Dear Andrea,
I am comparing FLUKA with Geant4. Even with very simplified geometries, I was finding some surprising differences in the particle energy spectra. Someone suggested firing neutrinos through just to rule out any odd effects of the physics modelling. But if neutrinos from SOURCE will still interact promptly then I guess I won’t be able to test this. Thanks for your help.
Cheers,
Paul
From: Andrea Celentano [mailto:andrea.celentano_at_ge.infn.it]
Sent: 04 July 2019 17:06
To: Paul Miyagawa <Paul.Miyagawa_at_cern.ch>
Cc: fluka-discuss_at_fluka.org
Subject: Re: [fluka-discuss]: Neutrino beam not propagated?
Dear Paul,
I do not understand completely the problem. Even if you use the SOURCE routine, the primary neutrinos will interact promptly in the generation position, and will not propagate in the geometry. Only secondary neutrinos propagate, without interacting.
In other words, it is not possible to fire neutrinos in location “A”, and then sample these primaries in another location “B”. In any case, since neutrinos propagate in a straight line, then you can simply use a RAY particle (a dummy particle that just propagates straight, see
http://www.fluka.org/fluka.php?id=man_onl&sub=7)
Bests,
Andrea
On Jul 4, 2019, at 17:32, Paul Miyagawa <Paul.Miyagawa_at_cern.ch<mailto:Paul.Miyagawa_at_cern.ch>> wrote:
Dear Andrea,
Thank you for your reply. All I really want to do is fire neutrinos through the geometry, so the DISCARD card was what I needed. However, I don’t want the forced primary interaction, so I think I will have to write a SOURCE routine rather than use the built in BEAM/BEAMPOS cards. Anyway, thanks again for your help.
Best,
Paul
From: Andrea Celentano [mailto:andrea.celentano_at_ge.infn.it]
Sent: 03 July 2019 08:14
To: Paul Miyagawa <Paul.Miyagawa_at_cern.ch<mailto:Paul.Miyagawa_at_cern.ch>>; fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>
Subject: Re: [fluka-discuss]: Neutrino beam not propagated?
Dear Paul,
for neutrinos, you have to distinguish the two cases.
1) Your primary beam particle is NOT a neutrino. In this case, neutrinos are produced in the simulation, but not transported. To have them transported - add the card:
* Enable all neutrinos tracking - no neutrino - material interactions in FLUKA (this is only a comment line)
DISCARD -ANEUTRIE -ANEUTRIM -ANEUTRIT -NEUTRIE -NEUTRIM -NEUTRIT
2) Your primary beam particle is a neutrino. In this case, the neutrino is forced to have, in each event, an interaction happening in the point (or area) defined by BEAMPOS card. Note that, also in this case, there may be secondary neutrinos (such as in neutral currents): for them, what said before applies.
However, from your question it seems you want to use a neutrino source, and score the neutrinos. Is this correct? Are you trying to score the primaryneutrinos? I don't think this can be done - however, primary neutrinos, in real world, would just propagate in a straight line. Instead, if you are interested in scoring the secondary neutrinos from the interaction (neutral current), follow point 1)
Bests,
Andrea
On 7/2/19 8:03 PM, Paul Miyagawa wrote:
Hello,
I'm trying to understand what happens with a neutrino source using a toy (spherical) geometry. I've tried both a beam and an isotropic source. From what I've tested, the neutrinos don't seem to be transported (no entries with USRBDX scoring). Reading in the online manual + past posts, it sounds like the primary neutrinos interact at the point of production ("Neutrino interactions are forced to occur in the point (or area) defined in the BEAMPOS card."), and the secondary neutrinos don't interact at all and therefore are not propagated? Is there an option to enable neutrino transport and therefore allow scoring of them? Thanks for any assistance.
Cheers,
Paul
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Received on Thu Jul 04 2019 - 19:50:12 CEST