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Question Particle generation over hemisphere 

Keywords: primary generation, event generation
Forum: Event and Track Management
Date: 28 Apr, 2005
From: Sean Turnbull <Sean Turnbull>

Hello all, I am simulating a simple NaI detector and want to generate a uniform distribution of particles over a hemisphere from a point source to hit the detector. Rather like a shower of particles. This is my PrimaryGenerator class.

  G4int n_particle = 1;
  particleGun = new G4ParticleGun(n_particle);

  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  particleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, -8.81*cm)); //

  delete particleGun;

void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
  //distribution uniform in solid angle - hemispherical

  G4double cosTheta = G4UniformRand() - 1., phi = twopi*G4UniformRand();
  G4double sinTheta = sqrt(1. - cosTheta*cosTheta);
  G4double ux = sinTheta*cos(phi),
           uy = sinTheta*sin(phi),
           uz = cosTheta;


for any more info please let me know....



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1 Feedback: Re: Particle generation over hemisphere   (Giovanni Santin - 28 Apr, 2005)
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