[fluka-discuss]: RE: Understanding USRBDX output files

From: Eleftherios Skordis <eleftherios.skordis_at_cern.ch>
Date: Tue, 7 Jul 2015 08:30:06 +0000

Hi both,

It is most likely that you have no RANDOMIZ card active in your input.
For Ana, looking at your input file, you have comment the card out and thus getting only the same history over and over again.

Kind regards

Lefteris


-----------------------

Eleftherios Skordis
Dep. EN/STI, CERN
CH-1211 GENEVA 23
SWITZERLAND

OFFICE: +41-22-7679541<tel:%2B41-22-7675461>
________________________________
From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Joachim Vollaire [joachim.vollaire_at_cern.ch]
Sent: 07 July 2015 09:37
To: Zafar Yasin; Ferreira De Almeida Lourenco, Ana; fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: RE: Understanding USRBDX output files

Hi
The most likely cause is that you are not differentiating your runs and starting with the same random seeds. You are thus computing the error based on the same exact histories and averaged means so the variance is zero in that case. You can check it is the case by converting two of your data files to ascii and check if they are identical.

As instructed in the manual you should have a minimum of five independent runs (different random seeds) to compute representative errors
Hoping this help
Greetings
Joachim

From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Zafar Yasin
Sent: 06 July 2015 22:54
To: Ferreira De Almeida Lourenco, Ana; fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: RE: Understanding USRBDX output files

Dear Fluka users and Ana,

I am also facing the same problem but with USRTRACK card, I am not using the URBDX, while I do activation
analysis for prompt beam it is ok.

Best regards,
Zafar


________________________________
From: owner-fluka-discuss_at_mi.infn.it<mailto:owner-fluka-discuss_at_mi.infn.it> [owner-fluka-discuss_at_mi.infn.it] on behalf of Ferreira De Almeida Lourenco, Ana [am.lourenco_at_ucl.ac.uk]
Sent: 06 July 2015 11:51
To: fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>
Subject: [fluka-discuss]: Understanding USRBDX output files


Dear FLUKA experts,

I am simulating a proton beam in a target cylinder and scoring fluence differential in energy and angle in a ring detector using a USRBDX card.

For a non zero fluence I'm getting a error of zero. Why is the error zero? Example of sum.lis file:
...
     Tot. resp. (Part/cmq/pr) 0.8798609 +/- 0.000000 %
     ( --> (Part/pr) 0.8798609 +/- 0.000000 % )
...

Also, in the sum.lis files the angular distribution and respective fluence are given in units of steradians and degrees. How are these two quantities related?

Please find attached my input file.

Many thanks,
Ana


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Received on Tue Jul 07 2015 - 12:04:30 CEST

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