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SUMMARY:Mon-Mo-Po1.02-08 [20]: Accurate calculation of field expansion coe
fficients in FEM magnetostatic simulations
DTSTART;VALUE=DATE-TIME:20190923T161500Z
DTEND;VALUE=DATE-TIME:20190923T181500Z
DTSTAMP;VALUE=DATE-TIME:20201201T124201Z
UID:indico-contribution-3415914@indico.cern.ch
DESCRIPTION:Speakers: Vasily Marusov (GSI Helmholtzzentrum für Schwerione
nforschung GmbH)\nFEM simulations are a standard step in the design of acc
elerator magnets. It is custom for accelerator applications to characteriz
e the field quality in terms of field expansion coefficients. Expansion co
efficients are usually calculated by means of a Fourier transform of the l
ocal FEM solution evaluated at points on a circle (2D) or cylinder (3D cas
e). The accuracy of the coefficients calculated this way depends strongly
on the FEM mesh configuration and simple refinement of the mesh does not a
lways improve accuracy. The accuracy of the expansion coefficients calcula
tion can be improved by using the data on the magnetization of elements in
the magnet yoke\, obtained in the solution\, instead of using directly th
e local solution. Since currents and the yoke magnetization are the only s
ources of the field\, with these data the field expansion coefficients can
be calculated at any remote point. We derive closed forms for calculating
expansion coefficients and implemented these results in the ANSYS® add-o
n. Results for a case study are presented\, which demonstrate that expansi
on coefficients can be calculated with good accuracy even for a rather coa
rse mesh.\n\nhttps://indico.cern.ch/event/763185/contributions/3415914/
LOCATION: Level 2 Posters 1
URL:https://indico.cern.ch/event/763185/contributions/3415914/
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