| 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 | // ------------------------------------------------------------------- |
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| 27 | // $Id: MicrobeamPrimaryGeneratorAction.cc,v 1.7 2007/08/27 15:51:54 gcosmo Exp $ |
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| 28 | // ------------------------------------------------------------------- |
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| 29 | |
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| 30 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 31 | |
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| 32 | #include "G4Event.hh" |
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| 33 | #include "G4ParticleTable.hh" |
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| 34 | #include "Randomize.hh" |
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| 35 | |
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| 36 | #include "MicrobeamPrimaryGeneratorAction.hh" |
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| 37 | #include "MicrobeamDetectorConstruction.hh" |
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| 38 | |
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| 39 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 40 | |
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| 41 | MicrobeamPrimaryGeneratorAction::MicrobeamPrimaryGeneratorAction(MicrobeamDetectorConstruction* DC) |
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| 42 | :Detector(DC) |
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| 43 | { |
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| 44 | particleGun = new G4ParticleGun(1); |
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| 45 | } |
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| 46 | |
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| 47 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 48 | |
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| 49 | MicrobeamPrimaryGeneratorAction::~MicrobeamPrimaryGeneratorAction() |
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| 50 | { |
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| 51 | delete particleGun; |
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| 52 | } |
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| 53 | |
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| 54 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 55 | |
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| 56 | void MicrobeamPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent) |
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| 57 | { |
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| 58 | G4int numEvent; |
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| 59 | numEvent=anEvent->GetEventID()+1; |
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| 60 | G4double x0,y0,z0,theta,phi,xMom0,yMom0,zMom0,e0; |
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| 61 | |
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| 62 | // INITIAL BEAM POSITION |
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| 63 | |
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| 64 | z0=-10000*mm; |
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| 65 | x0=10*mm; |
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| 66 | y0=10*mm; |
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| 67 | |
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| 68 | G4double sizeMax = 0.5*micrometer; // INITIAL BEAM POSITION UNIFORMLY SPREAD ON A DISK |
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| 69 | while (! (std::sqrt(x0*x0+y0*y0)<= sizeMax) ) |
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| 70 | { |
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| 71 | x0 = CLHEP::RandFlat::shoot(-sizeMax,sizeMax); |
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| 72 | y0 = CLHEP::RandFlat::shoot(-sizeMax,sizeMax); |
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| 73 | } |
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| 74 | |
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| 75 | // INITIAL BEAM ENERGY |
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| 76 | |
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| 77 | e0= G4RandGauss::shoot(3*MeV,5.0955e-5*MeV); // AIFIRA ENERGY RESOLUTION |
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| 78 | |
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| 79 | // INITIAL BEAM DIVERGENCE |
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| 80 | |
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| 81 | do { |
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| 82 | theta=std::acos(1-G4UniformRand()*(1.0-std::cos(1.1e-6)))*rad; |
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| 83 | } |
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| 84 | while(theta>1.1e-6*rad); |
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| 85 | |
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| 86 | phi=CLHEP::twopi*G4UniformRand()*rad; |
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| 87 | |
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| 88 | xMom0=std::sin(theta)*std::cos(phi); |
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| 89 | yMom0=std::sin(theta)*std::sin(phi); |
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| 90 | zMom0=std::cos(theta); |
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| 91 | |
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| 92 | // VERBOSE |
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| 93 | |
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| 94 | G4cout |
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| 95 | << "-> Event # " << numEvent |
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| 96 | << " generated " |
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| 97 | << G4endl; |
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| 98 | |
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| 99 | /* |
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| 100 | G4cout |
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| 101 | << "-> Event # " << numEvent |
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| 102 | << " : THETA from Z axis (mrad) = " << theta*1000 |
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| 103 | << " -- PHI (deg) = " << phi*180/CLHEP::pi |
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| 104 | << " -- x0 (um) = " << x0/micrometer |
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| 105 | << " -- y0 (um) = " << y0/micrometer |
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| 106 | << " -- z0 (m) = " << z0/m |
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| 107 | << " -- e0 (MeV) = " << e0/MeV |
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| 108 | << G4endl; |
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| 109 | */ |
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| 110 | |
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| 111 | particleGun->SetParticleEnergy(e0); |
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| 112 | |
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| 113 | particleGun->SetParticleMomentumDirection(G4ThreeVector(xMom0,yMom0,zMom0)); |
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| 114 | |
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| 115 | particleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0)); |
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| 116 | |
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| 117 | G4ParticleDefinition* particle= |
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| 118 | G4ParticleTable::GetParticleTable()->FindParticle("alpha"); |
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| 119 | |
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| 120 | particleGun->SetParticleDefinition(particle); |
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| 121 | |
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| 122 | particleGun->GeneratePrimaryVertex(anEvent); |
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| 123 | |
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| 124 | } |
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| 125 | |
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| 126 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 127 | |
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| 128 | |
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