Gabriele Cosmo
70 lines
3.2 KiB
C++
70 lines
3.2 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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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. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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///////////////////////////////////////////////////////////////////////////
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//
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// Rough process 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) * std::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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// History:
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// 21.01.02 V. Grichine, first version
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//
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#ifndef G4GammaXTRadiator_h
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#define G4GammaXTRadiator_h 1
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#include "G4LogicalVolume.hh"
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#include "G4Material.hh"
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#include "G4VXTRenergyLoss.hh"
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class G4GammaXTRadiator : public G4VXTRenergyLoss
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{
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public:
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explicit G4GammaXTRadiator(G4LogicalVolume* anEnvelope, G4double, G4double,
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G4Material*, G4Material*, G4double, G4double,
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G4int,
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const G4String& processName = "XTRgammaRadiator");
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~G4GammaXTRadiator();
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void ProcessDescription(std::ostream&) const override;
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void DumpInfo() const override { ProcessDescription(G4cout); };
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G4double GetStackFactor(G4double energy, G4double gamma,
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G4double varAngle) override;
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};
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#endif
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