Re: [fluka-discuss]: do fluka have variance reduction tecnique of forced collision like in mcnp or phits?

From: Stefan E. Mueller <stefan.mueller_at_hzdr.de>
Date: Thu, 21 Jan 2021 14:38:16 +0100 (CET)

Dear FLUKA user,

as far as I know, FLUKA does not implement the "Forced Collision" variance
reduction technique (other users in the mailing list may correct me on
that).

         Stefan

--
Stefan E. Mueller
Department of Information Services and Computing - Computational Science
and Institute of Radiation Physics
Helmholtz-Zentrum Dresden-Rossendorf
Tel: +49 (0351) 260 3847
Stefan.Mueller_at_hzdr.de
http://www.hzdr.de
Vorstand: Prof. Dr. Sebastian M. Schmidt, Dr. Diana Stiller
Vereinsregister: VR 1693 beim Amtsgericht Dresden
On Thu, 7 Jan 2021:
Dear fluka experts:
     do fluka have variance reduction tecnique of forced collision like in 
mcnp or phits?
the tecnique like below:
The forced collisions are used for improving tally statistics or thin 
target analysis by enlarging the collision
probabilities. When specified particle comes into a region defined as the 
forced collision region, the particle is
divided into two particles. One has a weight by (penetration probability) 
× (its weight), this particle pass through
to the next region. The other has a weight of (1 - penetration 
probability) × (its weight), and it is forced to collide
with a target in the region. The collision point is randomly determined 
according to cross sections. Regions and
factors for the forced collisions can be defined in this section. 
Non-defined regions are set factor zero.
if fluka have, how shauld i do?
with best regards!

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Received on Thu Jan 21 2021 - 16:21:55 CET