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Forum: Particles
Re: None Read Energy Spectrum from a text file. (Victor Meldrew)
Date: 23 Sep, 2016
From: Youming Yang <Youming Yang>

Hi Victor,

Firstly, the Geant4 General Particle Source (G4GPS) class is quite powerful, and is a much more straightforward way of implementing histograms in energy, position, angle, etc.

You can read up on all the commands available if you search for "gps" in the user manual (book for application dev, starting page 28 of 385). Additionally, examples can be found under: <geant4dir>\examples\extended\eventgenerator\exgps\

As far as your renormalization value, I assume this is so that you can use multiple sources, with different normalized spectra, and of different intensity (and hence scalefactor)?

If this is true, you may also achieve this in G4gps, by changing the intensity of the source when adding multiple ones, through the command

Best, Ming

On Wed, 21 Sep 2016 15:38:10 GMT, Victor Meldrew wrote:

>   Could you point out to any examples where this is done?
>   I am aware that I can set the histogram by using something like
> "/gps/hist/point 1.0023 202.26", but I want to read this from a text
> file.
>   Hopefully my question is clear.
>   My skeleton code is here:
>   Thanks
> Victor.

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