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Forum: Event and Track Management
Re: Question define a sphere shell source (Jincai)
Date: Feb 20, 08:38
From: michel maire <michel maire>

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.
> 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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1 Question: Re: define a sphere shell source   (Jincai - Feb 21, 00:19)
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