On 14.03.2015 17:10, f.h.green_at_surrey.ac.uk wrote:
>
> Hi Mikhail,
>
>
> I tried that and it didn't seem to make any difference. Could you
> please confirm the exact settings on the EMFCUT card that I should
> enter just to check I applied it correctly?
>
>
> Faith
>
> ------------------------------------------------------------------------
> *From:* "Mikhail Polkovnikov <Михаил Полковников>" <pmk_at_ihep.ru>
> *Sent:* 12 March 2015 18:02
> *To:* Green FH Miss (PG/R - Physics); fluka-discuss_at_fluka.org
> *Subject:* Re: [fluka-discuss]: modelling scatter
> On 12.03.2015 14:15, f.h.green_at_surrey.ac.uk wrote:
>>
>> Hi all,
>>
>>
>> I am trying to model the scatter produced from a low energy photon
>> beam (20 keV - 30 keV) interacting with a perspex block and being
>> detected by a thin layer of CdTe as my detector.
>>
>> A few questions I have are firstly I have chosen EM-CASCA but found I
>> was getting very little scatter in my spectrum so tried
>> PRECISION but I only got errors, is there a reason why PRECISION
>> wouldn't work?
>>
>> Secondly I played around with the EMFCUT and DELTARAY options but
>> this had no effect. Does anyone have any suggestions as to why you
>> think I am getting such a small amount of scatter on my spectrum?
>>
>>
>> Here are the beam characteristics I used:
>>
>> * 20keV photon beam
>> * Momentum spread (Δp) = flat – 0GeV/c
>> * Divergence type (Δφ) = Gauss – 100.00mrad
>> * Beam shape (x-axis) = Gauss – FWHM 0.05cm
>> * Beam shape (y-axis) = Gauss – FWHM 0.05cm
>>
>> The initial beam position was at -10cm on the z axis and the number
>> of start events was 1E7.
>>
>>
>> Thank you for any suggestions you may have
>>
>>
>> Faith
>>
>>
> Hi,
>
> It looks like some kind of a bug with low neutrons in DEFAULTS where
> LOW-NEUT is activated by default,
>
> Try to use EM-CASCA and photon particle transport threshold in 1 keV
> (EMFCUT card).
>
> Best regards,
> Mikhail
>
Hi,
What do you mean by saying "it didn't seem to make any difference"?
I don't know your exact geometry, but he is my test with fluences on
different angles after a small perspex target.
USRBDX card clearly shows a 20 keV peak and a spectrum of scattered
photons even without any threshold manipulations.
Best regards,
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Received on Sun Mar 15 2015 - 14:46:45 CET