[Gate-users] cannot get gaussian energy distribution

[Tho Nguyentran]

If you want to use gps method, you should follow this guide

http://hurel.hanyang.ac.kr/Geant4/Geant4_GPS/reat.space.qinetiq.com/gps/examples/ex31.html

# the beam energy is in gaussian profile centered at 400 MeV
/gps/ene/type Gauss
/gps/ene/mono 400 MeV
/gps/ene/sigma 50. MeV


Nguyễn Trần Thọ 

www.pnt.edu.vn


From: Andreas Tefre Samnøy
Sent: Thursday, November 8, 2018 10:38 PM
To: gate-users at lists.opengatecollaboration.org
Subject: [Gate-users] cannot get gaussian energy distribution

Hi everyone

I am trying to make a simple proton beam where the energy distribution is Gaussian. 
The mean energy should be 13 MeV and the standard deviation should be 1 MeV. When I run the code under, and shoot it directly into a senstive volume, all the recorded hits are 13 MeV. So i conclude that the beam is actually mono energetic.
Can anybody tell me what is wrong in my code?

/gate/source/addSource                      beam     gps
/gate/source/beam/gps/particle          proton
/gate/source/beam/gps/energytype   Gauss
/gate/source/beam/gps/energy           13 MeV
/gate/source/beam/gps/sigmae          1 MeV        

/gate/source/beam/gps/type    Beam
/gate/source/beam/gps/shape    Circle
/gate/source/beam/gps/centre    0 0 900 mm
/gate/source/beam/gps/radius    1 mm

/gate/source/beam/gps/angtype iso 
/gate/source/beam/gps/mintheta 0 deg 
/gate/source/beam/gps/maxtheta 0 deg
/gate/source/beam/gps/minphi 0 deg 
/gate/source/beam/gps/maxphi 360 deg  


Best Regards
Andreas Tefre Samnøy

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