[807] | 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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