RE: energy deposition in thin beam windows

From: Alberto Fasso' <fasso_at_SLAC.Stanford.EDU>
Date: Thu, 22 Apr 2010 00:26:52 -0700 (PDT)

Dear Tristan,

> I have seen a paper where for a thin target the energy deposition is not
> just defined by dE/dx. They claim that quite a lot of the energy
> deposited in the thin target leaves in the form of electrons with their
> own kinetic energy. The energy carried by the electrons which leave the
> target reduces the heating of the target with respect to the dE/dx
> calculation. Is FLUKA accounting for these electrons that are able to
> leave a thin target?

Of course it does! Only, you must be careful to set correctly the
threshold for delta ray production (see command DELTARAY).
Electrons with energies lower than that threshold are not followed by the code,
and their energy is deposited at the production point as part of the dE/dx. But
above the threshold electrons are tracked, and can escape from the target.
You must also make sure that the DEFAULTS you use allow the transport of
electrons and photons (the common default NEW-DEFA does) and set wisely the
cutoffs for electron/photon transport and production.

Alberto
Received on Thu Apr 22 2010 - 10:04:52 CEST

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