Re: USRYIELD estimators

From: Buthaina Abdalla Suleiman Adam <buthaina@aims.ac.za>
Date: Sun May 11 2008 - 23:51:46 CEST

Hi
Thank you Paola, I used the part for USRYIELD card you email it to me in
order to get the neutron spectra at different angles, but when I run the
input file is always give this massage

"Saving output and random number seed
     No ranneutron-yield-me002 generated!
     No neutron-yield-me001.err generated!"

I attached the input file.

Regards,
Buthaina

> -
> Hi
> The Usryield estimator is different from the usrbdx estimator, in the
> sense that a sigle estimator does not give both angle and energy
> distributions:
> - it provides ethe "spectrum" as a function of the 1st variable, for
> instance energy, in ONE interval of the second variable, for instance
> angle, normalized as in double differential distribution.
> To get spectra at different angles one has to issue as many usryield cards
> as the number of wished angular bins.
>
> The usryield with sdum=beamdef card is normally NOT used. It is useful
> only in particular cases.
>
> For instance, with ( card not aligned..)
> USRYIELD 2399.0 NEUTRON -21.0 regBe5 regAi3 1.0nFluenUD1
> USRYIELD 0.2 1D-14 200.0 10.0 0.0 0.0&
> USRYIELD 2399.0 NEUTRON -21.0 regBe5 regAi3
> 1.0nFluenUD2
> USRYIELD 0.2 1D-14 200.0 20.0 10.0 0.0&
> USRYIELD 2399.0 NEUTRON -21.0 regBe5 regAi3
> 1.0nFluenUD3
> USRYIELD 0.2 1D-14 200.0 30.0 20.0 0.0&
> You'll get three neutron spectra, at 0-10, 10-20 and 20-30 degrees
>
> To make your life easier, I suggest to use FLAIR to build the input!
>
> Paola
>
>> dear Alberto,
>>
>> yes I have plotted it in log scale (the spectrum is attached). my
>> problem
>> is why I didn't get the peak for the fast neutron, do I need to
>> introduce
>> somthething else to my input file? it is the first time for me to use
>> USRYIELD estimators.
>>
>> Regards,
>> Buthaina
>>
>>
>>
>>> Hi Adam,
>>>
>>> have you tried to plot you spectrum on a log scale for abscissae?
>>> Probably most neutrons are evaporation neutrons, with energies
>>> 1-2 MeV. On a linear scale, they are all squeezed in a narrow interval
>>> about 1% of the whole scale
>>>
>>> Alberto
>>>
>>> On Fri, 9 May 2008, Buthaina Abdalla Suleiman Adam wrote:
>>>
>>>> Dear FLUKA user,
>>>>
>>>> I am using USRYIELD estimator to score neutron fluence (double
>>>> differential) produced from the interaction of 200 MeV (kinetic
>>>> energy)
>>>> proton beam with a thin target of Be-9 (1.2cm). The inputfile is
>>>> attached.
>>>> The result I obtained are not what I expected e.g the neutron spectrum
>>>> (see attached file) shows a trend which is opposite of what is
>>>> expected.
>>>> I
>>>> will be grateful for your input.
>>>>
>>>>
>>>> Kind Regards,
>>>> Buthaina Adam
>>>>
>>>>
>>>>
>>>
>>> --
>>> Alberto Fasso`
>>> 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
>>>
>>
>
>
> Paola Sala
> INFN Milano
> tel. Milano +39-0250317374
> tel. CERN +41-227679148
>
>
> Paola Sala
> INFN Milano
> tel. Milano +39-0250317374
> tel. CERN +41-227679148
>
>

Received on Mon May 12 15:24:01 2008

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