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Question How to use gps confine physical volume? 

Keywords: GPS,confine,volume
Forum: Particles
Date: 07 Mar, 2008
From: Anil <Anil>

Hello,

Iam new to GPS usage. Iam interested to confine the gammas from a point isotropic source to a physical volume of a pentagon. The source is 140mm away from the front surface pentagon. As mentioned in GPS manual, Iam using "gps/pos/confine crysphy" where crysphy is name of physical volume. But Iam getting following message and in the output file the particles are not confined to the physical volume.

************************************* LoopCount = 100000 Either the source distribution >> confinement or any confining volume may not overlap with the source distribution or any confining volumes may not exist If you have set confine then this will be ignored for this event. ************************************* Following commands are being used.

/gps/particle gamma /gps/pos/type Point /gps/pos/centre 0. 0. 140. mm /gps/pos/confine crysphy /gps/ang/type iso /gps/energy 1000. keV /gps/number 100 /vis/open HepRepFile /vis/drawVolume /vis/scene/add/trajectories /vis/scene/add/hits /run/beamOn 1

May I know where Iam wrong? Thanks in advance!!

Anil

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