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: RemSimPrimaryGeneratorAction.cc,v 1.17 2006/06/29 16:24:09 gunter Exp $// Author: Susanna Guatelli, guatelli@ge.infn.it |
---|
28 | |
---|
29 | #include "RemSimPrimaryGeneratorAction.hh" |
---|
30 | #ifdef G4ANALYSIS_USE |
---|
31 | #include "RemSimAnalysisManager.hh" |
---|
32 | #endif |
---|
33 | #include "G4Event.hh" |
---|
34 | #include "G4ParticleGun.hh" |
---|
35 | #include "G4ParticleTable.hh" |
---|
36 | #include "G4ParticleDefinition.hh" |
---|
37 | #include "Randomize.hh" |
---|
38 | #include <fstream> |
---|
39 | #include "G4DataVector.hh" |
---|
40 | #include "RemSimPrimaryGeneratorMessenger.hh" |
---|
41 | #include <math.h> |
---|
42 | |
---|
43 | RemSimPrimaryGeneratorAction::RemSimPrimaryGeneratorAction() |
---|
44 | { |
---|
45 | readFile = false; |
---|
46 | |
---|
47 | particleGun = new G4ParticleGun(1); |
---|
48 | messenger = new RemSimPrimaryGeneratorMessenger(this); |
---|
49 | |
---|
50 | energies = new G4DataVector; |
---|
51 | data = new G4DataVector; |
---|
52 | |
---|
53 | size = 0; |
---|
54 | |
---|
55 | G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable(); |
---|
56 | G4String ParticleName = "proton"; |
---|
57 | G4ParticleDefinition* particle = particleTable->FindParticle(ParticleName); |
---|
58 | |
---|
59 | particleGun->SetParticleDefinition(particle); |
---|
60 | |
---|
61 | // Default values of the primary generator |
---|
62 | G4ThreeVector position(0,0,-25. *m); |
---|
63 | particleGun -> SetParticlePosition(position); |
---|
64 | G4ThreeVector direction(0., 0., 1.); |
---|
65 | particleGun -> SetParticleMomentumDirection(direction); |
---|
66 | particleGun -> SetParticleEnergy(250. * MeV); |
---|
67 | } |
---|
68 | |
---|
69 | RemSimPrimaryGeneratorAction::~RemSimPrimaryGeneratorAction() |
---|
70 | { |
---|
71 | delete data; |
---|
72 | delete energies; |
---|
73 | delete [] cumulate; |
---|
74 | delete [] energy; |
---|
75 | delete messenger; |
---|
76 | delete particleGun; |
---|
77 | } |
---|
78 | |
---|
79 | G4double RemSimPrimaryGeneratorAction::GetInitialEnergy() |
---|
80 | { |
---|
81 | G4double primaryParticleEnergy = particleGun -> GetParticleEnergy(); |
---|
82 | return primaryParticleEnergy; |
---|
83 | } |
---|
84 | |
---|
85 | void RemSimPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent) |
---|
86 | { |
---|
87 | G4int baryon = particleGun -> GetParticleDefinition() -> GetBaryonNumber(); |
---|
88 | |
---|
89 | // Generate the energy spectrum of primary particles according to |
---|
90 | // the flux reported in the .txt file (firt column = Energy (MeV/nucl), |
---|
91 | // second column = differnetila flux). The fluxes are derived from CREME96 |
---|
92 | if (readFile == true) |
---|
93 | { |
---|
94 | // Uniform number between 0. and 1. |
---|
95 | G4double random = G4UniformRand(); |
---|
96 | |
---|
97 | G4int nbelow = 0; // largest k such that I[k] is known to be <= rand |
---|
98 | G4int nabove = size; // largest k such that I[k] is known to be > rand |
---|
99 | G4int middle; |
---|
100 | |
---|
101 | while (nabove > nbelow+1) { |
---|
102 | middle = (nabove + nbelow+1)>>1; |
---|
103 | if (random >= cumulate[middle]) { |
---|
104 | nbelow = middle; |
---|
105 | } else { |
---|
106 | nabove = middle; |
---|
107 | } |
---|
108 | } |
---|
109 | |
---|
110 | // Linear interpolation |
---|
111 | |
---|
112 | G4double energy_gun = 0. * MeV; |
---|
113 | |
---|
114 | G4double binMeasure = cumulate[nabove] - cumulate[nbelow]; |
---|
115 | |
---|
116 | if ( binMeasure == 0 ) { |
---|
117 | |
---|
118 | energy_gun = (energy[nbelow] + random*(energy[nabove] - energy[nbelow]))* baryon; |
---|
119 | G4cout<<"BinMeasure is zero !!!!!"<<G4endl; |
---|
120 | } |
---|
121 | |
---|
122 | else |
---|
123 | { |
---|
124 | G4double binFraction = (random - cumulate[nbelow]) / binMeasure; |
---|
125 | energy_gun = energy[nbelow] + binFraction *(energy[nabove] - energy[nbelow]); |
---|
126 | } |
---|
127 | particleGun -> SetParticleEnergy(energy_gun * baryon); |
---|
128 | } |
---|
129 | |
---|
130 | #ifdef G4ANALYSIS_USE |
---|
131 | G4double energy_plot = (particleGun -> GetParticleEnergy())/baryon; |
---|
132 | // plot of MeV/nucl |
---|
133 | RemSimAnalysisManager* analysis = RemSimAnalysisManager::getInstance(); |
---|
134 | // Plot the energy spectrum of primary particles |
---|
135 | analysis -> primaryParticleEnergyDistribution(energy_plot/MeV); |
---|
136 | #endif |
---|
137 | |
---|
138 | particleGun -> GeneratePrimaryVertex(anEvent); |
---|
139 | } |
---|
140 | |
---|
141 | void RemSimPrimaryGeneratorAction::ReadProbability(G4String fileName) |
---|
142 | { |
---|
143 | // This method allows to read the .txt files containing the |
---|
144 | // fluxes of the galactic cosmic rays derived form CREME96 |
---|
145 | readFile = true; |
---|
146 | |
---|
147 | std::ifstream file(fileName, std::ios::in); |
---|
148 | std::filebuf* lsdp = file.rdbuf(); |
---|
149 | |
---|
150 | if (! (lsdp->is_open()) ) |
---|
151 | { |
---|
152 | G4String excep = "RemSimPrimaryGenerator - data file: " |
---|
153 | + fileName + " not found"; |
---|
154 | G4Exception(excep); |
---|
155 | } |
---|
156 | |
---|
157 | G4double a = 0; |
---|
158 | G4int index = 0; |
---|
159 | G4int k = 1; |
---|
160 | |
---|
161 | do |
---|
162 | { |
---|
163 | file >> a; |
---|
164 | G4int nColumns = 2; |
---|
165 | // The file is organized into two columns: |
---|
166 | // column contains the probability distribution |
---|
167 | // The file terminates with the pattern: -1 |
---|
168 | // -2 |
---|
169 | if (a == -1 || a == -2) |
---|
170 | { |
---|
171 | |
---|
172 | } |
---|
173 | else |
---|
174 | { |
---|
175 | if (k%nColumns != 0) |
---|
176 | { |
---|
177 | G4double energy = a *MeV; |
---|
178 | energies -> push_back(energy); |
---|
179 | // G4cout << "energy: " << energy << G4endl; |
---|
180 | k++; |
---|
181 | } |
---|
182 | else if (k%nColumns == 0) |
---|
183 | { |
---|
184 | G4double data_value = a; |
---|
185 | data -> push_back(data_value); |
---|
186 | //G4cout<< "probability: "<< data_value << G4endl; |
---|
187 | k=1; |
---|
188 | index++; |
---|
189 | } |
---|
190 | } |
---|
191 | } while (a != -2); // end of file |
---|
192 | |
---|
193 | file.close(); |
---|
194 | size = index -1 ; |
---|
195 | cumulate = new G4double[size+1]; |
---|
196 | energy = new G4double[size+1]; |
---|
197 | cumulate[0] = 0; |
---|
198 | energy [0] = (*energies)[0]; |
---|
199 | |
---|
200 | for (G4int ptn = 0; ptn <size; ptn++ ) { |
---|
201 | |
---|
202 | G4double yy = ((*data)[ptn+1] + (*data)[ptn])/2.; |
---|
203 | G4double weight = yy *((*energies)[ptn +1] - (*energies)[ptn]); |
---|
204 | cumulate[ptn +1] = cumulate[ptn] + weight; |
---|
205 | energy[ptn+1] = (*energies)[ptn+1]; |
---|
206 | } |
---|
207 | |
---|
208 | // Normalise the cumulate to 1 (that corresponds to the last value) |
---|
209 | for ( G4int ptn= 0; ptn < size + 1; ptn++ ) |
---|
210 | { |
---|
211 | cumulate[ptn] /= cumulate[size]; |
---|
212 | } |
---|
213 | } |
---|
214 | |
---|
215 | |
---|