Re: [fluka-discuss]: Scoring alphas in FLUKA using USRBIN

From: Srinidhi Bheesette <srinidhi.bheesette_at_cern.ch>
Date: Sun, 4 Sep 2016 14:26:29 +0200

Hi Francesco,

Thank you very much for you reply.
I have made the necessary changes and I am not able to score alphas(4-He)
on the conversion layer. But I still don't get any hits on the Silicon
detector layer which is separated from the conversion layer (Lithium) by a
40 microns metalization layer made of Aluminium (sorry I did not mention
this in my previous mail).

Is the metalization a problem or do I need to make more changes so that it
I can score on Silicon too?

Thanks in advance.

Cheers,
Shri

(Srinidhi Bheesette)

On 3 September 2016 at 13:12, Francesco Cerutti <Francesco.Cerutti_at_cern.ch>
wrote:

>
> Hi Shri,
>
> please read the manual, LOW-NEUT card, Note 5.
>
> In particular, you need to have pointwise treatment activated (which is
> already the case for PRECISIO defaults) as well as a LiF compound
> definition containing explicitly the LITHIU-6 material as elemental
> component. The latter has to be in turn defined by a MATERIAL card
> specifying monoisotopic composition (see again the manual and avoid the
> usual mistake mixing up the mass number in WHAT(6) - which is what you
> have to fill, with the number 6.0 - and the atomic weight in WHAT(2) - not
> to be filled at all -).
>
> Note in addition that your PART-THR card makes no sense, since 1eV is
> patently not an option as transport threshold, being 1keV the hard cutoff
> for everything but neutrons and photons.
> And, as a general rule, do not limit the full transport to 4-HELIUM only,
> as you did with IONTRANS, rather let it be applicable to all heavy
> and light ions (put HEAVYION, i.e. particle code -2, as explained in the
> manual).
>
> Best
>
> Francesco
>
> **************************************************
> Francesco Cerutti
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> tel. ++41 22 7678962
> fax ++41 22 7668854
>
> On Sat, 3 Sep 2016, Srinidhi Bheesette wrote:
>
> > Hi all,
> > I wish to score alphas produced by the reaction of thermal neutron(
> 0.025eV)
> > with Lithium Fluoride moderator.
> >
> > I am using a 0.025eV neutron point source for my simulations and scoring
> the
> > a silicon detector which is bonded to the moderator.
> > I have enabled the transport using the following card
> >
> > IONTRANS 4-HELIUM
> >
> >
> > and also changed the threshold to 1eV for alphas using the following
> card:
> >
> > PART-THR -1.E-9 4-HELIUM 0.0
> >
> >
> > Finally I score the flux on the moderator using the following card:
> >
> >
> > USRBIN 10. 4-HELIUM 22. 0.700067 0.880124
> > -0.10convalp
> >
> > USRBIN -0.702433 -0.5261 -0.11 256. 256.
> >
> > 1. &
> >
> >
> > and on the silicon detector using the following card:
> >
> >
> > USRBIN 10. 4-HELIUM 29. 0.700067 0.880124 0.10sialph
> >
> > USRBIN -0.702433 -0.5261 -0.096 256. 256. 1. &
> >
> >
> > But in vain, as I do not see any alpha particles scored. The fort files
> are
> > filled all with zeros.
> >
> > Please let me know where I am going wrong. Help would be greatly
> > appreciated.
> >
> > Thanks in advance.
> >
> > Cheers,
> > Shri
> >
> > (Srinidhi Bheesette)
> >
> >
>


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Received on Sun Sep 04 2016 - 16:14:46 CEST

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