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Keywords: GPS user defined energy spectrum
Forum: Particles
Re: Question How to use GPS (General Particle Source) (Jorge Cabello)
Date: 15 Aug, 2006
From: Giovanni Santin <Giovanni Santin>

User Jorge wrote:

>> Hi guys,
>> I am shooting some beta electrons (beta emitter) to a slab of silicon to
>> know the behaviour of a CCD and CMOS sensor. I've been using
>> monoenergetic electrons so far but now I want to simulate a point source
>> of C14. To do that I have to use GPS to generate a user defined energy
>> spectrum (any alternative suggestion?). The problem is that I'm quite
>> confused with the command "/gps/histpoint". I now that the first
>> parameter is the energy (in MeV) and the second is the weight but I
>> don't know how to use this parameter. I am trying to understand this
>> with experiments but the more I do the more I am confused. I've been
>> looking for in internet about this but everything I find are
>> experiments, that don't fit with my situation, and the documentation
>> that is quite poor in this aspect.
>> Can anybody help me? Thanks a lot, Jorge

Dear Jorge

I would suggest to shoot directly C14 ions with the commands

 /gps/ene/type Mono
 /gps/ene/mono 0. MeV

 /gps/particle ion
 /gps/ion 6 14
 /grdm/fBeta 1

 /tracking/verbose 1
 /run/beamOn 1

If you really need to shoot the electrons, please be aware that the GPS interface has slightly changed in the new GPS version. As an example, the histpoint commands has now become /gps/hist/point

The second argument of /gps/hist/point has different meanings depending on the type of distribution you are defining. You can find detailed information specific to GPS on the web site

(this link is accessible from the general Geant4 User Support page)

Best regards,


 Giovanni Santin
 Space Environments and Effects Analysis
 Keplerlaan 1, 2200 AG Noordwijk, Netherlands
 Tel: +31 71 565 6267
 Fax: +31 71 565 4999

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1 None: Re: How to use GPS (General Particle Source)   (Jorge - 04 Sep, 2006)
(_ None: Re: How to use GPS (General Particle Source)   (Jorge - 14 Sep, 2006)
(_ Feedback: Re: How to use GPS (General Particle Source)   (Peter Gumplinger - 14 Sep, 2006)
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