Gabriele Cosmo
125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
//
|
|
// ********************************************************************
|
|
// * DISCLAIMER *
|
|
// * *
|
|
// * The following disclaimer summarizes all the specific disclaimers *
|
|
// * of contributors to this software. The specific disclaimers,which *
|
|
// * govern, are listed with their locations in: *
|
|
// * http://cern.ch/geant4/license *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. *
|
|
// * *
|
|
// * This code implementation is the intellectual property of the *
|
|
// * GEANT4 collaboration. *
|
|
// * By copying, distributing or modifying the Program (or any work *
|
|
// * based on the Program) you indicate your acceptance of this *
|
|
// * statement, and all its terms. *
|
|
// ********************************************************************
|
|
//
|
|
//
|
|
// $Id: G4GamDistrXrayTRmodel.cc,v 1.3 2001/07/11 10:01:31 gunter Exp $
|
|
// GEANT4 tag $Name: geant4-05-01 $
|
|
//
|
|
|
|
#include "g4std/complex"
|
|
|
|
#include "G4GamDistrXrayTRmodel.hh"
|
|
#include "Randomize.hh"
|
|
|
|
#include "G4Gamma.hh"
|
|
|
|
////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Constructor, destructor
|
|
|
|
G4GamDistrXrayTRmodel::G4GamDistrXrayTRmodel(G4Envelope *anEnvelope,
|
|
G4double a, G4double alphaPlate,
|
|
G4double b, G4double alphaGas) :
|
|
G4VXrayTRadModel(anEnvelope,a,b)
|
|
{
|
|
G4cout<<"Gammma distributed X-ray TR radiator model is called"<<G4endl ;
|
|
|
|
// Build energy and angular integral spectra of X-ray TR photons from
|
|
// a radiator
|
|
|
|
fAlphaPlate = alphaPlate ;
|
|
fAlphaGas = alphaGas ;
|
|
G4cout<<"fAlphaPlate = "<<fAlphaPlate<<" ; fAlphaGas = "<<fAlphaGas<<G4endl ;
|
|
|
|
BuildTable() ;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
G4GamDistrXrayTRmodel::~G4GamDistrXrayTRmodel()
|
|
{
|
|
;
|
|
}
|
|
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Rough approximation for radiator interference factor for the case of
|
|
// fully GamDistr radiator. The plate and gas gap thicknesses are distributed
|
|
// according to exponent. The mean values of the plate and gas gap thicknesses
|
|
// are supposed to be about XTR formation zones but much less than
|
|
// mean absorption length of XTR photons in coresponding material.
|
|
|
|
G4double
|
|
G4GamDistrXrayTRmodel::GetStackFactor( G4double energy,
|
|
G4double gamma, G4double varAngle )
|
|
{
|
|
G4double result, Qa, Qb, Q, Za, Zb, Ma, Mb ;
|
|
|
|
Za = GetPlateFormationZone(energy,gamma,varAngle) ;
|
|
Zb = GetGasFormationZone(energy,gamma,varAngle) ;
|
|
|
|
Ma = GetPlateLinearPhotoAbs(energy) ;
|
|
Mb = GetGasLinearPhotoAbs(energy) ;
|
|
|
|
Qa = ( 1.0 + fPlateThick*Ma/fAlphaPlate ) ;
|
|
Qa = pow(Qa,-fAlphaPlate) ;
|
|
Qb = ( 1.0 + fGasThick*Mb/fAlphaGas ) ;
|
|
Qb = pow(Qb,-fAlphaGas) ;
|
|
Q = Qa*Qb ;
|
|
|
|
G4complex Ca(1.0+0.5*fPlateThick*Ma/fAlphaPlate,fPlateThick/Za/fAlphaPlate) ;
|
|
G4complex Cb(1.0+0.5*fGasThick*Mb/fAlphaGas,fGasThick/Zb/fAlphaGas) ;
|
|
|
|
G4complex Ha = G4std::pow(Ca,-fAlphaPlate) ;
|
|
G4complex Hb = G4std::pow(Cb,-fAlphaGas) ;
|
|
G4complex H = Ha*Hb ;
|
|
|
|
G4complex F1 = ( 0.5*(1+Qa)*(1.0+H) - Ha - Qa*Hb )/(1.0-H) ;
|
|
|
|
G4complex F2 = (1.0-Ha)*(Qa-Ha)*Hb/(1.0-H)/(Q-H) ;
|
|
|
|
F2 *= pow(Q,G4double(fPlateNumber)) - G4std::pow(H,fPlateNumber) ;
|
|
|
|
result = ( 1 - pow(Q,G4double(fPlateNumber)) )/( 1 - Q ) ;
|
|
|
|
result *= 2.0*G4std::real(F1) ;
|
|
|
|
result += 2.0*G4std::real(F2) ;
|
|
|
|
return result ;
|
|
}
|
|
|
|
|
|
//
|
|
//
|
|
////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|