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TrackID changes [message #20789] Wed, 29 March 2017 08:16 Go to next message
lanyizsombor is currently offline  lanyizsombor
Messages: 6
Registered: March 2017
Location: Budapest, Hungary
occasional visitor
From: *catv.broadband.hu
Hi all,

I would have a short question. I would like to track every neutron's way in a simulation to test my own code for neutron cross-talk and for this, I thought that I get the interaction coordinates with stepping through the points using GetTrackID(), but I'm not sure whether it works well. So, the main question is that the TrackID changes only if a neutron stops (energy below threshold) and give it's energy for a proton for example; or it could change otherwise too? Hope I asked the question more or less clear.

Best regards,
Zsombor Lányi
Re: TrackID changes [message #20800 is a reply to message #20789] Wed, 05 April 2017 09:34 Go to previous message
Jan Mayer is currently offline  Jan Mayer
Messages: 20
Registered: August 2015
occasional visitor
From: *dyn.hrz.tu-darmstadt.de
Hi Zsombor,

the TrackIDs can be a bit fiddly, especially while accessing them during the simulation, but should work in principle. The track ID can also "change" on any interaction - that means you technically have a new track. You can have a look at that afterwards by using the MotherID. This is -1 for primary particles, so if you shoot in two Neutron you should have two tracks with motherID -1 and pid 2112 (see http://pdg.lbl.gov/2010/reviews/rpp2010-rev-monte-carlo-numbering.pdf).
run->SetStoreTraj(kTRUE); probably needs to be set for this at well (4th parameter in r3ball.C).

Best,
Jan
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