|Message: Re: define a sphere shell source||Not Logged In (login)|
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On Tue, 19 Feb 2019 05:36:20 GMT, Jincai wrote:
> Hi, I'm trying to define a neutron source which needs to meet the following requirements: > 1.shape: sphere shell volume source,i.e. inter radius 1700cm, outer radius 4100cm. > 2.energy: monoenergy > 3.momentum: inwards & outwards, i.e. neutrons should move in the direction of both towards center and the opposite. (I found an example of a sphere-shell-shape source in the file > <G4sourcedir>/examples/extended/eventgenerator/particleGun > but it seems that all particles are moving outwards.
1- In PrimaryGegeratorAction4, you can choose the range of alpha : lines 59-60
2- if you want only "radial" particles, I would instead replace lines 90-91 : G4double cosAlpha = 1. if (G4UniformRand() > 0.5) cosAlpha = -1. G4double sinAlpha = 0.
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