Gabriele Cosmo
118 lines
3.9 KiB
C++
118 lines
3.9 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: G4GamDistrXTRdEdx.cc,v 1.3 2001/09/18 09:02:02 gcosmo Exp $
|
|
// GEANT4 tag $Name: geant4-05-00 $
|
|
//
|
|
|
|
#include "g4std/complex"
|
|
|
|
#include "G4GamDistrXTRdEdx.hh"
|
|
#include "Randomize.hh"
|
|
|
|
#include "G4Gamma.hh"
|
|
|
|
////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Constructor, destructor
|
|
|
|
G4GamDistrXTRdEdx::G4GamDistrXTRdEdx(G4Envelope *anEnvelope,
|
|
G4double a, G4double alphaPlate,
|
|
G4double b, G4double alphaGas) :
|
|
G4VXTRdEdx(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() ;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
G4GamDistrXTRdEdx::~G4GamDistrXTRdEdx()
|
|
{
|
|
;
|
|
}
|
|
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// 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
|
|
G4GamDistrXTRdEdx::GetStackFactor( G4double energy,
|
|
G4double gamma, G4double varAngle )
|
|
{
|
|
G4double result, Za, Zb, Ma, Mb ;
|
|
|
|
Za = GetPlateFormationZone(energy,gamma,varAngle) ;
|
|
Zb = GetGasFormationZone(energy,gamma,varAngle) ;
|
|
|
|
Ma = GetPlateLinearPhotoAbs(energy) ;
|
|
Mb = GetGasLinearPhotoAbs(energy) ;
|
|
|
|
|
|
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 = (1.0 - Ha)*(1.0 - Hb )/(1.0 - H)
|
|
* G4double(fPlateNumber) ;
|
|
|
|
G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb/(1.0-H)/(1.0-H)
|
|
* (1.0 - G4std::pow(H,fPlateNumber)) ;
|
|
|
|
G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle) ;
|
|
|
|
result = 2.0*G4std::real(R) ;
|
|
|
|
return result ;
|
|
}
|
|
|
|
|
|
//
|
|
//
|
|
////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|