On 01.09.2016 13:12, Mikhail Polkovnikov <Михаил Полковников> wrote:
> On 31.08.2016 17:14, Trinh Ngoc-Duy wrote:
>> Dear Fluka users,
>>
>> I'm using FLUKA to calculate the production rate of particle by
>> interaction of a primary beam with a thick target. I'm using USR
>> Track to obtain the spectre of particle produced in the target. I see
>> that USR TRACK give results with units of particle /(cm2/GeV/primary
>> beam).
>>
>> So if I send a beam into a target. The reaction is happen*inside the
>> target*, and i score the spectre of produced proton for example. I
>> obtain the total flux of proton :
>>
>> 8 proton /(cm2/GeV/primary beam). with a energy bin of [0:0.1] GeV.
>>
>> The target is a box with each side of 1 cm. So the area of a face is
>> : 1*1=1cm2.
>>
>> To obtain the total production rate of proton, i multiple 8*0.1*1=0.8
>> (proton per primary beam).
>>
>> I'm not sure about this value because when I simulate a isotropic
>> beam *inside* a target, and score the total flux with the same
>> method. Normally i should obtain the value of 1 because my target
>> cover all the beam. But FLUKA gives me 6.1 (proton/cm2/GeV/primary
>> beam) = 6.1*1*0.1=0.61 (proton per primary beam) (with a energy bin
>> of [0:0.1] GeV).
>>
>> I put my input and my results in attachment. Please give me an idea.
>>
>> Thank you very much.
>>
>> ND Trinh, GANIL, France.
>>
>>
>>
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>
> Dear ND Trinh,
>
>
> The track length of each proton produced inside of the thick target is
> different! Even in you example with isotropic source, the track length
> within the target varies from minimum (half of the edge) to maximum
> (half of the diagonal). As it shown in *sum.lis file:
>
>
> Tot. response (p/cmq/pr) 0.6107748 +/- 2.8535640E-02 %
> ( --> Track l. (cm/pr) 0.6107748 +/- 2.8535640E-02 % )
>
>
> Best regards,
>
> Mikhail
>
Dear ND Trinh,
Forgot to mention!
In your example, the ratio (Total fluence / track-length) is exactly 1.0
with units [number of particles per primary per cm^3].
Best regards,
Mikhail
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Received on Thu Sep 01 2016 - 19:15:17 CEST