RE: [fluka-discuss]: Problems with Energy Binning Control and Discontinuity Across High/Low Neutron Energy Boundary

From: Anton Lechner <Anton.Lechner_at_cern.ch>
Date: Fri, 3 Feb 2017 07:01:20 +0000

Dear Benjamin,

I suppose you produced the output with another input file than the one attached? Could you be so kind and send me the input file which contains the scorings you attached to the Email.

Thanks!
Anton


________________________________
From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Benjamin Smithers [brsmithe_at_ucsc.edu]
Sent: 03 February 2017 01:25
To: fluka-discuss_at_fluka.org
Cc: Bruce Andrew Schumm; anne.schuetz_at_desy.de
Subject: [fluka-discuss]: Problems with Energy Binning Control and Discontinuity Across High/Low Neutron Energy Boundary

Dear FLUKA Experts,

We're simulating the neutron flux that arises when a 10GeV electron beam strikes a Tungsten target.

The target geometry and requested energy binning (USRBDX) is shown in the attached .inp file.

We are looking at both the raw (Neutrons_tab.lis) and 1-MeV equivalent (1MeVNeut_tab.lis) neutron fluxes. For the output we believe we are requesting 20 energy bins between the beam energy and 1 KeV and we are having trouble interpreting the results.

In the 1 MeV equivalent output the requested course binning overlaps with the fine low energy neutron groups output. Expressed in flux/cmq/primary/GeV, the output seems to differ between the coarse and fine binning.

Although our binning requests in the input file for raw neutrons and 1 MeV equivalent neutrons are identical, for the raw neutron binning there is no overlap in the coarse and fine energy range. Again, though, expressed in flux/cmq/primary/GeV there appears to be a discontinuity at the high-energy low-energy boundary of 20 MeV.

We are perplexed by this behavior, and wonder if there is a problem in our input card or our interpretation of the output files. Any hints that you can provide will be greatly appreciated.

Sincerely,
Benjamin Smithers
Bruce Schumm
Santa Cruz Institute for Particle Physics


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Received on Fri Feb 03 2017 - 09:31:10 CET

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