Re: [fluka-discuss]: Gas bremsstrahlung simulation- How to eliminate unwanted contributions?

From: Luigi Salvatore Esposito <luigi.salvatore.esposito_at_cern.ch>
Date: Thu, 13 Aug 2015 15:50:27 +0000

Marília,
it’s not clear to me which particles you eventually want to transport after the dipole.

However, for a selective killing of the particles the usrmed approach seems more adequate.
When a particle enter in a region with the materials that you have specified in the MAT-PROP card with SDUM= USERDIRE
(mandatory in order to activate the call of the usrmed routine), you can set then its weigh (WEE) to zero.
Besides particle position that are passed to usrmed as input parameters, a useful variable to implement the logic might be
LTRACK (available from the common (TRACKR)) that represents the particle generation number, that is equal to 1 for primary particles.

Hope this could help.
Best regards, luigi


On 13 Aug 2015, at 16:45, MARILIA LISBOA DE OLIVEIRA <marilia.lisboa_at_cnpem.br<mailto:marilia.lisboa_at_cnpem.br>> wrote:

Dear Fluka experts,

I am verifying the dose equivalent rates from gas bremsstrahlung (GB) outside an optical hutch (3 GeV electron synchrotron machine). This GB is produced by the interaction of the primary particle with residual gas (H2, CO, CO2 and CH4 molecules) inside a copper chamber at 1E-9 mbar.

I would like to kill the primary electron beam after a 3.2 T dipole and all particles produced after it to avoid their dose contribution. I read the manual and I am not sure about the best manner to do this (using EMF-CUT or the subroutine USRMED or other manner).

Could someone help me in this question please?

Thank you.

With the best regards,

Marília Lisboa Roca Santo



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Received on Thu Aug 13 2015 - 19:10:28 CEST

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