G4FissionStore.cc

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00025 //
00026 // $Id$
00027 //
00028 // 20100728  Move ::addConfig() implementation to .cc file
00029 // 20110801  Make configuration probs a data member array, reduce memory churn
00030 // 20110922  Replace config::print() with stream output.
00031 
00032 #include "G4FissionStore.hh"
00033 #include "G4FissionConfiguration.hh"
00034 #include <cmath>
00035 
00036 G4FissionStore::G4FissionStore() : verboseLevel(0) {
00037   if (verboseLevel > 1) 
00038     G4cout << " >>> G4FissionStore::G4FissionStore" << G4endl;
00039 }
00040 
00041 void G4FissionStore::addConfig(G4double a, G4double z, G4double ez, 
00042                                G4double ek, G4double ev) {
00043   G4FissionConfiguration config(a, z, ez, ek, ev);
00044   configurations.push_back(config);
00045   if (verboseLevel > 2) G4cout << config << G4endl;
00046 }
00047 
00048 G4FissionConfiguration G4FissionStore::generateConfiguration(G4double amax, 
00049                                                              G4double rand) const {
00050   if (verboseLevel > 1)
00051     G4cout << " >>> G4FissionStore::generateConfiguration" << G4endl;
00052   
00053   const G4double small = -30.0;
00054 
00055   G4double totProb = 0.0;
00056   configProbs.resize(size(),0.);
00057 
00058   if (verboseLevel > 3)
00059     G4cout << " amax " << amax << " ic " << size() << G4endl;
00060 
00061   for (size_t i = 0; i < size(); i++) {
00062     G4double ez = configurations[i].ezet;
00063     G4double pr = ez - amax;
00064 
00065     if (pr < small) pr = small;
00066     pr = std::exp(pr);
00067     if (verboseLevel > 2) {
00068       G4cout << configurations[i] << "\n probability " << pr << G4endl; 
00069     }
00070     totProb += pr;
00071     configProbs[i] = totProb;  
00072   };
00073 
00074   G4double st = totProb * rand;
00075 
00076   size_t igen = 0;
00077   while (configProbs[igen] <= st && igen < size()) igen++;
00078 
00079   if (verboseLevel > 3) G4cout << " igen " << igen << G4endl;
00080 
00081   return configurations[igen];
00082 }                   

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