Re: [fluka-discuss]: how to plot a bragg curve without ""zig zag""

From: Ding, Qi <q.ding_at_fz-juelich.de>
Date: Fri, 18 Mar 2022 15:58:22 +0000

Dear FLUKA experts,


Thanks a lot for your kind help.

I applied FLUKAFIX card and now the Bragg curve is no more wavy.

Thanks again.


Have a nice weekend and best regards,

Qi Ding

________________________________
From: owner-fluka-discuss_at_mi.infn.it <owner-fluka-discuss_at_mi.infn.it> on behalf of Giuseppe Battistoni <giuseppe.battistoni_at_mi.infn.it>
Sent: 18 March 2022 11:04:19
Cc: fluka-discuss_at_fluka.org
Subject: Re: [fluka-discuss]: how to plot a bragg curve without ""zig zag""


Instead of acting on STEPSIZE, it's much better to use FLUKAFIX (maximal fractional energy loss in a step)

See the lecture at link https://indico.cern.ch/event/694979/contributions/2927124/attachments/1657653/2654330/Ionization_and_Transport_2018.pdf with particular reference at slides 55-56-57-58

    G.B.

On 18/03/2022 10:37, Ryan Brosch wrote:
I'm sure this is it. Trying adding the STEPSIZE card

STEPSIZE 1E-3 .1 [region]

That should be fine for water.

On Fri, Mar 18, 2022 at 4:24 PM Tony Price <T.Price_at_bham.ac.uk<mailto:T.Price_at_bham.ac.uk>> wrote:
Dear all,

I am not a fluka user, I was but I went back to geant4 for other projects so cannot really comment on how fluka works properly but I have seen this shape produced in geant4 before if you do not limit the step lengths in the simulation as the higher energy protons interact less the average step length is longer and causes this shape. Might not help for fluka but could add to the discussion

Kind regards,

Tony

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From: stefan.mueller_at_hzdr.de<mailto:stefan.mueller_at_hzdr.de>
Sent: 18 March 2022 09:11
To: Ding, Qi<mailto:q.ding_at_fz-juelich.de>
Cc: fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>
Subject: Re: [fluka-discuss]: how to plot a bragg curve without ""zig zag""

OK,

the plot is now attached and visible. How did you obtain this plot? I
assume we are seeing energy deposition over energy (which is the unit?
MeV? keV?). Which scorer did you use? Which beam particle?

Cheers,

               Stefan

--
Stefan E. Mueller
Department of Information Services and Computing - Computational Science
and Institute of Radiation Physics
Helmholtz-Zentrum Dresden-Rossendorf
Tel: +49 (0351) 260 3847
Stefan.Mueller_at_hzdr.de<mailto:Stefan.Mueller_at_hzdr.de>
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On Fri, 18 Mar 2022, Ding, Qi wrote:
>
> Dear Stefan,
>
>
> Thanks for your email.
>
> I hope you can see the attached figure now.
>
>
> Best regards,
>
> Qi Ding
>
>
> ____________________________________________________________________________
> From: Stefan E. Mueller <stefan.mueller_at_hzdr.de<mailto:stefan.mueller_at_hzdr.de>>
> Sent: 18 March 2022 09:47:02
> To: Ding, Qi
> Cc: fluka-discuss_at_fluka.org<mailto:fluka-discuss_at_fluka.org>
> Subject: Re: [fluka-discuss]: how to plot a bragg curve without ""zig zag""
> �
> Dear Qi Ding,
>
> for some reason, the plot you mentioned did not attach to the email, could
> you post it again?
>
> Thank you,
>
> �������� Stefan
>
> --
> Stefan E. Mueller
> Department of Information Services and Computing - Computational Science
> and Institute of Radiation Physics
> Helmholtz-Zentrum Dresden-Rossendorf
> Tel: +49 (0351) 260 3847
> Stefan.Mueller_at_hzdr.de<mailto:Stefan.Mueller_at_hzdr.de>
> http://www.hzdr.de<https://urldefense.com/v3/__http://www.hzdr.de__;!!IKRxdwAv5BmarQ!IbY9PP0qHSBJOECbPIBETqdstTI7fPNn0-SwNPXHef42BeuXrhBanIwnDGuDGA$>
>
> Vorstand: Prof. Dr. Sebastian M. Schmidt, Dr. Diana Stiller
> Vereinsregister: VR 1693 beim Amtsgericht Dresden
>
> On Thu, 17 Mar 2022, Ding, Qi wrote:
>
> >
> > Dear FLUKA experts,
> >
> >
> > I want to draw a Bragg curve for a proton beam in water as below image.
> > The question is the Bragg curve isn�t smooth and as you can see there
> > evidently exist �zig
> > zag� form in the plateau region. I changed the binning in Z direction and
> it
> > appears the same problem again.
> > can anyone tell me, how can I solve this problem?
> > Thanks in advance.
> >
> > plot05
> > Best regards,
> >
> > Qi Ding
> >
> >
> >
> >
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--
Ryan Brosch
--
INFN Sezione di Milano
via Celoria 16, 20133 Milano
tel: +39 02 50317307
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Received on Fri Mar 18 2022 - 18:46:42 CET