Dear Brandon
please keep the discussion on the list, considering the huge interest
captured by magnetic field, as proved in parallel by Mina's stimulating
posts.
As previously stated, your MGNFIELD card, coupled to ASSIGNMA, is
perfectly working without any additional magfld.f routine. You can realize
it yourself by plotting the field through the Flair geometry plot
referring for instance to the Geoviewer horizontal cut (green), as I just
did. Moreover, if you send in the field a particle with appropriate
momentum, you will be able to appreciate its trajectory bending by
displaying a USRBIN fluence scoring.
The coordinates of the magnetic regions are totally immaterial, since in
MGNFIELD you are defining a vector which is applied in all points of those
regions.
The fact that you cannot see any difference depends on the combination of
your particle direction/momentum with your field direction/intensity and
on the position/geometry of your detector.
Best
Francesco
**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854
On Fri, 14 Feb 2014, REDDELL, BRANDON D. (JSC-EV511) wrote:
> Francesco,
>
> I used the following CARDs (cut out from my inp file) to define a uniform 1 Tesla field (and also a second run of 10 Tesla) and noticed no difference in the flux across the surface of a sphere at the origin as compared to the same run with the field turned off. So, if the region where the field is supposed to be is not on the coordinate axes, do I need to use magfld.f?
>
> Brandon
>
>
>
> 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
> *---o---- ----o---- ----o---- ----o---- ----o---- ----o---- ----o---- ----o----
> GEOBEGIN COMBNAME
> 0 0 Targets
> SPH BLKH 0.0 0.0 0.0 5.D4
> SPH SPCE 0.0 0.0 0.0 2.5D4
> * BField Region
> RCC B1 0.0 0.0 -1000.0 0.0 0.0 2000.0 1030.0
> RCC B2 0.0 0.0 -1000.0 0.0 0.0 2000.0 400.0
> * Det 1
> SPH D01a 0.0 0.0 0.0 28.2095
> SPH D01b 0.0 0.0 0.0 27.2095
> *
> END
> BH 5 +BLKH -SPCE
> VAC1 5 +SPCE -B1
> VAC2 5 +B1 -B2
> VAC3 5 +B2 -D01a
> D01 5 +D01a -D01b
> *
> .
> .
> *---o---- ----o---- ----o---- ----o---- ----o---- ----o---- ----o---- ----o----
> ASSIGNMA BLCKHOLE BH
> ASSIGNMA VACUUM VAC1
> ASSIGNMA VACUUM VAC2 1.0
> ASSIGNMA VACUUM D01
> .
> .
> .
>
> -----Original Message-----
> From: Francesco Cerutti [mailto:Francesco.Cerutti_at_cern.ch]
> Sent: Friday, February 14, 2014 3:58 AM
> To: Dr. Vittorio Boccone
> Cc: REDDELL, BRANDON D. (JSC-EV511); FLUKA discussion
> Subject: Re: [fluka-discuss]: magnetic field in vacuum
>
>
> 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=tri
>> umf20
>> 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 Fri Feb 14 2014 - 22:36:42 CET