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/1270914/1883264/10_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.
>> Alternative
>> Email: mrakbari2015_at_ast.ui.ac.ir <mailto:Email%3AMahmoudrezaakbari_at_yahoo.com>/
>> /Tel: 0098-09304403165/
>>
>
>
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Received on Mon Feb 11 2019 - 19:27:31 CET