From: Alberto Fasso' (fasso@SLAC.Stanford.EDU)
Date: Thu Jul 26 2007 - 09:24:34 CEST
Mary is right: setting the cutoff at the first energy group with
LOW-BIAS does not turn off the initializations. But there is
a trick: use LOW-BIAS, plus LOW-MAT to "alias" neon to something
else (oxygen, for instance). Normally this would be a very bad thing to
do, because the cross sections of two different elements are always
very different: but in this case where the cross sections are not used
it does no harm, and allows you to run without neutrons.
On Wed, 25 Jul 2007, Giuseppe Battistoni wrote:
> Strange: I confirm instead that LOW-BIAS should be the right command to
> avoid low-energy neutron transport
> Did you give the right parameters? For instance: did you set it for ALL
> the regions of your problems?
> On Tue, 24 Jul 2007, email@example.com wrote:
>> I need neon, but can't find it in Table 10.3 for low-energy neutron
>> transport. So, I'd like to turn off low-neut so that the simulation runs.
>> I've only found one way to get the simulation running. That is by setting
>> DEFAULTS to EM-CASCAde. But I don't want all the other things that come in
>> package with EM-CASCAde, I only want low-neut to be turned off.
>> The manual says, "Low-energy neutron transport (if not already on by default)
>> can be activated with option LOW–NEUT. Explicit suppression is not possible:
>> but the same effect can be obtained using option LOW–BIAS to set a cut-off at
>> group 1." But I think LOW-BIAS can't solve my problem because the simulation
>> would still try to initialise low-neut at the beginning of the simulation,
>> which causes an error and the simulation refuses to run.
>> Please help.
>> Many thanks,
-- Alberto Fassň SLAC-RP, MS 48, 2575 Sand Hill Road, Menlo Park CA 94025 Phone: (1 650) 926 4762 Fax: (1 650) 926 3569 firstname.lastname@example.org
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