RE: Please suggest

From: Markus Brugger <Markus.Brugger@cern.ch>
Date: Fri May 16 2008 - 11:33:11 CEST

(smtp1.mi.infn.it [192.84.138.69]); Fri, 16 May 2008 11:34:09 +0200 (CEST)
Sender: owner-fluka-discuss@mi.infn.it

Hi,

there is another problem related to your question which was missed =
yesterday. As your source particles are 320 MeV Alphas FLUKA currently =
performs the 'transport', however does not perform 'interactions' (with =
the default RQMD being set to 100MeV/nucleon). To a limited extend, the =
sampling of 'interactions' could be reached by lowering the threshold of =
the RQMD model (PHYSICS card) but again the !!! lowest !!! possible =
limit (for 'interactions') is 51MeV, thus only of limited use in your =
case. In addition, by lowering this limit, especially for alphas, the =
accuracy of the results remains questionable.=20

Besides, and as a possible outlook for future FLUKA releases, a new BME =
model is currently under development however not yet available for =
public use.=20

Please find further information also in the following answer of the =
fluka-discuss list:

http://www.fluka.org/web_archive/earchive/new-fluka-discuss/0885.html=20

cheers

Markus

> -----Original Message-----
> From: Markus Brugger
> Sent: Donnerstag, 15. Mai 2008 14:38
> To: 'rravi@veccal.ernet.in'; fluka-discuss@fluka.org
> Subject: RE: Please suggest
>=20
> Hi,
>=20
> similar to the answer to Yuanjie it will depend if you are interested
> in particle energy fluence distributions 'only', or if you are
> interested by e.g., the angular distribution as well.
>=20
> USRBDX
> scoring average d2=D6/dEd=D9 (double-differential fluenceor current) =
of a
> given type or family of particles on a given surface (defined by the
> two 'touching' regions)
>=20
> USRYIELD
> scoring double differential yield of particles escaping from a
> surface. The distribution can be with respect to energy and angle, but
> also other more "exotic" quantities
>=20
> in addition, if you want to score the average fluence in a given =
volume
> (region) you can also apply one of the following two scoring options:
>=20
> USRTRACK, USRCOLL
> scoring average d=D6/dE (differential fluence) of a given type or
> family of particles in a given region
>=20
> -> see the manual for more details on each of the two cards
>=20
> hope this helps, cheers
>=20
> Markus
>=20
> > -----Original Message-----
> > From: owner-fluka-discuss@mi.infn.it [mailto:owner-fluka-
> > discuss@mi.infn.it] On Behalf Of rravi@veccal.ernet.in
> > Sent: Dienstag, 13. Mai 2008 08:04
> > To: fluka-discuss@fluka.org
> > Subject: Please suggest
> >
> > Hi All,
> >
> > I am new to this forum and also a novice user of Fluka. My =
best
> > regards to those great people who developed and made it available.
> > I have a problem. Can any body give me a suggestion ?
> >
> > I want to estimate the photon and neutron fluence emerging out of
> the
> > system
> > The system is:
> > 320 MeV Alpha beam falling on thick target of Tantalum; the =
emerging
> > neutrons etc falling on Fe cyclinder.
> > *******
> >
> > Is it possible to do that with 320 MeV alpha in Fluka?
> >
> > With best regards to all of you,
> >
> > R. Ravi Shankar
> > Scientific Officer,
> > Health Physics Unit,
> > VECC, 1/AF, Bidhan Nagar,
> > Kolkata 700 064.
> > India. Tel: +91 033 23371230-34 extn:3153
> > Tel (Residence): +91 033 23592432
Received on Fri May 16 14:43:56 2008

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