RE: [fluka-discuss]: USRYIELD two-way vs. one-way

From: <me_at_marychin.org>
Date: Mon, 10 Mar 2014 21:32:42 -0700 (PDT)

Brandon,
Both of your input files appear to contain multiple errors, including numerical
formats and the request for zero angular binning from omega zero to omega zero.
What are you trying to score? Have you checked with FLAIR? Did FLUKA actually
run?

> On 09 March 2014 at 22:12 "REDDELL, BRANDON D. (JSC-EV511)"
> <brandon.d.reddell_at_nasa.gov> wrote:
>
>
> My expectation was that switching the upstream and downsteam assignments will
> give forward or backward USRYIELD distributions. I have a simple slab, a
> proton beam normally incident and I am looking at the differential flux of
> neutrons crossing the surface. I have the following USRYIELD CARDS for the
> forward flux of neutrons and the backward flux of neutrons between two
> adjacent bodies. The two files are exactly the same? I haven’t seen this
> before in previous versions of FLUKA, so I am wondering if I am doing
> something wrong. My source is a beam of protons normally incident on a slab
> surface. I must be overlooking something very simple here?
>
>
>
> RPP BLKH -500000.0 500000.0 -500000.0 500000.0 -500000.0 100.0000.0
>
> RPP SPCE -50000.0 50000.0 -50000.0 50000.0 -50000.0 50.000.0
>
> RPP TARG -5000.0 500.0 -5000.0 5000.0 0.0 14.9
>
> XYP P1 12.967766
>
> XYP P2 14.820304
>
> END
>
> BLKH 5 +BLKH -SPCE
>
> SPCE 5 +SPCE -TARG
>
> BOD1 5 +TARG +P1
>
> BOD2 5 +TARG +P2 -P1
>
> BOD3 5 +TARG -P2
>
> END
>
> GEOEND
>
> *
>
> ASSIGNMA BLCKHOLE BLKH
>
> ASSIGNMA VACUUM SPCE
>
> ASSIGNMA ALUMINUM BOD1
>
> ASSIGNMA ALUMINUM BOD2
>
> ASSIGNMA ALUMINUM BOD3
>
> * Forward
>
> USRYIELD 2174 NEUTRON -50.0 BOD1 BOD2 1.0Nu35
>
> USRYIELD 2.5 1.0D-5 50.0 0.5 -0.5 1006&
>
> * Backward
>
> USRYIELD 2174 NEUTRON -60.0 BOD2 BOD1 1.0Nu35
>
> USRYIELD 2.5 1.0D-5 50.0 0.5 -0.5 1006&
>
> *
>
> From: me_at_marychin.org [mailto:me_at_marychin.org]
> Sent: Sunday, March 09, 2014 8:46 PM
> To: fluka-discuss_at_fluka.org; REDDELL, BRANDON D. (JSC-EV511)
> Subject: Re: [fluka-discuss]: USRYIELD two-way vs. one-way
>
>
>
> Hi Brandon,
>
> Swapping the upstream and downstream regions generally would not produce the
> same results. Is there any corresponding symmetry of some sort in your set up?
>
> Cheers,
>
> mary
>
> > >
> > On 08 March 2014 at 05:35 "REDDELL, BRANDON D. (JSC-EV511)"
> > <brandon.d.reddell_at_nasa.gov <mailto:brandon.d.reddell_at_nasa.gov> > wrote:
> >
> > Hello,
> >
> >
> >
> > I recently performed a simulation and used the USRYIELD card to get the
> > double differential spectrum crossing a boundary defined by reg1 and reg2. I
> > swapped the upstream and downstream assignments in WHAT(4) and WHAT(5)
> > expecting different results to get both forward and backward estimates. I
> > got the same results in both cases. Can someone tell me if this is the
> > expected result? In the past, I was under the impression that it would give
> > me forward or backward double differential scoring and not just the total.
> >
> >
> >
> > I am aware that I can use USRBDX to do this same problem.
> >
> >
> >
> > Thanks,
> >
> >
> >
> > Brandon
> >
> > >
>
>
>
Received on Tue Mar 11 2014 - 06:46:25 CET