1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // $Id: MedicalBeam.cc,v 1.1 2007/11/16 14:29:33 kmura Exp $ |
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27 | // $Name: $ |
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28 | // ==================================================================== |
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29 | // MedicalBeam.cc |
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30 | // |
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31 | // 2005 Q |
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32 | // ==================================================================== |
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33 | #include "MedicalBeam.hh" |
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34 | #include "Randomize.hh" |
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35 | #include "G4Event.hh" |
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36 | #include "G4ParticleTable.hh" |
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37 | #include "G4PrimaryVertex.hh" |
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38 | |
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39 | using namespace CLHEP; |
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40 | |
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41 | #include <cmath> |
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42 | |
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43 | // ==================================================================== |
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44 | // |
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45 | // class description |
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46 | // |
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47 | // ==================================================================== |
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48 | |
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49 | /////////////////////////////////// |
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50 | MedicalBeam::MedicalBeam() |
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51 | : particle(0), |
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52 | kineticE(1.*MeV), |
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53 | sourcePosition(G4ThreeVector()), |
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54 | SSD(1.*m), |
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55 | fieldShape(MedicalBeam::SQUARE), |
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56 | fieldR(10.*cm) |
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57 | /////////////////////////////////// |
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58 | { |
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59 | |
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60 | G4ParticleTable* particleTable= G4ParticleTable::GetParticleTable(); |
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61 | particle= particleTable-> FindParticle("proton"); |
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62 | |
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63 | kineticE= 200.*MeV; |
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64 | sourcePosition= G4ThreeVector(0.,0.,-125.*cm); |
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65 | SSD= 100.*cm; |
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66 | fieldXY[0]= fieldXY[1]= 5.*cm; |
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67 | } |
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68 | |
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69 | |
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70 | /////////////////////////// |
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71 | MedicalBeam::~MedicalBeam() |
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72 | /////////////////////////// |
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73 | { |
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74 | } |
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75 | |
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76 | |
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77 | //////////////////////////////////////////////////////// |
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78 | G4ThreeVector MedicalBeam::GenerateBeamDirection() const |
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79 | //////////////////////////////////////////////////////// |
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80 | { |
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81 | // uniform distribution in a limitted solid angle |
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82 | G4double dr; |
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83 | if(fieldShape == MedicalBeam::SQUARE) { |
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84 | dr= std::sqrt(sqr(fieldXY[0]/2.)+sqr(fieldXY[1]/2.)); |
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85 | } else { |
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86 | dr= fieldR; |
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87 | } |
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88 | |
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89 | G4double sin0= dr/SSD; |
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90 | G4double cos0= std::sqrt(1.-sqr(sin0)); |
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91 | |
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92 | G4double dcos=0.; |
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93 | G4double dsin, dphi, z; |
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94 | |
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95 | G4double x= DBL_MAX; |
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96 | G4double y= DBL_MAX; |
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97 | |
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98 | G4double xmax, ymax; |
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99 | if(fieldShape == MedicalBeam::SQUARE) { |
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100 | xmax= fieldXY[0]/2./SSD; |
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101 | ymax= fieldXY[1]/2./SSD; |
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102 | } else { |
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103 | xmax= ymax= DBL_MAX-1.; |
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104 | } |
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105 | |
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106 | while(! (std::abs(x)< xmax && std::abs(y)< ymax) ) { |
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107 | dcos= RandFlat::shoot(cos0, 1.); |
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108 | dsin= std::sqrt(1.-sqr(dcos)); |
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109 | dphi= RandFlat::shoot(0., twopi); |
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110 | |
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111 | x= std::cos(dphi)*dsin*dcos; |
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112 | y= std::sin(dphi)*dsin*dcos; |
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113 | } |
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114 | z= dcos; |
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115 | |
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116 | return G4ThreeVector(x,y,z); |
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117 | } |
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118 | |
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119 | |
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120 | ///////////////////////////////////////////////////// |
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121 | void MedicalBeam::GeneratePrimaries(G4Event* anEvent) |
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122 | ///////////////////////////////////////////////////// |
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123 | { |
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124 | if(particle==0) return; |
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125 | |
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126 | // create a new vertex |
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127 | G4PrimaryVertex* vertex= new G4PrimaryVertex(sourcePosition, 0.*ns); |
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128 | |
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129 | // momentum |
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130 | G4double mass= particle-> GetPDGMass(); |
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131 | G4double p= std::sqrt(sqr(mass+kineticE)-sqr(mass)); |
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132 | G4ThreeVector pmon= p*GenerateBeamDirection(); |
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133 | G4PrimaryParticle* primary= new G4PrimaryParticle(particle, |
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134 | pmon.x(), |
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135 | pmon.y(), |
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136 | pmon.z()); |
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137 | // set primary to vertex |
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138 | vertex-> SetPrimary(primary); |
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139 | |
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140 | // set vertex to event |
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141 | anEvent-> AddPrimaryVertex(vertex); |
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142 | } |
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143 | |
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