|Message: Re: TestEm4 detector orientation query?||Not Logged In (login)|
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User Jason wrote:
>> Thanks alot. I got three another minor questions. >> >> From PrimaryGeneratorAction.cc in TestEm4 >> >> particleGun->SetParticleMomentumDirection(G4ThreeVector(1.,0.,0.)) >> >> correct me if I'm wrong, why is the momentum is set along x-direction.
Only for illustration ! It could be suppressed, since it is overwritted in GeneratePrimary() >> >> (2) if I want to stimulate gamma rays emitted by a recoil from the >> z-direction into a cylinder with a hole (rmin is none zero), I should >> set the SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.)) right?
Right. But do not forget to place your holed cylinder within a mother, (world in vacuum ?) so that the central part of the geometry is defined. >> >> (thetha,phi) are of spherical system right?
yes, it is spherical system.
>> >> > Your are ok, except that dz=5cm is the half length of the cylinder. >> >> > In generatePrimary, the photon is shooted at position (0,0,0), >> > randomly in (tetha,phi). >> >> > Michel >>
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