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> 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
>
> Sent from Mail
> <https://urldefense.com/v3/__https://go.microsoft.com/fwlink/?LinkId=550986__;!!IKRxdwAv5BmarQ!IbY9PP0qHSBJOECbPIBETqdstTI7fPNn0-SwNPXHef42BeuXrhBanIw8nuYqiA$>
> for Windows
>
> *From: *stefan.mueller_at_hzdr.de
> *Sent: *18 March 2022 09:11
> *To: *Ding, Qi <mailto:q.ding_at_fz-juelich.de>
> *Cc: *fluka-discuss_at_fluka.org
> *Subject: *Re: [fluka-discuss]: how to plot a bragg curve without
> ""zig zag""
>
> OK,
>
> the plot is now attached and visible. How did you obtain this plot? I
>
> assume we are seeing energy deposition over energy (which is the
> unit?
>
> MeV? keV?). Which scorer did you use? Which beam particle?
>
> Cheers,
>
> Stefan
>
> --
>
> Stefan E. Mueller
>
> Department of Information Services and Computing - Computational
> Science
>
> and Institute of Radiation Physics
>
> Helmholtz-Zentrum Dresden-Rossendorf
>
> Tel: +49 (0351) 260 3847
>
> Stefan.Mueller_at_hzdr.de
>
> http://www.hzdr.de
> <https://urldefense.com/v3/__http://www.hzdr.de__;!!IKRxdwAv5BmarQ!IbY9PP0qHSBJOECbPIBETqdstTI7fPNn0-SwNPXHef42BeuXrhBanIwnDGuDGA$>
>
> Vorstand: Prof. Dr. Sebastian M. Schmidt, Dr. Diana Stiller
>
> Vereinsregister: VR 1693 beim Amtsgericht Dresden
>
> On 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>
>
> > Sent: 18 March 2022 09:47:02
>
> > To: Ding, Qi
>
> > Cc: 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
>
> > 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
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Received on Fri Mar 18 2022 - 12:27:07 CET