Gabriele Cosmo
124 lines
4.0 KiB
C++
124 lines
4.0 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: G4RegularXTRadiator.cc,v 1.2 2002/01/18 17:26:21 grichine Exp $
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// GEANT4 tag $Name: geant4-04-01 $
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//
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#include "g4std/complex"
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#include "G4RegularXTRadiator.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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G4RegularXTRadiator::G4RegularXTRadiator(G4LogicalVolume *anEnvelope,
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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<<"Regular X-ray TR radiator EM process 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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G4RegularXTRadiator::~G4RegularXTRadiator()
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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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G4RegularXTRadiator::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, D ;
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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 = exp(-aMa) ;
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Qb = exp(-bMb) ;
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Q = Qa*Qb ;
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G4complex Ha( exp(-0.5*aMa)*cos(aZa),
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-exp(-0.5*aMa)*sin(aZa) ) ;
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G4complex Hb( exp(-0.5*bMb)*cos(bZb),
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-exp(-0.5*bMb)*sin(bZb) ) ;
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G4complex H = Ha*Hb ;
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G4complex Hs = G4std::conj(H) ;
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D = 1.0 /( (1 - sqrt(Q))*(1 - sqrt(Q)) +
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4*sqrt(Q)*sin(0.5*(aZa+bZb))*sin(0.5*(aZa+bZb)) ) ;
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G4complex F1 = (1.0 - Ha)*(1.0 - Hb)*(1.0 - Hs)
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* G4double(fPlateNumber)*D ;
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G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb*(1.0-Hs)*(1.0-Hs)
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* (1.0 - G4std::pow(H,fPlateNumber)) * D*D ;
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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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