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Forum: Space Applications
Date: 30 Aug, 2005
From: Hugh Evans <Hugh Evans>

Hello Manju,

The energy units in the GPS histogram that you're building are in MeV. The
absolute values of the differential "flux" are not important as they are all
normalised to a probability distribution [0..1], therefore the relative
difference between bins in the histogram are of the greatest importance, not
the absolute value.

While cosmic ray fluxes aren't yet available, the trapped proton, trapped
electron and solar proton flux/fluence spectra from SPENVIS
( can be converted to GPS macros via its
Mulassis application.  By playing with this, you can easily determine how the
environmental spectra are converted to the GPS macro commands.

Alternatively, I can also send you an Excel spreadsheet within which the
CREME-86 spectra are implemented and the GPS macros are formed.


H. Evans
Postbus 299
2200 AG Noordwijk
The Netherlands

Phone:+31 (0)71 565-5109
Fax:     +31 (0)71 565-4999

|         |           Manju Sudhakar  |
|         |           <manjus@isac.ern|
|         | >          |
|         |                           |
|         |           30/08/2005 09:25|
|         |                           |
  |                                                                                                                          |
  |        To:                                                                         |
  |        cc:                                                                                                               |
  |        Subject: Doubt regarding General Particle Source Module                                                           |

*** Discussion title: Space Applications
Email replies to must include:
  In-Reply-To: <"/space_app/3">
  Subject: ...change this to be about your reply.

Dear GEANT users ,

I have a doubt regarding one of the commands in General Particle Source

I have constructed a detector system mounted on a space platform, and I
wish to irradiate it with cosmic-ray protons, at 1AU.I have the spectrum
of the protons with me and I have to enter the energy and flux as a
user-defined arbitrary point-wise function of the form, /gps/ene/type
Arb /gps/hist/type arb /gps/hist/point ...(energy) ... (flux) .... ....
.... .... /gps/hist/inter Lin /run/beamOn 100000

        This is fine, but my doubts are as follows ,
1) What is the default value of the energy points ? Is it MeV ?
2) What is the default value of the differential flux to be entered as in the

   second column ?

Could you please answer my doubts. Regards, Manju Sudhakar.

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