[Gate-users] Can't run with 100 million particles

[Grevillot Loic]

Dear Soman,

You said you need to run 100 million primaries and artifacts appear after 10 million.
My suggestion is therefore to run 10 simulations of 10 million particles (fully equivalent to a single simu of 100 million). You just have to make sure the seeds are different for every simulation, which can be easily achieved using the following command:
/gate/random/setEngineSeed auto

Best,
Loïc

From: S. Saghamanesh [mailto:s.saghamanesh at yahoo.com]
Sent: Freitag, 3. Oktober 2014 07:30
To: Grevillot Loic
Subject: Re: [Gate-users] Can't run with 100 million particles

Hi,

Thanks a lot for your note. I use of splitting 1000 for my emitted photons but I still have unacceptable uncertainties, so I have to run with 100 million particles. Do you tell me if I run 10 simulations with 10 million particles, it would lessen the uncertainty? I guess it wouldn't, because I have uncertain results with a single simulation of 10 million particles.

Thanks in advance for your help
- Soman


On Wednesday, October 1, 2014 3:41 PM, Grevillot Loic <loic.grevillot at medaustron.at<mailto:loic.grevillot at medaustron.at>> wrote:

Dear Soman,

We noticed a similar simulation “artifact” when a too high number of particles was used. We also noticed that the effect is dependent on the particle type and simulation parameters (cut, step size).
We will try correcting the bug for the next release. In the meantime I advise you to run 10 simulations of 10 million particles.

Sincerely,

Loïc



From: gate-users-bounces at lists.opengatecollaboration.org<mailto:gate-users-bounces at lists.opengatecollaboration.org> [mailto:gate-users-bounces at lists.opengatecollaboration.org] On Behalf Of S. Saghamanesh
Sent: Mittwoch, 1. Oktober 2014 09:29
To: gate-users at lists.opengatecollaboration.org<mailto:gate-users at lists.opengatecollaboration.org>
Subject: [Gate-users] Can't run with 100 million particles

Hi,

Is there any limitation on the number of primary particles generated in Gate7.0 ? It seems running code with more than 10 million particles leads to false results. I need to run my code with 100 millions particles, but after checking (with a very simple example), I noticed that no more than 20 million particles would be generated.

Thanks for your comments.
- Soman
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