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Forum: Space Applications
Re: Question gps sphere source (Daniel Braun)
Re: Feedback Re: gps sphere source (Giovanni Santin)
Date: 10 Oct, 2008
From: Daniel Braun <Daniel Braun>

Hallo Giovanni, thank you very much for your answer.

I tried everything like you explained it but I think there still must be a fault somewhere in my macro.

To check if the particles are all going inside the sphere I made a Detector (green Sphere in the pictures) which has the size of the spherical source. I gave the particles a very small energy so they should stop immediately if they have contact with the Material of the detector. I suspected to get a lot of very short trajectories. Especially for the case of mintheta = 0 and maxtheta = 0. But instead I get trajectories which I can't explain.

In the case of mintheta = 0 and maxtheta = 0 they seem to come just from the middle and in the case of mintheta = 0 and maxtheta = 90 it looks like they are coming form one hemisphere.

I attached some pictures and my macro.

Pleas tell me where I make a mistake.

Regards

Daniel

/control/verbose 0

/control/saveHistory

/run/verbose 0

/event/verbose 0

/vis/scene/create

/vis/open OGLIX

/vis/viewer/zoom 0.4

/vis/scene/add/trajectories

/vis/modeling/trajectories/create/drawByCharge

/vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true

/vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2

/vis/scene/endOfEventAction accumulate

/vis/viewer/set/viewpointThetaPhi 0 0 deg

/vis/scene/endOfEventAction accumulate 10000000

/gps/particle proton

/gps/pos/centre 0 0 0

/gps/pos/type Surface

/gps/pos/shape Sphere

/gps/pos/radius 116 mm

/gps/pos/rot1 0 0 1

/gps/ene/type Mono

/gps/energy 0.00000570E-02 eV

/gps/ang/type cos

/gps/ang/mintheta 0 deg

/gps/ang/maxtheta 90 deg

# or /gps/ang/maxtheta 0 deg

/run/beamOn 3000

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2008/10/10/03.59-14287-0_0.eps
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2008/10/10/03.59-30858-0_90.epsOn Fri, 10 Oct 2008 09:08:24 GMT, Giovanni Santin wrote:

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1 Feedback: Re: gps sphere source   (Giovanni Santin - 16 Oct, 2008)
2 None: Re: gps sphere source   (Daniel Braun - 30 Oct, 2008)
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