[Getdp] soft iron influence (bis)

[Christophe Geuzaine]

quemener at isn.in2p3.fr wrote:
> 
> It seems that my previous mail was cut a little therefore I send it
> again:
> Hello,
> 
> Currently I am looking for methods in order to estimate the influence
> of a soft iron and mu metal shileding  on the magnetic field generated
> 
> by a toroidal superconducting magnet. I already have a computed map
> of this field in a source free region filled by air.  I would like to
> place
> within this region, some tubes made of soft iron and/or mu-metal and
> be able to compute the resulting magnetic field in the air contained
> in
> the tube hole as well as in the air surrounding the tube. The
> dimensions
> of the tubes are small compared to the diemnsions of the map.
> As I am not yet a GetDP user, I am wondering if this program is an
> appropriate tool for such a study and if this is the case, could
> anybody
> provide me with some hints on how to start.
> Thanks a lot for any clues,
> 

Hi,

Three questions to better understand your problem: 

- is the field created by the superconducting magnet a static field?
- why do you have to pre-compute (analytically?) this source field?
- do you feel capable of writing approximate equations for the small
magnetic tubes? Or do you think you could mesh these tubes?

I don't have time to write formulations for you (that's your job ;-),
but I may answer specific questions if you feel capable of developing
the formulations by yourself. BTW, do you think you'll have to take the
nonlinear characteristics of he materials into account? Otherwise, you
may consider using a boundary element method with special "1D" elements
to model the tubes.

Christophe


-- 
Christophe Geuzaine

Tel: 32 (0) 4 366 37 10    http://geuz.org
Fax: 32 (0) 4 366 29 10    mailto:Christophe.Geuzaine at ulg.ac.be