Gabriele Cosmo
232 lines
7.7 KiB
C++
232 lines
7.7 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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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 statement,
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// and all its terms.
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//
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// $Id: G4IonisParamMat.cc,v 1.2.8.1 1999/12/07 20:49:19 gunter Exp $
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// GEANT4 tag $Name: geant4-01-01 $
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//
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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// 18-07-98, bug corrected in ComputeDensityEffect() for gas
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// 09-07-98, data moved from G4Material, M.Maire
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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#include "G4IonisParamMat.hh"
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#include "G4Material.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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G4IonisParamMat::G4IonisParamMat(G4Material* material)
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:fMaterial(material)
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{
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ComputeMeanParameters();
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ComputeDensityEffect();
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ComputeFluctModel();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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void G4IonisParamMat::ComputeMeanParameters()
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{
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// compute mean excitation energy and shell correction vector
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fTaul = (*(fMaterial->GetElementVector()))[0]->GetIonisation()->GetTaul();
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fLogMeanExcEnergy = 0.;
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for (G4int i=0; i < fMaterial->GetNumberOfElements(); i++)
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fLogMeanExcEnergy += (fMaterial->GetVecNbOfAtomsPerVolume())[i]
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*((*(fMaterial->GetElementVector()))[i]->GetZ())
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*log((*(fMaterial->GetElementVector()))[i]->GetIonisation()
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->GetMeanExcitationEnergy());
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fLogMeanExcEnergy /= fMaterial->GetTotNbOfElectPerVolume();
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fMeanExcitationEnergy = exp(fLogMeanExcEnergy);
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fShellCorrectionVector = new G4double[3];
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for (G4int j=0; j<=2; j++)
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{
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fShellCorrectionVector[j] = 0.;
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for (G4int k=0; k<fMaterial->GetNumberOfElements(); k++)
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fShellCorrectionVector[j] += (fMaterial->GetVecNbOfAtomsPerVolume())[k]
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*((*(fMaterial->GetElementVector()))[k]->GetIonisation()
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->GetShellCorrectionVector()[j]);
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fShellCorrectionVector[j] /= fMaterial->GetTotNbOfElectPerVolume();
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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void G4IonisParamMat::ComputeDensityEffect()
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{
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// Compute parameters for the density effect correction in DE/Dx formula.
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// The parametrization is from R.M. Sternheimer, Phys. Rev.B,3:3681 (1971)
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const G4double Cd2 = 4*pi*hbarc_squared*classic_electr_radius;
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const G4double twoln10 = 2.*log(10.);
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G4int icase;
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fCdensity = 1. + log(fMeanExcitationEnergy*fMeanExcitationEnergy
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/(Cd2*fMaterial->GetTotNbOfElectPerVolume()));
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//
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// condensed materials
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//
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G4State State = fMaterial->GetState();
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if ((State == kStateSolid)||(State == kStateLiquid)) {
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const G4double E100keV = 100.*keV;
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const G4double ClimiS[] = {3.681 , 5.215 };
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const G4double X0valS[] = {1.0 , 1.5 };
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const G4double X1valS[] = {2.0 , 3.0 };
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if(fMeanExcitationEnergy < E100keV) icase = 0 ;
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else icase = 1 ;
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if(fCdensity < ClimiS[icase]) fX0density = 0.2;
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else fX0density = 0.326*fCdensity-X0valS[icase];
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fX1density = X1valS[icase] ; fMdensity = 3.0;
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//special: Hydrogen
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if ((fMaterial->GetNumberOfElements()==1)&&(fMaterial->GetZ()==1.)) {
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fX0density = 0.425; fX1density = 2.0; fMdensity = 5.949;
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}
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}
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//
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// gases
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//
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if (State == kStateGas) {
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const G4double ClimiG[] = { 10. , 10.5 , 11. , 11.5 , 12.25 , 13.804};
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const G4double X0valG[] = { 1.6 , 1.7 , 1.8 , 1.9 , 2.0 , 2.0 };
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const G4double X1valG[] = { 4.0 , 4.0 , 4.0 , 4.0 , 4.0 , 5.0 };
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icase = 5;
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fX0density = 0.326*fCdensity-2.5 ; fX1density = 5.0 ; fMdensity = 3. ;
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while((icase > 0)&&(fCdensity < ClimiG[icase])) icase-- ;
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fX0density = X0valG[icase] ; fX1density = X1valG[icase] ;
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//special: Hydrogen
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if ((fMaterial->GetNumberOfElements()==1)&&(fMaterial->GetZ()==1.)) {
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fX0density = 1.837; fX1density = 3.0; fMdensity = 4.754;
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}
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//special: Helium
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if ((fMaterial->GetNumberOfElements()==1)&&(fMaterial->GetZ()==2.)) {
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fX0density = 2.191; fX1density = 3.0; fMdensity = 3.297;
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}
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// change parameters if the gas is not in STP.
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// For the correction the density(STP) is needed. Density(STP) is calculated here :
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G4double Density = fMaterial->GetDensity();
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G4double Pressure = fMaterial->GetPressure();
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G4double Temp = fMaterial->GetTemperature();
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G4double DensitySTP = Density*STP_Pressure*Temp/(Pressure*STP_Temperature);
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G4double ParCorr = log(Density/DensitySTP) ;
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fCdensity -= ParCorr;
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fX0density -= ParCorr/twoln10 ;
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fX1density -= ParCorr/twoln10 ;
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}
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G4double Xa = fCdensity/twoln10 ;
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fAdensity = twoln10*(Xa-fX0density)
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/pow((fX1density-fX0density),fMdensity);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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void G4IonisParamMat::ComputeFluctModel()
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{
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// compute parameters for the energy loss fluctuation model
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// need an 'effective Z' ?????
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G4double Zeff = 0.;
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for (G4int i=0;i<fMaterial->GetNumberOfElements();i++)
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Zeff += (fMaterial->GetFractionVector())[i]
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*((*(fMaterial->GetElementVector()))[i]->GetZ());
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if (Zeff > 2.) fF2fluct = 2./Zeff ;
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else fF2fluct = 0.;
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fF1fluct = 1. - fF2fluct;
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fEnergy2fluct = 10.*Zeff*Zeff*eV;
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fLogEnergy2fluct = log(fEnergy2fluct);
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fLogEnergy1fluct = (fLogMeanExcEnergy - fF2fluct*fLogEnergy2fluct)
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/fF1fluct;
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fEnergy1fluct = exp(fLogEnergy1fluct);
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fEnergy0fluct = 10.*eV;
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fRateionexcfluct = 0.4;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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G4IonisParamMat::~G4IonisParamMat()
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{ }
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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G4IonisParamMat::G4IonisParamMat(const G4IonisParamMat &right)
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{
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*this = right;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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const G4IonisParamMat& G4IonisParamMat::operator=(const G4IonisParamMat& right)
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{
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if (this != &right)
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{
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fMaterial = right.fMaterial;
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fMeanExcitationEnergy = right.fMeanExcitationEnergy;
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fLogMeanExcEnergy = right.fLogMeanExcEnergy;
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fShellCorrectionVector = right.fShellCorrectionVector;
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fTaul = right.fTaul;
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fCdensity = right.fCdensity;
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fMdensity = right.fMdensity;
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fAdensity = right.fAdensity;
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fX0density = right.fX0density;
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fX1density = right.fX1density;
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fF1fluct = right.fF1fluct;
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fF2fluct = right.fF2fluct;
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fEnergy1fluct = right.fEnergy1fluct;
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fLogEnergy1fluct = right.fLogEnergy1fluct;
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fEnergy2fluct = right.fEnergy2fluct;
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fLogEnergy2fluct = right.fLogEnergy2fluct;
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fEnergy0fluct = right.fEnergy0fluct;
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fRateionexcfluct = right.fRateionexcfluct;
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}
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return *this;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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G4int G4IonisParamMat::operator==(const G4IonisParamMat &right) const
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{
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return (this == (G4IonisParamMat *) &right);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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G4int G4IonisParamMat::operator!=(const G4IonisParamMat &right) const
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{
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return (this != (G4IonisParamMat *) &right);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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