DocumentCode :
975364
Title :
Finite Element Design and Magnetization Issues of Ring-Shaped Cryo-Permanent Magnets
Author :
Sander, Michael
Author_Institution :
Forschungszentrum Karlsruhe
Volume :
16
Issue :
2
fYear :
2006
fDate :
6/1/2006 12:00:00 AM
Firstpage :
1558
Lastpage :
1561
Abstract :
Trapped peak magnetic fields beyond 15 T obtained for melt-textured 123-High-Temperature Superconductor (HTS) bulk cylinders, make these materials highly attractive for cryo-permanent magnets (CPM). However, to in-situ magnetize such HTS bulk parts using pulsed copper coils, and, in particular to reduce the required peak magnetic field, is a key issue for turning the proven material performances into practical magnetic devices. Novel concepts like the injection-current assisted pulsed magnetization of ring-shaped CPM´s are needed. Based on the modeling of the superconducting HTS bulk properties and finite element designs this approach is investigated semi-quantitatively. A still simple but very compact design taking into account all components of the resonant structure, has been chosen. Time evolutions of magnetic field profiles are presented. The results reflect the complexity of such highly dynamic and nonlinear magnetization processes. Comparisons are made for two different multi-pulse sequences without and with current injection. The latter obviously always leads to a higher trapped magnetic flux. Thus the presented model calculations gives confidence that based on further optimizations even trapped magnetic field profiles of les 5 T over ges 10 cm can be achieved with pulsed copper coils
Keywords :
copper; finite element analysis; high-temperature superconductors; magnetic flux; magnetisation; melt texturing; optimisation; permanent magnets; superconducting magnets; finite element design; injection-current; magnetic devices; melt-textured 123-high-temperature superconductor bulk cylinders; optimization; pulsed copper coils; pulsed magnetization; ring-shaped cryopermanent magnets; trapped magnetic flux; trapped peak magnetic fields; Finite element methods; High temperature superconductors; Magnetic devices; Magnetic fields; Magnetic flux; Magnetic materials; Magnetization; Superconducting coils; Superconducting magnets; Superconducting materials; Finite element methods; high-temperature superconductors; magnetization processes; magnets; superconducting magnets;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2005.869657
Filename :
1643153
Link To Document :
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