RE: [fluka-discuss]: Flux/fluence

From: Mihaela Parvu <mihaela.parvu_at_cern.ch>
Date: Mon, 13 Aug 2018 11:37:44 +0000

Dear Andrea,

Thank you so much for your help. Unfortunately, now I get this plot error. It's like I do not have neutrons, but it is impossible. Also, When I try to plot the geometry I get another error:

 plot 'MIN_v2_geometry.dat' ind 0 us 1:2 w l ls 1 notitle
<e< line 0: warning: Skipping data file with no valid points

NEUTRONS USRBDX

Started 2018.08.13 14:19:31
reset
set terminal wxt 0 enhanced raise title 'MIN_try1.flair-0: USR-1D ../MIN v2 31'

set title 'USR-1D /MIN v2 31'
unset grid
set xlabel ''
set xtics
set ylabel ''
set ytics
set logscale x
set logscale y
unset logscale z
unset logscale cb
unset logscale x2
unset logscale y2
set key default
plot '../modified_CERN/MIN_v2_31_tab.lis' ind 0 us 1:3 w steps lw 2 lc rgb 'red' t 'Detector 1','' ind 0 us (sqrt($1*$2)):3:($3*$4/100.) w errorbars lw 2 lc rgb 'red' pt 0 ps 1 notitle
<e< gnuplot> plot '../modified_CERN/MIN_v2_31_tab.lis' ind 0 us 1:3 w steps lw 2 lc rgb 'red' t 'Detector 1','' ind 0 us (sqrt($1*$2)):3:($3*$4/100.) w errorbars lw 2 lc rgb 'red' pt 0 ps 1 notitle

<e< ^

<e< line 0: all points y value undefined!

Gnuplot error

________________________________________
From: Andrea Fontana [andrea.fontana_at_pv.infn.it]
Sent: 13 August 2018 13:46
To: Mihaela Parvu
Cc: fluka-discuss_at_fluka.org
Subject: Re: [fluka-discuss]: Flux/fluence

Dear Mihaela,
   I have run your example and I see that you have forgotten the
 normalization to the area of the first USRBDX card (output 25).

Moreover this normalization should read 360000, while the
normalization of your second USRBDX card should read 360720.36
(and not 360000), to take into account the 6mm thickness of the wall.

Even with this normalization correctly done, you will still
see differences because of the muons interactions in the steel of
the wall and in the argon of the target. If you put both materials
to vacuum, you will get the same fluxes.

In attachment a corrected version of your input (I have added two
USRBIN cards to better visualize your results).

Perhaps this discussion is useful:

http://www.fluka.org/web_archive/earchive/new-fluka-discuss/9211.html

Hope this helps,
Andrea

> Dear Fluka experts,
>
> I am trying to simulate muon induced neutrons. For this I am using my own
> predefined source of muons with flux as a function of energy. When I use
> USRBDX, the fluence I am getting from VOID to wall does not coincide with
> the incident one.
> Can you please tell me help me? I have attached the input files
>


--
========================================================================
Dr. Andrea Fontana                    tel: +39 0382 987991
Istituto Nazionale                    fax: +39 0382 423241
di Fisica Nucleare
Sezione di Pavia                      e-mail: andrea.fontana_at_pv.infn.it
Via Bassi 6                           web   : www.pv.infn.it/~fontana
27100 PAVIA, Italy
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Received on Mon Aug 13 2018 - 15:12:55 CEST

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