Gabriele Cosmo
279 lines
9.9 KiB
C++
279 lines
9.9 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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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. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// $Id: G4MultipleScattering71.hh,v 1.4 2006/06/29 19:50:38 gunter Exp $
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// GEANT4 tag $Name: geant4-08-02 $
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//
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//
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//------------- G4MultipleScattering71 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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// 24-05-02 changes in data members, L.Urban
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// 30-10-02 changes in data members, L.Urban
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// 20-01-03 Migrade to cut per region (V.Ivanchenko)
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// 05-02-03 changes in data members, L.Urban
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// 28-03-03 Move to model design (V.Ivanchenko)
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// 18-04-03 Change name (V.Ivanchenko)
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// 16-06-03: ShortLived are not applicable any more (V.Ivanchenko)
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// 17-08-04 name of data member facxsi changed to factail together
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// with the corresponding set function (L.Urban)
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// 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
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// 15-04-05 optimize internal interfaces (V.Ivanchenko)
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// 03-10-05 Process is freezed with the name 71 (V.Ivanchenko)
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// 07-03-06 Create G4UrbanMscModel and move there step limit calculation (V.Ivanchenko)
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//
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//------------------------------------------------------------------------------
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//
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// $Id: G4MultipleScattering71.hh,v 1.4 2006/06/29 19:50:38 gunter Exp $
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// GEANT4 tag $Name: geant4-08-02 $
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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 G4MultipleScattering71_h
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#define G4MultipleScattering71_h 1
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#include "G4VMultipleScattering.hh"
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#include "G4MscModel71.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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class G4MultipleScattering71 : public G4VMultipleScattering
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{
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public: // with description
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G4MultipleScattering71(const G4String& processName="msc");
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virtual ~G4MultipleScattering71();
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// returns true for charged particles, false otherwise
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G4bool IsApplicable (const G4ParticleDefinition& p);
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virtual G4VParticleChange* AlongStepDoIt(const G4Track&, const G4Step&);
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virtual G4VParticleChange* PostStepDoIt(const G4Track&, const G4Step&);
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G4double TruePathLengthLimit(const G4Track& track,
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G4double& lambda,
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G4double currentMinimalStep);
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// Print few lines of informations about the process: validity range,
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void PrintInfo();
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// geom. step length distribution should be sampled or not
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void Setsamplez(G4bool value);
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// activate boundary algorithm
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void SetBoundary(G4bool value);
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// to reduce the energy/step dependence
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void Setdtrl(G4double value);
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void Setfactail(G4double value);
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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 SetFacrange(G4double val);
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// corrs to transport cross section for high energy
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void SetNuclCorrPar(G4double val);
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void SetFactPar(G4double val);
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protected:
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// This function initialise models
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void InitialiseProcess(const G4ParticleDefinition*);
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// This method is used for tracking, it returns step limit
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virtual G4double GetContinuousStepLimit(const G4Track& track,
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G4double previousStepSize,
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G4double currentMinimalStep,
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G4double& currentSafety);
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private:
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// hide assignment operator as private
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G4MultipleScattering71 & operator = (const G4MultipleScattering71 &right);
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G4MultipleScattering71 ( const G4MultipleScattering71 &);
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private: // data members
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G4MscModel71* model;
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G4double lowKineticEnergy;
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G4double highKineticEnergy;
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G4int totBins;
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G4double truePathLength;
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G4double geomPathLength;
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G4double trueStepLength;
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G4double range;
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G4double facrange;
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G4double tlimit;
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G4double tlimitmin;
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G4double dtrl;
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G4double NuclCorrPar;
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G4double FactPar;
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G4double factail;
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G4double cf;
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G4int stepnolastmsc;
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G4int nsmallstep;
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G4bool samplez;
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G4bool boundary;
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G4bool isInitialized;
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};
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//--------------------------------------------------------------------
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// inline methods
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//--------------------------------------------------------------------
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inline G4bool G4MultipleScattering71::IsApplicable (const G4ParticleDefinition& p)
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{
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return (p.GetPDGCharge() != 0.0 && !p.IsShortLived());
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4MultipleScattering71::GetContinuousStepLimit(
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const G4Track& track,
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G4double,
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G4double currentMinimalStep,
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G4double&)
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{
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DefineMaterial(track.GetMaterialCutsCouple());
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const G4MaterialCutsCouple* couple = CurrentMaterialCutsCouple();
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G4double e = track.GetKineticEnergy();
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model = dynamic_cast<G4MscModel71*>(SelectModel(e));
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const G4ParticleDefinition* p = track.GetDefinition();
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G4double lambda0 = GetLambda(p, e);
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range = G4LossTableManager::Instance()->GetRangeFromRestricteDEDX(p,e,couple);
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if(range < currentMinimalStep) currentMinimalStep = range;
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truePathLength = TruePathLengthLimit(track,lambda0,currentMinimalStep);
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// G4cout << "StepLimit: tpl= " << truePathLength << " lambda0= "
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// << lambda0 << " range= " << currentRange
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// << " currentMinStep= " << currentMinimalStep << G4endl;
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if (truePathLength < currentMinimalStep) valueGPILSelectionMSC = CandidateForSelection;
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geomPathLength = model->GeomPathLength(LambdaTable(),couple,
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p,e,lambda0,range,truePathLength);
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if(geomPathLength > lambda0) geomPathLength = lambda0;
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return geomPathLength;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4VParticleChange* G4MultipleScattering71::AlongStepDoIt(
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const G4Track&,
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const G4Step& step)
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{
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G4double geomStepLength = step.GetStepLength();
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if((geomStepLength == geomPathLength) && (truePathLength <= range))
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trueStepLength = truePathLength;
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else
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trueStepLength = model->TrueStepLength(geomStepLength);
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fParticleChange.ProposeTrueStepLength(trueStepLength);
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return &fParticleChange;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4VParticleChange* G4MultipleScattering71::PostStepDoIt(const G4Track& track,
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const G4Step& step)
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{
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fParticleChange.Initialize(track);
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model->SampleSecondaries(CurrentMaterialCutsCouple(),track.GetDynamicParticle(),
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step.GetStepLength(),step.GetPostStepPoint()->GetSafety());
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return &fParticleChange;
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}
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// geom. step length distribution should be sampled or not
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inline void G4MultipleScattering71::Setsamplez(G4bool value)
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{
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samplez = value;
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}
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// activate boundary algorithm
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inline void G4MultipleScattering71::SetBoundary(G4bool value)
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{
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boundary = value;
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}
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// to reduce the energy/step dependence
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inline void G4MultipleScattering71::Setdtrl(G4double value)
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{
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dtrl = value;
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}
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inline void G4MultipleScattering71::Setfactail(G4double value)
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{
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factail = value;
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}
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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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inline void G4MultipleScattering71::SetFacrange(G4double val)
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{
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facrange = val;
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nsmallstep = G4int(std::log((cf+facrange-1.)/facrange)/std::log(cf))+1;
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}
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// corrs to transport cross section for high energy
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inline void G4MultipleScattering71::SetNuclCorrPar(G4double val)
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{
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NuclCorrPar = val;
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}
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inline void G4MultipleScattering71::SetFactPar(G4double val)
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{
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FactPar = val;
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}
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#endif
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