Date: Thu, 14 Mar 2024 09:19:38 +0000
Dear Alfredo.
The pictures present beam profile. I checked energies of these hot spots: the are exact proton beam energy.
I checked other settings for magnetic field and used simple implementation: Bx=0, By=-0.45, Bz=0. The behavior is the same (see picture). Argon and PROPANEL (and H-LIQUID) are standard materials from FLAIR:
* Propane liquid C3_H8
*
MATERIAL 0.43 PROPANEL
COMPOUND -0.182855 HYDROGEN -0.817145 CARBON PROPANEL
MAT-PROP 52.0 PROPANEL
STERNHEI 3.5529 0.2861 2.6568 0.10329 3.562 PROPANEL
I add new input with new settings. It is simple to use. May be I need to add some physics or/and transport parameters, but I don't understand what exactly.
Regards
Anna
________________________________
Von: aferrari <alfredo.ferrari_at_mi.infn.it>
Gesendet: Mittwoch, 13. März 2024 21:43
An: Senger, Anna Dr.
Cc: 'fluka-discuss_at_fluka.org'
Betreff: Re: [fluka-discuss]: Proton beam profile after liquid target in magnetic field
Dear Anna
I'll try to help understanding what you see, but first of all I have a
few questions:
a) the plots you sent, do they refer to the BEAMPART or the ALL-PART
binnings?
b) could you provide the magnetic field routine, or at least some guess
about its intensity and direction?
c) is the ARgon target Argon gas and if so at which pressure/density?
d) what is PROPANEL (composition? density?)?
As an observation, possibly unrelated to your question, a maximum
deflection per step of 40 deg is quite large and it could result in
relatively sloppy tracking. Also the requested boundary accuracy of 0.05
cm -> 500 um which is comparable or larger than the the thickness of
some of your volumes, again it is likely unrelated to what you observe
but it can result in inaccurate tracking.
Ciao
Alfredo
On 2024-03-12 10:48, Senger, Anna Dr. wrote:
> Dear FLUKA experts.
> I'm not so familiar with simulation of the proton beam and liquid
> target, and I would like to ask: if this beam profile in magnetic
> field is artefact of the FLUKA implementation for gas and liquid
> targets or there are some problems.
> I used simple input: only vacuum as a cave, different target materials
> and magnetic field in target region. I got different beam profiles at
> 15 m from the target for different target materials. I expected to get
> some smooth distribution. Could you please help me to understand my
> results.
>
> Best regards
> Anna Senger
>
> ______________________________________
>
> Dr. Anna Senger
>
> Office KBW 2.01
> Tel. +49(0)615971 1844
> E-Mail A.Senger_at_gsi.de
>
> FAIR - Facility for Antiproton and Ion Research in Europe GmbH
>
> Planckstr. 1
> 64291 Darmstadt
> DEUTSCHLAND
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(image/png attachment: ppreactions_pbeam_By0.45.png)
- chemical/x-gamess-input attachment: pp_test.inp