Re: [fluka-discuss]: How to find kinetic energy of particle after degrader?

From: Giuseppe Battistoni <>
Date: Mon, 18 Jan 2016 15:39:05 +0100

Dear Helga
the simplest solution is actually a pre-defined scoring:
you should make use of a USRBDX to score the energy distribution of
protons at the boundary between the degrader and a further
downstream region that you can easily define. One-way current
of fluence scoring.

About of mgdraw:
the us of USDRAW is in any case a wrong choice, since it gives you
access to what occurred in an interaction inside the
degrader region, but the energy loss in the material before exiting
the degrader has not yet been taken into account.
The correct entry point in mgdraw.f would be BXDRAW at the boundary that
is of your interest, as the one I mentioned before, but this would
eventually give the same results of USRBDX.

        Giuseppe Battistoni

On 18/01/16 15:06, Helga Holmestad wrote:
> Dear FLUKA experts
> I have a simple setup in my simulation, a beam of 5.3 MeV protons is in
> vacuum and is sent trough a 50 um aliminium degrader. I need to know the
> energy of the particles after it has passed the degrader. I don't see
> any predefined scoring options for this, or is there? Or do I need to
> use the collision tape?
> I have attempted to write my own mgdraw and using the USDRAW routine for
> this. The variable tki(i) should give the energy of the particle. But
> the USDRAW function is never called in my simulation, because it looks
> like energy loss is not considered as an interaction.

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Received on Mon Jan 18 2016 - 16:53:22 CET

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