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.
Alberto
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?
>
> Giuseppe
>
> On Tue, 24 Jul 2007, me@marychin.org wrote:
>
>> Hi.
>>
>> 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,
>> mary
>>
>>
>
>
>
>
>
-- Alberto Fassň 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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