USERWEIG card

Dear Fluka experts,

Thanks for previous help. I am having a problem over USERWEIG card.

My aim is to score Neutron dose equivalent using USRBIN card for different
regions, as you may see in USRBIN cards. I used AUXSCORE card to filter the
dose equivalent for neutron. The matter is that I only want to score dose
equivalent in different regions for 1 to 20 MeV of neutrons and thats why I
am using the USERWEIG card and to activate USERWEIG card the Fortran
routine *comscw.f* is modified (Kindly by Mr. Vasilis) to *comscw_mod.f. *I
noticed that with and without USERWEIG card I see the same dose equivalent
in different regions, which I dont expect. I attached dose equivalent for *with
and without USERWEIG* card, 5 runs for 10^6 partilces. Could you please
suggest, what I am doing wrong and how to solve that. * *

Attached is my updated fluka input and comscw_mod.f routine.
Regards

Mohammad
PhD student, Oklahoma State University
USA

On Tue, May 15, 2012 at 3:45 AM, Vittorio Boccone <boccone_at_cern.ch> wrote:

> Dear Mohammad, I deeply apologize as I come to your request to the list
> so late,
>
> I see from the flair file you have a comscw.f which you didn't include
> in the mail so I can't run exactly your executable.
>
> Divergence is the correct approach, mind that you will obtain a
> "circular" distribution in this case.
>
> And yes you can use a source routine to generate directly your
> rectangular 20x20 particle distribution at the snout.
>
> You can (for example) score proton fluence at the snout to check the
> uniformity of your beam, or save the particle at a boundary crossing
> using ad USERDUMP card + mgdraw routine etc...
>
> Vittorio
> On 21/04/2012 23:38, Mohammad Islam wrote:
> > Dear Fluka Experts,
> >
> > My sincere gratitude to Mr. Vasilis for his previous help.
> >
> > I am trying to model a problem for a simplified snout, where I am
> > finding problem in beam definition. My problem is, *I want the start
> > of proton source as a point source and at 200 cm downstream the beam
> > should be uniformly distributed in a rectangular cone which covers
> > 20X20 cm area*. I dont know how to do it, I initially thought the BEAM
> > card with appropriate divergence can handle this problem. But I
> > guess,I am wrong. Do I need to use source routine? If so, please some
> > body help me with an example as I am fairly new to fluka. All my work
> > is done using FLAIR.
> >
> > Any kind of help is appreciated. Attached is my input and flair file.
> >
> > Sincerely
> > Mohammad
> > PhD student, Oklahoma State University
> > USA
> >
>
>
> --
> Dr. Vittorio Boccone - University of Geneva
>
> o Address:
> UniGe: Département de physique nucléaire et corpusculaire
> 24 Quai Ernest-Ansermet, CH-1211 Geneve 4, Switzerland
> CERN: CERN, CH-1211 Geneve 23, Switzerland
>
> o E-mail:
> vittorio.boccone_at_unige.ch
> vittorio.boccone_at_cern.ch
>
> o Phone:
> Mobile: +41 76 487 5737
> UniGe: +41 22 379 6357/6353
> CERN: +41 22 767 5821
>
>