Gabriele Cosmo
75 lines
2.9 KiB
C++
75 lines
2.9 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: G4GamDistrXrayTRmodel.hh,v 1.2 2004/12/07 09:00:04 gcosmo Exp $
|
|
// GEANT4 tag $Name: geant4-07-00-cand-03 $
|
|
//
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Rough model describing a radiator of X-ray transition radiation.
|
|
// Thicknesses of plates and gas gaps are distributed according to gamma
|
|
// distribution. x are thicknesses of plates or gas gaps:
|
|
//
|
|
// p(x) = (alpha/<x>)^alpha * x^(alpha-1) * std::exp(-alpha*x/<x>) / G(alpha)
|
|
//
|
|
// G(alpha) is Euler's gamma function.
|
|
// Plates have mean <x> = fPlateThick > 0 and power alpha = fAlphaPlate > 0 :
|
|
// Gas gaps have mean <x> = fGasThick > 0 and power alpha = fAlphaGas > 0 :
|
|
// We suppose that:
|
|
// formation zone ~ mean thickness << absorption length
|
|
// for each material and in the range 1-100 keV. This allows us to simplify
|
|
// interference effects in radiator stack (GetStackFactor method).
|
|
//
|
|
//
|
|
// History:
|
|
// 11.02.00 V. Grichine, first version
|
|
//
|
|
|
|
|
|
#ifndef G4GamDistrXrayTRmodel_h
|
|
#define G4GamDistrXrayTRmodel_h 1
|
|
|
|
#include "G4VXrayTRadModel.hh"
|
|
#include "G4VFastSimulationModel.hh"
|
|
|
|
class G4GamDistrXrayTRmodel : public G4VXrayTRadModel
|
|
{
|
|
public:
|
|
|
|
G4GamDistrXrayTRmodel (G4LogicalVolume *anEnvelope,
|
|
G4double,G4double,
|
|
G4double,G4double );
|
|
~G4GamDistrXrayTRmodel ();
|
|
|
|
// Pure virtual function from base class
|
|
|
|
G4double GetStackFactor( G4double energy, G4double gamma, G4double varAngle);
|
|
|
|
private:
|
|
|
|
G4double fAlphaPlate, fAlphaGas ;
|
|
};
|
|
|
|
#endif
|