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Question hemisphere generation using General Particle Source Module 

Keywords: hemisphere in gps
Forum: Space Applications
Date: 28 Aug, 2006
From: Manju Sudhakar <Manju Sudhakar>

Hi,

I would like to know how to generate a hemisphere using General Particle Source Module. It is easy to do so in the G4UserPrimaryGeneratorAction.cc, but I want to use gps because my energy is in the form of a user defined histogram. I checked the queries posted in this forum regarding generation of a hemisphere using gps, and I found out that "biasing" should be used and the extended example "exgps" has a macro "test32.g4mac, which gives the methodology to do so. But, I donot know how the biasing works and the gps manual doesnot give any details. Could someone please help me out in this.. It is really important, as I want to model the space-craft background due to photons generated on the inner surface of a hemisphere that is placed behind the space-craft, ie, the photons are incident from the hemisphere inner surface and impinging on the back of the detector.

Please could someone tell me how to go about this ??

Thanks, Manju Sudhakar.

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