RE: another low energy neutron xsec case

From: Reddell, Brandon D (brandon.d.reddell@boeing.com)
Date: Mon Sep 12 2005 - 17:30:58 CEST

  • Next message: Giuseppe Battistoni: "Re: some general questions about lattice routine"

    Ok...

    Since I posted the question, I got the program to run with the LOW-MAT lines commented out. I was under the impression that they were needed (the FLUKA2003 manual implies that the user has to re-define the air and water) to load the low-energy neutron information for the individual compounds that I created.

    I guess I didn't understand fully.

    Thanks for the clarification.

    Brandon

     

    -----Original Message-----
    From: Alberto Fasso' [mailto:fasso@slac.stanford.edu]
    Sent: Monday, September 12, 2005 9:58 AM
    To: Reddell, Brandon D
    Cc: fluka-discuss@fisica.unimi.it
    Subject: Re: another low energy neutron xsec case

    Oxygen's identifiers are 8 +16 293, not 8.0 -2.0 293.

    There may be other erros of the same type, I haven't checked.
    But why do you use LOW-MAT? The default materials are those you want, and using LOW-MAT when it is not necessary is a frequent source of mistakes of this kind.
    There is a double warning in the manual, but users seem to love that command. The purpose of LOW-MAT is to override the defaults in the
    (rare) cases when they are not acceptable.

    Alberto

    On Sun, 11 Sep 2005, Reddell, Brandon D wrote:

    >
    > Dear FLUKA users,
    >
    > I am getting the following familiar error message that has been posted before:
    >
    > **** Low energy neutron xsec not found for some media 3 5 ****
    >
    > However, I can not determine what the problem is. Below are my material and assignment statements. Could somebody tell me what I am doing wrong?
    >
    > Sincerely,
    >
    > Brandon Reddell
    >
    > *23456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
    > *MATERIAL 13.0 27.000 2.70 10.0 ALUMINUM
    > *LOW-MAT 13.0 13.0 -2.0 293.0
    > *MATERIAL 14.0 28.100 2.329 13.0 SILICON
    > *
    > *23456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
    > MATERIAL 7.0 14.067 0.001251 7.0 NITROGEN
    > LOW-MAT 7.0 7.0 -2.0 293. NITROGEN
    > MATERIAL 8.0 15.999 0.001429 8.0 OXYGEN
    > LOW-MAT 8.0 8.0 -2.0 293. OXYGEN
    > MATERIAL 1.0 1.0079 8.988E-5 3.0 HYDROGEN
    > LOW-MAT 3.0 3.0 -2.0 293.0 HYDROGEN
    > * Argon material n. 18, normal temperature, overrides default mat. 18
    > MATERIAL 18.0 39.948 1.400 18.0 ARGON
    > LOW-MAT 18.0 18.0 -2.0 293.0 ARGON
    > * Air (mat. 24): 3 components, N (mat. 7), O (mat. 8), gaseous Ar (mat. 18)
    > MATERIAL 0.001225 26.0 AIR
    > COMPOUND -.9256E-03 7.0 -.2837E-03 8.0 -.01572E-3 18.0 AIR
    > * Water (mat. 20): H (material 3) and O (material 8)
    > MATERIAL 1.00 27.0 WATER
    > COMPOUND 2.0 3.0 1.0 8.0 WATER
    > *23456789 123456789 123456789 123456789 123456789 123456789 123456789
    > 123456789
    > * Aluminum
    > ASSIGNMAT 10.0 3.0
    > * External Black Hole
    > ASSIGNMAT 1.0 1.0
    > * Vacuum
    > ASSIGNMAT 2.0 2.0
    > * Air
    > ASSIGNMAT 26.0 4.0
    > * Water
    > ASSIGNMAT 27.0 5.0
    > ASSIGNMAT 27.0 6.0
    > LOW-NEUT 0.0
    > EMF EMF-OFF
    > *23456789 123456789 123456789 123456789 123456789 123456789 123456789
    > 123456789
    >
    >
    >

    --
    Alberto FassÚ
    SLAC-RP, MS 48, 2575 Sand Hill Road, Menlo Park CA 94025
    Phone: (1 650) 926 4762   Fax: (1 650) 926 3569
    fasso@slac.stanford.edu
    

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