DocumentCode :
1430089
Title :
BSCCO MRI Magnet Winding and Testing at 
Temperature
Author :
Xu, Minfeng ; Laskaris, Evangelos T. ; Budesheim, Eric ; Conte, Gene ; Huang, Xianrui ; Stautner, Wolfgang ; Amm, Kathleen
Author_Institution :
Global Res. Center, Gen. Electr. Co., Niskayuna, NY, USA
Volume :
20
Issue :
3
fYear :
2010
fDate :
6/1/2010 12:00:00 AM
Firstpage :
769
Lastpage :
772
Abstract :
A limb size MRI magnet coldmass has been constructed using DI-BSCCO tapes from Sumitomo. The coils were wound with epoxy pre-impregnated fiberglass cloth (pre-preg) between layers to bond the wires. For radial dimensional control, temperature was elevated during the winding to thin out the epoxy and to adjust the pre-preg cloth layer thickness in order to control the coil build up. The wire tension was controlled within 1 kg with a set of moving pulleys. While the coils appeared solid after winding and curing, issues were found in the leads between coils. When the coldmass was cooled down to liquid nitrogen temperature, breaks in wire leads were found. Thermal expansion and contraction mismatch between the coil bobbin and the BSCCO tape was attributed to the leads break. The thermal stress was induced both in the oven curing and the cooling processes. Preliminary testing results at temperature are discussed. The magnet was designed to have a center field of 1.5 T operating at a liquid neon (LNe) temperature of 27 K.
Keywords :
biomedical MRI; bismuth compounds; high-temperature superconductors; strontium compounds; superconducting magnets; superconducting tapes; thermal expansion; thermal stresses; winding (process); BSCCO MRI magnet winding; Bi2Sr2CanCun+1O2n+6+x; DI-BSCCO tapes; Sumitomo; coil bobbin; contraction mismatch; curing; epoxy preimpregnated fiberglass cloth; leads break; limb size MRI magnet coldmass; liquid neon temperature; liquid nitrogen temperature; magnet testing; magnetic flux density 1.5 T; pre-preg cloth layer thickness; temperature 27 K; thermal expansion; thermal stress; wire tension; BSCCO; DI-BSCCO; high-temperature superconductors; liquid nitrogen $({rm LN}_{2})$
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2010.2040822
Filename :
5422866
Link To Document :
