Gabriele Cosmo
310 lines
8.7 KiB
C++
310 lines
8.7 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: G4WentzelVIModel.hh,v 1.7 2008/08/04 08:49:09 vnivanch Exp $
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// GEANT4 tag $Name: geant4-09-02 $
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//
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// -------------------------------------------------------------------
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//
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//
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// GEANT4 Class header file
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//
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//
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// File name: G4WentzelVIModel
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//
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// Author: V.Ivanchenko
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//
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// Creation date: 09.04.2008 from G4MuMscModel
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//
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// Modifications:
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//
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//
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// Class Description:
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//
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// Implementation of the model of multiple scattering based on
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// G.Wentzel, Z. Phys. 40 (1927) 590.
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// H.W.Lewis, Phys Rev 78 (1950) 526.
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// J.M. Fernandez-Varea et al., NIM B73 (1993) 447.
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// L.Urban, CERN-OPEN-2006-077.
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// -------------------------------------------------------------------
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//
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#ifndef G4WentzelVIModel_h
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#define G4WentzelVIModel_h 1
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#include "G4VMscModel.hh"
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#include "G4PhysicsTable.hh"
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#include "G4MscStepLimitType.hh"
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#include "G4MaterialCutsCouple.hh"
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#include "G4NistManager.hh"
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class G4LossTableManager;
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class G4ParticleChangeForMSC;
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class G4SafetyHelper;
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class G4ParticleDefinition;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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class G4WentzelVIModel : public G4VMscModel
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{
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public:
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G4WentzelVIModel(const G4String& nam = "WentzelVIUni");
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virtual ~G4WentzelVIModel();
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void Initialise(const G4ParticleDefinition*, const G4DataVector&);
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G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
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G4double KineticEnergy,
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G4double AtomicNumber,
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G4double AtomicWeight=0.,
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G4double cut = DBL_MAX,
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G4double emax= DBL_MAX);
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void SampleScattering(const G4DynamicParticle*, G4double safety);
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void SampleSecondaries(std::vector<G4DynamicParticle*>*,
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const G4MaterialCutsCouple*,
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const G4DynamicParticle*,
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G4double,
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G4double);
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G4double ComputeTruePathLengthLimit(const G4Track& track,
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G4PhysicsTable* theLambdaTable,
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G4double currentMinimalStep);
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G4double ComputeGeomPathLength(G4double truePathLength);
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G4double ComputeTrueStepLength(G4double geomStepLength);
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private:
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G4double ComputeTransportXSectionPerVolume();
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G4double ComputeXSectionPerVolume();
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void ComputeMaxElectronScattering(G4double cut);
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inline G4double GetLambda(G4double kinEnergy);
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inline void SetupParticle(const G4ParticleDefinition*);
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inline void SetupKinematic(G4double kinEnergy, G4double cut);
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inline void SetupTarget(G4double Z, G4double kinEnergy);
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inline void DefineMaterial(const G4MaterialCutsCouple*);
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// hide assignment operator
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G4WentzelVIModel & operator=(const G4WentzelVIModel &right);
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G4WentzelVIModel(const G4WentzelVIModel&);
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const G4ParticleDefinition* theProton;
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const G4ParticleDefinition* theElectron;
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const G4ParticleDefinition* thePositron;
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G4ParticleChangeForMSC* fParticleChange;
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G4SafetyHelper* safetyHelper;
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G4PhysicsTable* theLambdaTable;
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G4PhysicsTable* theLambda2Table;
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G4LossTableManager* theManager;
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const G4DataVector* currentCuts;
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G4NistManager* fNistManager;
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G4double numlimit;
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G4double tlimitminfix;
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G4double invsqrt12;
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// cash
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G4double preKinEnergy;
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G4double ecut;
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G4double lambda0;
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G4double tPathLength;
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G4double zPathLength;
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G4double lambdaeff;
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G4double currentRange;
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G4double par1;
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G4double par2;
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G4double par3;
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G4double xtsec;
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std::vector<G4double> xsecn;
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std::vector<G4double> prob;
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G4int nelments;
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G4int nbins;
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G4int nwarnings;
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G4int nwarnlimit;
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G4int currentMaterialIndex;
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const G4MaterialCutsCouple* currentCouple;
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const G4Material* currentMaterial;
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// single scattering parameters
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G4double coeff;
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G4double constn;
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G4double cosThetaMin;
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G4double cosThetaMax;
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G4double cosTetMaxNuc;
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G4double cosTetMaxNuc2;
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G4double cosTetMaxElec;
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G4double cosTetMaxElec2;
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G4double q2Limit;
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G4double alpha2;
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G4double a0;
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// projectile
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const G4ParticleDefinition* particle;
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G4double chargeSquare;
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G4double spin;
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G4double mass;
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G4double tkin;
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G4double mom2;
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G4double invbeta2;
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G4double etag;
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G4double lowEnergyLimit;
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// target
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G4double targetZ;
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G4double screenZ;
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G4double formfactA;
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G4double FF[100];
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// flags
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G4bool isInitialized;
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G4bool inside;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline
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void G4WentzelVIModel::DefineMaterial(const G4MaterialCutsCouple* cup)
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{
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if(cup != currentCouple) {
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currentCouple = cup;
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currentMaterial = cup->GetMaterial();
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currentMaterialIndex = currentCouple->GetIndex();
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline
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G4double G4WentzelVIModel::GetLambda(G4double e)
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{
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G4double x;
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if(theLambdaTable) {
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G4bool b;
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x = ((*theLambdaTable)[currentMaterialIndex])->GetValue(e, b);
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} else {
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x = CrossSection(currentCouple,particle,e,
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(*currentCuts)[currentMaterialIndex]);
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}
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if(x > DBL_MIN) x = 1./x;
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else x = DBL_MAX;
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return x;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline
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void G4WentzelVIModel::SetupParticle(const G4ParticleDefinition* p)
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{
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// Initialise mass and charge
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if(p != particle) {
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particle = p;
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mass = particle->GetPDGMass();
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spin = particle->GetPDGSpin();
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G4double q = particle->GetPDGCharge()/eplus;
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chargeSquare = q*q;
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tkin = 0.0;
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lowEnergyLimit = keV*mass/electron_mass_c2;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline void G4WentzelVIModel::SetupKinematic(G4double ekin, G4double cut)
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{
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if(ekin != tkin || ecut != cut) {
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tkin = ekin;
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mom2 = tkin*(tkin + 2.0*mass);
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invbeta2 = 1.0 + mass*mass/mom2;
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cosTetMaxNuc = cosThetaMax;
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if(ekin <= 10.*cut && mass < MeV) {
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cosTetMaxNuc = ekin*(cosThetaMax + 1.0)/(10.*cut) - 1.0;
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}
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ComputeMaxElectronScattering(cut);
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline void G4WentzelVIModel::SetupTarget(G4double Z, G4double e)
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{
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if(Z != targetZ || e != etag) {
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etag = e;
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targetZ = Z;
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G4int iz= G4int(Z);
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if(iz > 99) iz = 99;
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G4double x = fNistManager->GetZ13(iz);
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screenZ = a0*x*x/mom2;
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if(iz > 1) screenZ *=(1.13 + 3.76*invbeta2*Z*Z*chargeSquare*alpha2);
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// screenZ = a0*x*x*(1.13 + 3.76*Z*Z*chargeSquare*alpha2)/mom2;
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// A.V. Butkevich et al., NIM A 488 (2002) 282
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formfactA = FF[iz];
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if(formfactA == 0.0) {
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x = fNistManager->GetA27(iz);
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formfactA = constn*x*x;
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FF[iz] = formfactA;
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}
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formfactA *= mom2;
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cosTetMaxNuc2 = cosTetMaxNuc;
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/*
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G4double ee = 10.*eV*Z;
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if(1 == iz) ee *= 2.0;
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G4double z = std::min(cosTetMaxElec, 1.0 - std::max(ecut,ee)*amu_c2
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*fNistManager->GetAtomicMassAmu(iz)/mom2);
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cosTetMaxElec2 = std::max(cosTetMaxNuc2, z);
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*/
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cosTetMaxElec2 = cosTetMaxElec;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#endif
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