1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
17 | // * * |
---|
18 | // * This code implementation is the result of the scientific and * |
---|
19 | // * technical work of the GEANT4 collaboration. * |
---|
20 | // * By using, copying, modifying or distributing the software (or * |
---|
21 | // * any work based on the software) you agree to acknowledge its * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // |
---|
27 | // $Id: G4GammaXTRadiator.hh,v 1.4 2006/06/29 19:55:35 gunter Exp $ |
---|
28 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
---|
29 | // |
---|
30 | // |
---|
31 | /////////////////////////////////////////////////////////////////////////// |
---|
32 | // |
---|
33 | // Rough process describing a radiator of X-ray transition radiation. |
---|
34 | // Thicknesses of plates and gas gaps are distributed according to gamma |
---|
35 | // distribution. x are thicknesses of plates or gas gaps: |
---|
36 | // |
---|
37 | // p(x) = (alpha/<x>)^alpha * x^(alpha-1) * std::exp(-alpha*x/<x>) / G(alpha) |
---|
38 | // |
---|
39 | // G(alpha) is Euler's gamma function. |
---|
40 | // Plates have mean <x> = fPlateThick > 0 and power alpha = fAlphaPlate > 0 : |
---|
41 | // Gas gaps have mean <x> = fGasThick > 0 and power alpha = fAlphaGas > 0 : |
---|
42 | // We suppose that: |
---|
43 | // formation zone ~ mean thickness << absorption length |
---|
44 | // for each material and in the range 1-100 keV. This allows us to simplify |
---|
45 | // interference effects in radiator stack (GetStackFactor method). |
---|
46 | // |
---|
47 | // |
---|
48 | // History: |
---|
49 | // 21.01.02 V. Grichine, first version |
---|
50 | // |
---|
51 | |
---|
52 | |
---|
53 | #ifndef G4GammaXTRadiator_h |
---|
54 | #define G4GammaXTRadiator_h 1 |
---|
55 | |
---|
56 | #include "G4VXTRenergyLoss.hh" |
---|
57 | |
---|
58 | class G4GammaXTRadiator : public G4VXTRenergyLoss |
---|
59 | { |
---|
60 | public: |
---|
61 | |
---|
62 | G4GammaXTRadiator (G4LogicalVolume *anEnvelope, |
---|
63 | G4double,G4double, |
---|
64 | G4Material*,G4Material*, |
---|
65 | G4double,G4double,G4int, |
---|
66 | const G4String & processName = "XTRgammaRadiator"); |
---|
67 | ~G4GammaXTRadiator (); |
---|
68 | |
---|
69 | // Pure virtual function from base class |
---|
70 | |
---|
71 | G4double GetStackFactor( G4double energy, G4double gamma, G4double varAngle); |
---|
72 | |
---|
73 | private: |
---|
74 | |
---|
75 | }; |
---|
76 | |
---|
77 | #endif |
---|
78 | |
---|
79 | |
---|
80 | |
---|
81 | |
---|
82 | |
---|
83 | |
---|