cthm;
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// with/without lateral displacement
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G4bool fLatDisplFlag;
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// nuclear size effect correction
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G4double NuclCorrPar;
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G4double FactPar;
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LEMuSRParticleChangeForMSC fParticleChange;
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G4double alfa1,alfa2,alfa3,b,xsi,c0,facxsi ; // angle distr. parameters
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// facxsi : some tuning
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// possibility in the tail
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};
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#include "LEMuSRMSC.icc"
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#endif
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