AW: [fluka-discuss]: problem with MAGFLD routine in new FLUKA release

From: Senger, Anna Dr. <A.Senger_at_gsi.de>
Date: Wed, 22 Dec 2021 13:49:05 +0000

Dear Lev.
I had the problem with MAGFLD routine.
In old version of the FLUKA:
SUBROUTINE MAGFLD ( X, Y, Z, BTX, BTY, BTZ, B, NREG, IDISC )
in new:
SUBROUTINE MAGFLD ( X, Y, Z, T, BTX, BTY, BTZ, B, NREG, IDISC )

There is new parameter T . Maybe this is reason for error.

Regards
Anna

-----Ursprüngliche Nachricht-----
Von: owner-fluka-discuss_at_mi.infn.it <owner-fluka-discuss_at_mi.infn.it> Im Auftrag von Stefan E. Mueller
Gesendet: Mittwoch, 22. Dezember 2021 13:11
An: Lev Shekhtman <lshekhtm_at_mail.cern.ch>
Cc: fluka-discuss_at_fluka.org
Betreff: Re: [fluka-discuss]: problem with MAGFLD routine in new FLUKA release

Dear Lev,

it seems to me that FLUKA is complaining about the normalization of the
BTX, BTY, BTZ values. From the manual (MGNFIELD card, Note2) ):

(I)t is imperative that MAGFLD returns normalised values of
BTX, BTY and BTZ such that the sum of their squares is = 1.0
IN DOUBLE PRECISION.

Apparently, for your values this condition is not fulfilled (while it is
the case for the pre-defined UMGFLD, VMGFLD, WMGFLD values in the
CMEMFL-common, so if you have those values override your BTX, BTY, BTZ
this will of course work).

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
Vorstand: Prof. Dr. Sebastian M. Schmidt, Dr. Diana Stiller
Vereinsregister: VR 1693 beim Amtsgericht Dresden
On Tue, 2 Nov 2021, Lev Shekhtman wrote:
> Dear FLUKA experts, I got a problem with new FLUKA release. My MAGFLD routine 
> does not work any more. The old and new versions of MAGFLD are attached to 
> this mail. The old version was working properly with 2018, 2019 and 2020 
> releases. In the last release there are the following lines added:
>
>      BTX   = UMGFLD
>      BTY   = VMGFLD
>      BTZ   = WMGFLD
>      B     = BIFUNI
>
> that overwrite my field. If I remove them I get the following error:
>
> Abort called from MAGNEW reason U/V/WMGCUR UNNORMALIZED !! Run stopped!
> STOP U/V/WMGCUR UNNORMALIZED !!
>
> The same I get if I put my code after these lines. Please help.
>
> With best regards, Lev Shekhtman.
>
>
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Received on Wed Dec 22 2021 - 16:36:16 CET