Re: Is it possible to discard beam particles past a certain region?

Dear Mina,

yes, it is possible to stop the electrons (but all electrons, you cannot
discriminate between primaries and secondaries) when they enter a given region.
Set the electron transport cutoff very high in that region: higher than the
beam energy. Use for this purpose the EMFCUT command with SDUM blank, and set
WHAT(1) higher than the BEAM energy. If necessary, split one of the regions into
two parts, if you want to stop the electrons only in one of them.

Using the same command, make instead WHAT(2) about 6 MeV in all 238U regions:
you don't want to stop the photons, but neither you want to track photons which
are below the threshold for nuclear interactions (6.2 MeV for 238U).

Regards,

Alberto

On Tue, 23 Aug 2011, Mina Nozar wrote:

> Hi everyone,
>
> I am working on a setup, producing RIB out of photo-fissions in a Uranium Carbide.
>
> primary beam: electrons
> converter: to produce photons
> target: depleted Uranium Carbide
>
> In order to optimize the length of the converter, I look at number of fissions in the
> target as a function of the converter thickness (several runs with different converter
> thickness).
>
> My question is: is it possible to discard (stop) the primary beam particles
> (electrons) past the converter, in order to speed up the processing? I looked at the
> DISCARD card but this card doesn't allow for setting transport thresholds in a
> given regions or a set of regions.
>
> Thank you,
> Mina
Received on Wed Aug 24 2011 - 17:52:34 CEST