| 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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