Re: Plotting USRBDX with one angular bin

From: Alberto Fasso' (fasso@SLAC.Stanford.EDU)
Date: Tue Sep 19 2006 - 18:21:58 CEST

  • Next message: Giuseppe Battistoni: "Re: Plotting USRBDX with one angular bin"

    I know for sure for what concerns the *_sum.lis file, but I don't know about
    the *_tab.lis file, which is a recent addition (by Paola, I think).
    Paola, can you answer this question?

    Alberto

    On Tue, 19 Sep 2006, Sebastien WURTH wrote:

    > All right, apparently, it was not very clear for me, although I saw it
    > (the fact that you must not multiply again by 2 pi or 4 pi) by
    > experience on comparing some USRTRACK an "similar" USRBDX results...
    > But then with the same example (one angular bin), in the *_tab.lis file
    > when it says "integrated over solid angle" at the first lign, it refers
    > to the differential Flux as a function of energy in (Part/GeV/cmq/pr) in
    > *_sum.lis file, I do have to multiply by each energy bin value to obtain
    > integrated flux in part/cmq/pr. Am I right this time ?
    >
    > Thank you.
    > Regards.
    > Sebastien.
    >
    > Alberto Fasso' a écrit :
    >
    > >Be careful: the manual says that you must multiply by 2 pi or 4 pi,
    > >but assuming that you do the integration yourself. The usxsuw program
    > >takes already care of that, so you must not do it again
    > >
    > >Alberto
    > >
    > >On Tue, 19 Sep 2006, Sebastien WURTH wrote:
    > >
    > >
    > >
    > >>Hello,
    > >>
    > >>In your example, you cannot have a neutron fluence, you put WHAT(2) =
    > >>7.0 in your first USRBDX card, this would give you photon fluence (maybe
    > >>you choose only the wrong example to illustrate).
    > >>To answer your question (I was asking me the same one once), I quote the
    > >>manual from USRBDX part :
    > >>*********
    > >>Notes
    > >>1. IMPORTANT! The results of a USRBDX boundary crossing estimator are
    > >>always given as double differential
    > >>distributions of fluence (or current) in energy and solid angle, in
    > >>units of cm−2 GeV−1 sr−1 per incident primary,
    > >>even when only 1 interval (bin) has been requested, which is often the
    > >>case for angular distributions.
    > >>Thus, for example, when requesting a fluence or current energy spectrum,
    > >>with no angular distribution, to
    > >>obtain integral binned results (fluence or current in cm−2 per energy
    > >>bin per primary) one must multiply the
    > >>value of each energy bin by the width of the bin (even for logarithmic
    > >>binning), and by 2 pi or 4 pi (depending
    > >>on whether one-way or two-way scoring has been requested).[...]
    > >>*********
    > >>
    > >>Best Regards.
    > >>Sebastien.
    > >>
    > >>
    > >>
    > >>
    > >>Nicole Patricia Lee Pratt-Boyden a écrit :
    > >>
    > >>
    > >>
    > >>>Hello,
    > >>>
    > >>>I'm using a USRBDX card to score neutron fluence (linear angular and
    > >>>energy bins). The programme seems to be running fine, and I'm compiling
    > >>>the data with the usxsuw.f programme.
    > >>>
    > >>>I asked for eight energy bins, and one angular bin.
    > >>>
    > >>>USRBDX 101.0 7.0 -48.0 3.0 4.0 400.0
    > >>>PH-199m
    > >>>USRBDX 6.5E-4 2.5E-4 8.0 0.0 1. &
    > >>>
    > >>>The *_tab file only returns the differential fluence integrated over
    > >>>solid angle; there are no double differential values returned at all,
    > >>>no mention of solid angle boundaries.
    > >>>
    > >>>Assuming this is fine, do I still need to multiply the differential
    > >>>values by 2PI (one-way scoring) in order to get diff. fluence in
    > >>>particles/GeV/cm^2/primary, or do I only do this if I want fluence
    > >>>(/cm^2/pr)?
    > >>>
    > >>>Apologies if this is extremely simple, I was just thrown by the lack of
    > >>>any information for the double differential! Best regards,
    > >>>
    > >>>Nicole Pratt-Boyden.
    > >>>
    > >>>
    > >>>
    > >>>
    > >>
    > >>
    > >>
    > >
    > >
    > >
    >
    >

    -- 
    Alberto Fass
    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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