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 | // Unit test for Cherenkov models in media with random fluctuations |
---|
28 | // |
---|
29 | // 18.05.07 V. Grichine |
---|
30 | // |
---|
31 | // |
---|
32 | |
---|
33 | #include "G4ios.hh" |
---|
34 | #include <fstream> |
---|
35 | #include <cmath> |
---|
36 | #include "globals.hh" |
---|
37 | #include "Randomize.hh" |
---|
38 | #include "G4UnitsTable.hh" |
---|
39 | #include <iomanip> |
---|
40 | #include <complex> |
---|
41 | |
---|
42 | |
---|
43 | #include "G4Element.hh" |
---|
44 | #include "G4NistManager.hh" |
---|
45 | |
---|
46 | |
---|
47 | G4double epsilon = 1.2; // 1.05; |
---|
48 | |
---|
49 | G4double cof = (fine_structure_const/hbarc)*1.*eV; // *50.*0.9*0.3; |
---|
50 | |
---|
51 | // cof *= 50.*0.9*0.3; // T=0.9, Q=0.3, 1 eV of energy range |
---|
52 | |
---|
53 | using namespace std; |
---|
54 | |
---|
55 | |
---|
56 | /////////////////////////////////////////////////////////// |
---|
57 | // |
---|
58 | // CR spectrum in transparent medium with fluctuations |
---|
59 | |
---|
60 | G4double RandomSpectrum(G4double ratio, G4double x) |
---|
61 | { |
---|
62 | G4double result; |
---|
63 | G4double beta2 = x/(1+x); |
---|
64 | G4complex a = G4complex(epsilon*std::sqrt(1.-ratio*ratio)*beta2, ratio*epsilon*beta2); |
---|
65 | G4complex b = 1. - 1./a; |
---|
66 | G4complex ln = std::log(1./(1.-a)); |
---|
67 | G4complex bln = b*ln; |
---|
68 | |
---|
69 | result = imag(bln); |
---|
70 | result *= cof/pi; |
---|
71 | |
---|
72 | return result; |
---|
73 | } |
---|
74 | |
---|
75 | ///////////////////////////////////////////////////////////////////////// |
---|
76 | // |
---|
77 | // Tamm-Frank spectrum of transparent uniform medium |
---|
78 | |
---|
79 | G4double TammFrank(G4double x) |
---|
80 | { |
---|
81 | G4double result; |
---|
82 | G4double beta2 = x/(1+x); |
---|
83 | G4double a = epsilon*beta2; |
---|
84 | |
---|
85 | if( a < 1.) result = DBL_MIN; |
---|
86 | else result = cof*(1.-1./a); |
---|
87 | |
---|
88 | return result; |
---|
89 | } |
---|
90 | |
---|
91 | |
---|
92 | |
---|
93 | |
---|
94 | |
---|
95 | int main() |
---|
96 | { |
---|
97 | |
---|
98 | G4int i, iMax; |
---|
99 | |
---|
100 | std::ofstream writef("crspectrum.dat", std::ios::out ) ; |
---|
101 | writef.setf( std::ios::scientific, std::ios::floatfield ); |
---|
102 | |
---|
103 | G4double betagamma, bg2, r, momentum; // , picr, kcr; |
---|
104 | G4double tf, cr1, cr2, cr3, cr4; |
---|
105 | iMax = 100; // 150; |
---|
106 | |
---|
107 | writef<<iMax<<G4endl; |
---|
108 | |
---|
109 | for( i = 0; i < iMax; i++ ) |
---|
110 | { |
---|
111 | |
---|
112 | momentum = std::exp(i*0.1)*0.1*MeV; |
---|
113 | |
---|
114 | betagamma = momentum; // /139.57018*MeV; |
---|
115 | bg2 = betagamma*betagamma; |
---|
116 | |
---|
117 | r = 0.7; |
---|
118 | cr1 = RandomSpectrum(r,bg2); |
---|
119 | |
---|
120 | r = 0.1; |
---|
121 | cr2 = RandomSpectrum(r,bg2); |
---|
122 | |
---|
123 | // picr = RandomSpectrum(r,bg2); |
---|
124 | |
---|
125 | //betagamma = momentum/493.677*MeV; |
---|
126 | // bg2 = betagamma*betagamma; |
---|
127 | // kcr = RandomSpectrum(r,bg2); |
---|
128 | |
---|
129 | |
---|
130 | // r = 0.01; |
---|
131 | // cr3 = RandomSpectrum(r,bg2); |
---|
132 | |
---|
133 | r = 0.001; |
---|
134 | cr4 = RandomSpectrum(r,bg2); |
---|
135 | |
---|
136 | tf = TammFrank(bg2); |
---|
137 | |
---|
138 | // G4cout<<momentum<<"\t"<<picr<<"\t"<<kcr<<G4endl; |
---|
139 | // writef<<momentum<<"\t"<<picr<<"\t"<<kcr<<G4endl; |
---|
140 | |
---|
141 | G4cout<<momentum<<"\t"<<tf<<"\t"<<cr4<<"\t"<<cr2<<"\t"<<cr1<<G4endl; |
---|
142 | writef<<momentum<<"\t"<<tf<<"\t"<<cr4<<"\t"<<cr2<<"\t"<<cr1<<G4endl; |
---|
143 | |
---|
144 | |
---|
145 | } |
---|
146 | |
---|
147 | return 1; |
---|
148 | } // end of main |
---|