Gabriele Cosmo
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
// This code implementation is the intellectual property of
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// the RD44 GEANT4 collaboration.
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//
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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 statement,
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// and all its terms.
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//
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// $Id: G4GamDistrXrayTRmodel.hh,v 1.1 2000/11/14 16:05:31 gcosmo Exp $
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// GEANT4 tag $Name: geant4-03-01 $
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//
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//
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///////////////////////////////////////////////////////////////////////////
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//
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// Rough model describing a radiator of X-ray transition radiation.
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// Thicknesses of plates and gas gaps are distributed according to gamma
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// distribution. x are thicknesses of plates or gas gaps:
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//
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// p(x) = (alpha/<x>)^alpha * x^(alpha-1) * exp(-alpha*x/<x>) / G(alpha)
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//
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// G(alpha) is Euler's gamma function.
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// Plates have mean <x> = fPlateThick > 0 and power alpha = fAlphaPlate > 0 :
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// Gas gaps have mean <x> = fGasThick > 0 and power alpha = fAlphaGas > 0 :
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// We suppose that:
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// formation zone ~ mean thickness << absorption length
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// for each material and in the range 1-100 keV. This allows us to simplify
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// interference effects in radiator stack (GetStackFactor method).
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//
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//
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// History:
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// 11.02.00 V. Grichine, first version
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//
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#ifndef G4GamDistrXrayTRmodel_h
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#define G4GamDistrXrayTRmodel_h 1
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#include "G4VFastSimulationModel.hh"
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// #include "G4ForwardXrayTR.hh"
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#include "G4VXrayTRmodel.hh"
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class G4GamDistrXrayTRmodel : public G4VXrayTRmodel
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{
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public:
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G4GamDistrXrayTRmodel (G4LogicalVolume *anEnvelope,
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G4double,G4double,
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G4double,G4double );
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~G4GamDistrXrayTRmodel ();
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// Pure virtual function from base class
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G4double GetStackFactor( G4double energy, G4double gamma, G4double varAngle);
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private:
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G4double fAlphaPlate, fAlphaGas ;
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};
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#endif
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