Ok, thank you Mario.
- Do I need to do anything specific with the step-size inside a magnetic
field region?
- How does one find the optimum step-size if the region is not filled with
vacuum?
- Is the default step-size in a magnetic field region written out
somewhere in the output files?
Thank you in advance,
Mina
> Yes, it does.
>
>
> On 2/24/14 12:20 PM, "Mina Nozar" <nozarm_at_triumf.ca> wrote:
>
>>Thank you Mario and Francesco. I am clear on this now.
>>
>>I do have another question. Does FLUKA handle magnetic field through
>>non-vacuum regions?
>>We have a case here where the vacuum box region of a bending magnet
>>upstream of the 100 kW beam dump can be filled with stainless steel.
>>This is to get the back-scattered electrons shower in the s.s. region
>>with the s.s. providing some attenuation for photons. The energy of the
>>back-scattered electrons (going through the beam pipe is below 10 MeV.
>>
>>I don't see any obvious bending happening when I turn the material in
>>the B field region to s.s. Maybe it is because the B field immediately
>>steers the electrons into the s.s. region.
>>
>>Just wanted to make sure the FLUKA allows for having magnetic field
>>inside a non-vacuum region.
>>
>>Thanks a lot,
>>Mina
>>
>>On 14-02-18 12:43 PM, Santana, Mario wrote:
>>> No, you always need to set the appropriate flag in ASSIGNMAT,
>>> regardless
>>> whether you use a simple field (MAGNFIELD only) or a programmed one
>>> (magfld.f) .
>>>
>>
>>On 14-02-18 11:50 AM, Francesco Cerutti wrote:
>>>
>>> Not at all. A region will be considered as magnetic only if it is
>>> declared as such in the respective ASSIGNMAT card. And the reason for
>>> that is what I indicated below as second and more important argument.
>>>
>>> Cheers
>>>
>>> Francesco
>>>
>>> **************************************************
>>> Francesco Cerutti
>>> CERN-EN/STI
>>> CH-1211 Geneva 23
>>> Switzerland
>>> tel. ++41 22 7678962
>>> fax ++41 22 7668854
>>> On 2/18/14 11:17 AM, "Mina Nozar" <nozarm_at_triumf.ca> wrote:
>>>
>>>> Dear Francesco,
>>>>
>>>> So do I understand correctly that if one needs to assign/associate a
>>>> magnetic field to a region of interest in the ASSIGNMAT card, if one
>>>> uses the MAGNFIELD card for a simple magnetic field setting but NOT if
>>>> one uses the magfld.f to set and assign the magnetic field to a given
>>>> region.
>>>>
>>>> Thanks and best wishes,
>>>> Mina
>>>>
>>>> On 14-02-14 12:57 PM, Francesco Cerutti wrote:
>>>>> Dear Mina,
>>>>>
>>>>> first of all we just saw with Brandon that, if you are fine with a
>>>>> constant field, you do not need to write a magfld.f routine but it is
>>>>> enough to define it in the MGNFIELD card. Then ASSIGNMAT is essential
>>>>> to tell the code in which regions that field should be applied.
>>>>>
>>>>> Furthermore and more important, you definitely do not want to ask the
>>>>> code to go always through the magnetic tracking algorithm - by far
>>>>> more complex than a straight step - despite the fact that no magnetic
>>>>> field is present in your region, and to call the magfld.f routine at
>>>>> each substep to get back a humiliating zero.
>>>>>
>>>>> Ciao
>>>>>
>>>>> Francesco
>>>>>
>>>>> **************************************************
>>>>> Francesco Cerutti
>>>>> CERN-EN/STI
>>>>> CH-1211 Geneva 23
>>>>> Switzerland
>>>>> tel. ++41 22 7678962
>>>>> fax ++41 22 7668854
>>>>>
>>>>> On Fri, 14 Feb 2014, Mina Nozar wrote:
>>>>>
>>>>>> Hello Francesco and everyone else.
>>>>>>
>>>>>> Just trying to understand the flow/logic of assigning magnetic
>>>>>> fields
>>>>>> in a region.
>>>>>>
>>>>>> Here is my understanding and a question where I lack
>>>>>> understanding...
>>>>>>
>>>>>> 1) MGNFIELD card activates calling the subroutine MAGFLD defined in
>>>>>> mgfld.f
>>>>>> 2) In subroutine MAGFLD, one defines the intensity and direction of
>>>>>> the magnetic field(s) and assigns it to a given region(s).
>>>>>> 3) Set Field to Magfiled in the ASSINMAT card for the region(s) with
>>>>>> magnetic field.
>>>>>>
>>>>>> What I don't understand is why do we need to turn on magnetic field
>>>>>> in the ASSIGNMAT card? Is this not already set via MAGFLD?
>>>>>>
>>>>>> Best wishes,
>>>>>> Mina
>>>>>>
>>>>>> On 14-02-14 01:57 AM, Francesco Cerutti wrote:
>>>>>>> Hallo,
>>>>>>>
>>>>>>> actually, in case of constant magnetic field in all magnetic
>>>>>>> regions, the
>>>>>>> MGNFIELD card is enough (as stated in the manual). It will
>>>>>>> automatically
>>>>>>> feed the default magfld routine (the one provided in usermvax,
>>>>>>> where in
>>>>>>> fact the comment
>>>>>>> * 2 Tesla uniform field along +z:
>>>>>>> does not apply) and you do NOT need to link the latter into a
>>>>>>> customized
>>>>>>> executable, unless you want to modify it, since it is already in
>>>>>>>the
>>>>>>> standard FLUKA library and linked in the standard executable.
>>>>>>>
>>>>>>> Cheers
>>>>>>>
>>>>>>> Francesco
>>>>>>>
>>>>>>> **************************************************
>>>>>>> Francesco Cerutti
>>>>>>> CERN-EN/STI
>>>>>>> CH-1211 Geneva 23
>>>>>>> Switzerland
>>>>>>> tel. ++41 22 7678962
>>>>>>> fax ++41 22 7668854
>>>>>>>
>>>>>>> On Thu, 13 Feb 2014, Dr. Vittorio Boccone wrote:
>>>>>>>
>>>>>>>> No you should still include and link the default magfld routine
>>>>>>> which is
>>>>>>>> configured for a uniform magnetic field, as explained in the
>>>>>>> lecture and > the
>>>>>>>> tutorial.
>>>>>>>> Best
>>>>>>>> V.
>>>>>>>> Sent from my iPad
>>>>>>>>> On 13/feb/2014, at 22:42, "REDDELL, BRANDON D. (JSC-EV511)"
>>>>>>>> <brandon.d.reddell_at_nasa.gov> wrote:
>>>>>>>>> Thanks Vittorio.
>>>>>>>>> So in my simple problem, I am not using the magfld.f
>>>>>>> routine,
>>>>>>>> just only the MGNFIELD card. So, could you confirm if
>>>>>>>> these
>>>>>>>> cards should work:
>>>>>>>>> MGNFIELD 20.0 0.2 0.10 0.0
>>>>>>>> 0.0 1.0
>>>>>>>> STEPSIZE 0.5 0.0 VAC2 0.0
>>>>>>>> 0.0 0.0
>>>>>>>> EMF
>>>>>>>> EMF-OFF
>>>>>>>> .
>>>>>>>> .
>>>>>>>> .
>>>>>>>> ASSIGNMA VACUUM VAC2 1.0
>>>>>>>> (the 1 here is at WHAT(5)
>>>>>>>>> Thanks.
>>>>>>>>> Brandon
>>>>>>>
>>>>>>>_____________________________________________________________________
>>>>>>>__
>>>>>>> _____
>>>>>>>>> From: Vittorio Boccone [dr.vittorio.boccone_at_ieee.org]
>>>>>>>> Sent: Thursday, February 13, 2014 2:47 PM
>>>>>>>> To: REDDELL, BRANDON D. (JSC-EV511);
>>>>>>>>fluka-discuss_at_fluka.org
>>>>>>>> Subject: Re: [fluka-discuss]: magnetic field in vacuum
>>>>>>>>> Sure, check out the magnetic field exercise (solution) on the
>>>>>>> advanced
>>>>>>>> course:
>>>>>>>>
>>>>>>>
>>>>>>>http://www.fluka.org/fluka.php?id=course&sub=program&navig=2&which=tr
>>>>>>>iu
>>>>>>> mf20
>>>>>>>>> 12
>>>>>>>> Best
>>>>>>>> V.
>>>>>>>>> On 2/13/2014 8:47 PM, REDDELL, BRANDON D. (JSC-EV511) wrote:
>>>>>>>>> FLUKA Users/Experts,
>>>>>>>>>>> Do the magnetic field settings in a region (using
>>>>>>> MGNFIELD
>>>>>>>> card along with WHAT card 5 in ASSIGNMA Card) work if the
>>>>>>>> region of the B field is a vacuum?
>>>>>>>>>>> Brandon
>>>>>>>>>>>
>>>>>>
>>>
>>
>
>
>
Received on Tue Feb 25 2014 - 22:44:20 CET