Re: degree of 'analogueness'

From: Francesco Cerutti <>
Date: Sat, 5 Sep 2009 23:22:28 +0200

Dear Mary,

1. the degree of 'analogueness' set through the GLOBAL card affects only
the treatment of some low energy neutron processes. Then, it has has no
impact - e.g. - on transport cutoffs.
3. the warning you get when you ask for a fully analogue run, is due to a
conflict with some input biasing setting. E.g., with a ... missing
DEFAULTS card, implying the adoption of NEW-DEFA and so of non analogue
absorption for thermal neutrons
2. I do not see a significant CPU impact playing with GLOBAL for
2.5GeV protons on lead and bismuth (I didn't have the specs of your liquid
target). In case you confirm your endless finding, please let us get your



Francesco Cerutti
CH-1211 Geneva 23
tel. ++41 22 7678962
fax ++41 22 7668854

On Thu, 3 Sep 2009, Mary Chin wrote:

> Dear FLUKA friends,
> I am trying to see the change in the degree of 'analogueness' by setting
> GLOBAL WHAT(2) to -1, 0 and 3.
> 1. I did an xxdiff/mgdiff of the *.out; was hoping to find some
> difference in transport settings (eg this cutoff instead of that, or
> this model instead of that) during the initialization (before the NEXT
> SEEDS), but couldn't find any. How do I find out what differences in
> transport were exercised?
> 2. The simulation with GLOBAL WHAT(2) = 3 seems to be running forever
> and it still is.... I thought this was supposed to be the quickest of
> the three?
> 3. In the simulation with GLOBAL WHAT(2) = -1 I get the warning, =
> "Analog
> flag forced by the user. Do you know what are you doing?" Well, I think
> and hope so, could someone kindly check whether I do... I mean to be 'as
> analog as possible' with the understanding/assumption that
> a. there is no physics caveat behind 'as analog as possible'
> b. the only danger/lost is in wasting computation time.
> My set up is like this: 2.5 GeV protons hitting an effectively infinite
> cylinder of liquid lead bismuth, plus an assortment of USRBINs.
> Help will be greatly appreciated. Many thanks!
> :) mary
Received on Sun Sep 06 2009 - 00:04:01 CEST

This archive was generated by hypermail 2.2.0 : Sun Sep 06 2009 - 00:04:01 CEST