|Message: Re: Energy distribution of source as histogram (GPS)||Not Logged In (login)|
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On Thu, 25 Feb 2010 03:52:51 GMT, Suhaili Zakaria wrote:
> Hello > > I have referred to http://reat.space.qinetiq.com/gps/ and examples in > /extended/eventgenerator/exgps/, but I still have questions and > uncertainties on how to use/define energy distribution as histogram > using GPS. > > 1. I am interested with two of the options that can be used to defined > energy distribution, i.e. energy (/gsp/ene/type User ), and arbitrary > point-wise spectrum (/gps/ene/type Arb). However, I am not sure what is > the difference between this two options, and in what conditions they are > best used. Can someone please explain it?
User: user defined histogram, i.e. step function like spectrum Arb: point-wise spectrum
> > 2. To choose a histogram, the command /gps/hist/type is used. In case of > energy it should be /gps/hist/type energy and /gps/hist/type arb for > arbitrary point-wise. > > I suppose you use /gsp/ene/type User with /gps/hist/type energy; and > (/gps/ene/type Arb) with /gps/hist/type arb. Am I correct?
> > 3. Next, /gps/hist/point <X> <Y> command is used to load the histogram, > where <X> is the energy in MeV and Y is the weight (or area) of the bin.
Correct for the "energy" case. <X> is the lower-edge of the the bin, <Y> is the area of the bin. Please follow test18.g4mac in http://reat.space.qinetiq.com/gps/examples/examples.htm
> How do I determine the weight in this case? > > Is <Y> the number of particles per energy, but that doesn�t seem right. >
In this case you should use the "Arb and "arb" combination, i.e. point-wise distribution. Please follow test19.g4mac in http://reat.space.qinetiq.com/gps/examples/examples.htm
> I really appreciate and looking forward to any insights/answers/comments > on this matter. Many, many thanks >
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