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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4NeutronHPEnergyDistribution.hh,v 1.11 2007/06/06 12:45:13 ahoward Exp $ |
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28 | // GEANT4 tag $Name: $ |
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29 | // |
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30 | #ifndef G4NeutronHPEnergyDistribution_h |
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31 | #define G4NeutronHPEnergyDistribution_h 1 |
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32 | |
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33 | #include "globals.hh" |
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34 | #include "G4ios.hh" |
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35 | #include <fstream> |
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36 | #include "G4NeutronHPArbitaryTab.hh" |
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37 | #include "G4NeutronHPEvapSpectrum.hh" |
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38 | #include "G4NeutronHPSimpleEvapSpectrum.hh" |
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39 | #include "G4NeutronHPFissionSpectrum.hh" |
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40 | #include "G4NeutronHPWattSpectrum.hh" |
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41 | #include "G4NeutronHPMadlandNixSpectrum.hh" |
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42 | #include "G4VNeutronHPEDis.hh" |
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43 | #include "Randomize.hh" |
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44 | |
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45 | // we will need a List of these .... one per term. |
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46 | |
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47 | class G4NeutronHPEnergyDistribution |
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48 | { |
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49 | public: |
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50 | G4NeutronHPEnergyDistribution() |
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51 | { |
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52 | theEnergyDistribution = 0; |
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53 | theNumberOfPartials = 0; |
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54 | theRepresentationType = 0; |
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55 | } |
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56 | ~G4NeutronHPEnergyDistribution() |
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57 | { |
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58 | if(theEnergyDistribution != 0) |
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59 | { |
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60 | for(G4int i=0; i<theNumberOfPartials; i++) |
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61 | { |
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62 | delete theEnergyDistribution[i]; |
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63 | } |
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64 | delete [] theEnergyDistribution; |
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65 | } |
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66 | } |
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67 | |
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68 | inline void Init(std::ifstream & theData) |
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69 | { |
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70 | G4double dummy; |
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71 | theData >> dummy >> theNumberOfPartials; |
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72 | theEnergyDistribution = new G4VNeutronHPEDis * [theNumberOfPartials]; |
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73 | for(G4int i=0; i<theNumberOfPartials; i++) |
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74 | { |
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75 | theData >> theRepresentationType; |
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76 | switch(theRepresentationType) |
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77 | { |
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78 | case 1: |
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79 | theEnergyDistribution[i] = new G4NeutronHPArbitaryTab; |
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80 | break; |
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81 | case 5: |
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82 | theEnergyDistribution[i] = new G4NeutronHPEvapSpectrum; |
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83 | break; |
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84 | case 7: |
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85 | theEnergyDistribution[i] = new G4NeutronHPFissionSpectrum; |
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86 | break; |
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87 | case 9: |
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88 | theEnergyDistribution[i] = new G4NeutronHPSimpleEvapSpectrum; |
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89 | break; |
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90 | case 11: |
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91 | theEnergyDistribution[i] = new G4NeutronHPWattSpectrum; |
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92 | break; |
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93 | case 12: |
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94 | theEnergyDistribution[i] = new G4NeutronHPMadlandNixSpectrum; |
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95 | break; |
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96 | } |
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97 | theEnergyDistribution[i]->Init(theData); |
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98 | } |
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99 | } |
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100 | |
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101 | inline G4double Sample(G4double anEnergy, G4int & it) |
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102 | { |
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103 | G4double result = 0; |
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104 | it = 0; |
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105 | if (theNumberOfPartials != 0) |
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106 | { |
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107 | G4double sum=0; |
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108 | G4double * running = new G4double[theNumberOfPartials]; |
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109 | running[0] = 0; |
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110 | G4int i; |
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111 | for (i=0; i<theNumberOfPartials; i++) |
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112 | { |
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113 | if (i!=0) running[i]=running[i-1]; |
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114 | running[i]+=theEnergyDistribution[i]->GetFractionalProbability(anEnergy); |
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115 | } |
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116 | sum = running[theNumberOfPartials-1]; |
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117 | G4double random = G4UniformRand(); |
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118 | for(i=0; i<theNumberOfPartials; i++) |
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119 | { |
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120 | it = i; |
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121 | if(running[i]/sum>random) break; |
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122 | } |
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123 | delete [] running; |
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124 | if(it==theNumberOfPartials) it--; |
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125 | result = theEnergyDistribution[it]->Sample(anEnergy); |
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126 | } |
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127 | return result; |
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128 | } |
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129 | |
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130 | private: |
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131 | |
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132 | G4int theNumberOfPartials; |
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133 | G4int theRepresentationType; |
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134 | G4VNeutronHPEDis ** theEnergyDistribution; |
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135 | }; |
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136 | |
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137 | #endif |
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