Dear Mahmoudreza,
as mentioned below, I'd not set minimum and maximum step sizes (certainly
not a minimum step of 1 mm in 1 mm regions!), but I'd further decrease
the maximum error in the boundary identification.
Kind regards
Francesco
**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. +41 22 7678962
On Mon, 11 Feb 2019, Mrakbari2015_at_ast.ui.ac.ir wrote:
>
> Dear Dr. Cerutti
> Thanks alot for your nice reply.
> As an example, If the minimum and maximum dimensions along the charged
> particle beam path in a multi-layer media are 0.1 and 3 cm, respectively. Is
> it reasonable to select the following choices?
> in the MGNFIELD card:
> Minimum step size = 0.1 cm.
> The maximum angle in a sub-step (largest angle that a charged particle is
> allowed to travel in a single step)=30 degrees
> the maximum error in the boundary identification=0.05 cm
> Minimum and maximum step sizes in STEPSIZE card = 0.1 and 3 cm, respectively
> for all regions with various dimensions.
> Best,
>
>
> Quoting Francesco Cerutti <Francesco.Cerutti_at_cern.ch>:
>
> Hallo,
>
> to help the code to attain the required tracking accuracy in
> magnetic field, rather than setting min and max step sizes, the
> parameters that are recommended to be reasonably set by MGNFIELD
> and STEPSIZE are the max angle in a sub-step and the max error
> on the boundary identification, respectively, as discussed in
> the lecture
>
> https://indico.cern.ch/event/489973/contributions/2000443/attachments/12709
> 14/1883264/10_AdvancedMagneticField2016.pdf
>
> Kind regards
> Francesco
>
> **************************************************
> Francesco Cerutti
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> tel. +41 22 7678962
>
> On Fri, 1 Feb 2019, mrakbari2015_at_ast.ui.ac.ir wrote:
>
> Dear FLUKA experts
> I am working on carbon-ion radiotherapy. my question
> is that is it scientifically
> reasonable to asume the same minimum and maximum
> step sizes for all the regions with
> diferent densities, which physically should be
> selected according to the dimensions of
> that region and its neighbors? I mean, If one of the
> three condistions for selecting the
> step size when magnetic field is present isn't pass
> and in some regions the maximum step
> size is larger than the dimension of that region
> and/or its neighbor, what will hapen in
> the accuracy of the simulation? are the three
> conditions for selecting the maximum step
> size just recommendation or ther are mandatory to
> select?
> I thank you in advance and looking forward to
> hearing from you.
> *Sincerely Yours,"*
>
> /Mahmoudreza Akbari/
>
> /Ph.D. Candidate in Medical Radiation Engineering/
> //Department of Nuclear Engineering,/
> Faculty of Advanced Sciences and Technologies,
> University of Isfahan, Isfahan, Iran.
> AlternativeEmail: mrakbari2015_at_ast.ui.ac.ir <mailto:Email%3AMahmoudrezaakbari_at_yahoo.co
> m>/
> /Tel: 0098-09304403165/
>
>
>
>
>
>
>
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Received on Wed Feb 13 2019 - 00:32:28 CET