Gabriele Cosmo
121 lines
4.1 KiB
C++
121 lines
4.1 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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//
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// $Id: G4GammaXTRadiator.cc,v 1.1 2002/01/22 15:22:53 grichine Exp $
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// GEANT4 tag $Name: geant4-05-01 $
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//
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#include "g4std/complex"
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#include "G4GammaXTRadiator.hh"
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#include "Randomize.hh"
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#include "G4Gamma.hh"
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////////////////////////////////////////////////////////////////////////////
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//
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// Constructor, destructor
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G4GammaXTRadiator::G4GammaXTRadiator(G4LogicalVolume* anEnvelope,
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G4double alphaPlate,
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G4double alphaGas,
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G4Material* foilMat,G4Material* gasMat,
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G4double a, G4double b, G4int n,
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const G4String& processName) :
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G4VXTRenergyLoss(anEnvelope,foilMat,gasMat,a,b,n,processName)
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{
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G4cout<<"Gammma distributed X-ray TR radiator model is called"<<G4endl ;
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// Build energy and angular integral spectra of X-ray TR photons from
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// a radiator
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fAlphaPlate = alphaPlate ;
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fAlphaGas = alphaGas ;
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G4cout<<"fAlphaPlate = "<<fAlphaPlate<<" ; fAlphaGas = "<<fAlphaGas<<G4endl ;
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BuildTable() ;
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}
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///////////////////////////////////////////////////////////////////////////
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G4GammaXTRadiator::~G4GammaXTRadiator()
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{
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;
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}
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///////////////////////////////////////////////////////////////////////////
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//
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// Rough approximation for radiator interference factor for the case of
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// fully GamDistr radiator. The plate and gas gap thicknesses are distributed
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// according to exponent. The mean values of the plate and gas gap thicknesses
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// are supposed to be about XTR formation zones but much less than
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// mean absorption length of XTR photons in coresponding material.
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G4double
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G4GammaXTRadiator::GetStackFactor( G4double energy,
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G4double gamma, G4double varAngle )
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{
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G4double result, Za, Zb, Ma, Mb ;
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Za = GetPlateFormationZone(energy,gamma,varAngle) ;
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Zb = GetGasFormationZone(energy,gamma,varAngle) ;
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Ma = GetPlateLinearPhotoAbs(energy) ;
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Mb = GetGasLinearPhotoAbs(energy) ;
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G4complex Ca(1.0+0.5*fPlateThick*Ma/fAlphaPlate,fPlateThick/Za/fAlphaPlate) ;
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G4complex Cb(1.0+0.5*fGasThick*Mb/fAlphaGas,fGasThick/Zb/fAlphaGas) ;
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G4complex Ha = G4std::pow(Ca,-fAlphaPlate) ;
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G4complex Hb = G4std::pow(Cb,-fAlphaGas) ;
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G4complex H = Ha*Hb ;
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G4complex F1 = (1.0 - Ha)*(1.0 - Hb )/(1.0 - H)
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* G4double(fPlateNumber) ;
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G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb/(1.0-H)/(1.0-H)
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* (1.0 - G4std::pow(H,fPlateNumber)) ;
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G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle) ;
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result = 2.0*G4std::real(R) ;
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return result ;
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}
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//
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//
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////////////////////////////////////////////////////////////////////////////
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