Gabriele Cosmo
135 lines
4.4 KiB
C++
135 lines
4.4 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: G4RegularXrayTRmodel.cc,v 1.2 2004/12/07 09:00:05 gcosmo Exp $
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// GEANT4 tag $Name: geant4-07-00-cand-03 $
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//
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#include <complex>
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#include "G4RegularXrayTRmodel.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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G4RegularXrayTRmodel::G4RegularXrayTRmodel(G4Envelope *anEnvelope,
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G4double a, G4double b) :
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G4VXrayTRadModel(anEnvelope,a,b)
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{
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G4cout<<"Regular 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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BuildTable() ;
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}
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///////////////////////////////////////////////////////////////////////////
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G4RegularXrayTRmodel::~G4RegularXrayTRmodel()
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{
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;
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}
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///////////////////////////////////////////////////////////////////////////
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//
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// Approximation for radiator interference factor for the case of
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// fully Regular radiator. The plate and gas gap thicknesses are fixed .
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// 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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G4RegularXrayTRmodel::GetStackFactor( G4double energy,
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G4double gamma, G4double varAngle )
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{
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G4double result, Qa, Qb, Q, aZa, bZb, aMa, bMb, I2 ;
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aZa = fPlateThick/GetPlateFormationZone(energy,gamma,varAngle) ;
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bZb = fGasThick/GetGasFormationZone(energy,gamma,varAngle) ;
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aMa = fPlateThick*GetPlateLinearPhotoAbs(energy) ;
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bMb = fGasThick*GetGasLinearPhotoAbs(energy) ;
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Qa = std::exp(-aMa) ;
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Qb = std::exp(-bMb) ;
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Q = Qa*Qb ;
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// G4complex Ca(1.0+0.5*fPlateThick*Ma,fPlateThick/Za) ;
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// G4complex Cb(1.0+0.5*fGasThick*Mb,fGasThick/Zb) ;
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G4complex Ha( std::exp(-0.5*aMa)*std::cos(aZa),
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-std::exp(-0.5*aMa)*std::sin(aZa) ) ;
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G4complex Hb( std::exp(-0.5*bMb)*std::cos(bZb),
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-std::exp(-0.5*bMb)*std::sin(bZb) ) ;
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G4complex H = Ha*Hb ;
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G4complex Hs = std::conj(H) ;
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// G4complex F1 = ( 0.5*(1+Qa)*(1+H) - Ha - Qa*Hb )/(1-H) ;
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G4complex F2 = (1.0-Ha)*(Qa-Ha)*Hb*(1.0-Hs)*(Q-Hs) ;
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F2 *= std::pow(Q,G4double(fPlateNumber)) - std::pow(H,fPlateNumber) ;
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result = ( 1 - std::pow(Q,G4double(fPlateNumber)) )/( 1 - Q ) ;
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result *= (1 - Qa)*(1 + Qa - 2*std::sqrt(Qa)*std::cos(aZa)) ;
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result /= (1 - std::sqrt(Q))*(1 - std::sqrt(Q)) +
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4*std::sqrt(Q)*std::sin(0.5*(aZa+bZb))*std::sin(0.5*(aZa+bZb)) ;
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I2 = 2.0*std::real(F2) ;
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I2 /= (1 - std::sqrt(Q))*(1 - std::sqrt(Q)) +
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4*std::sqrt(Q)*std::sin(0.5*(aZa+bZb))*std::sin(0.5*(aZa+bZb)) ;
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I2 /= Q*( (std::sqrt(Q)-std::cos(aZa+bZb))*(std::sqrt(Q)-std::cos(aZa+bZb)) +
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std::sin(aZa+bZb)*std::sin(aZa+bZb) ) ;
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result += I2 ;
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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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