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Test of an 8.66-T REBCO Insert Coil with Overbanding Radial Build for a 1.3-GHz LTS/HTS NMR Magnet.

Title: Test of an 8.66-T REBCO Insert Coil with Overbanding Radial Build for a 1.3-GHz LTS/HTS NMR Magnet.
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Name(s): Qu, Timing, author
Michael, Philip C, author
Bascuñán, Juan, author
Lécrevisse, Thibault, author
Guan, Mingzhi, author
Hahn, Seungyong, author
Iwasa, Yukikazu, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2017-06-01
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: A 1.3-GHz/54-mm LTS/HTS NMR magnet, assembled with a 3-coil (Coils 1-3) 800-MHz HTS insert in a 500-MHz LTS NMR magnet, is under construction. The innermost HTS insert Coil 1 has a stack of 26 no-insulation (NI) double pancake (DP) coils wound of 6-mm wide and 75-m thick REBCO tapes. In order to keep the hoop strains on REBCO tape < 0.6% at an operating current of 250 A and in a field of 30.5 T, we overbanded each pancake in Coil 1 with a 6-mm wide, 76-m thick 304 stainless steel strip: 7-mm thick radial build for the central 18 pancakes, while 6-mm thick for the outer 2×17 pancakes. In this paper, Coil 1 was successfully tested at 77K and 4.2 K. In the 77-K test, the measured critical current was 35.7 A, determined by an -field criterion of 0.1 V/cm. The center field magnet constant decreased from 34.2 mT/A to 29.3 mT/A, when increased from 5 A to 40 A. The field distribution at different along the -axis was measured. The residual field distributions discharged from 10 A and 20 A were recorded. In the 4.2-K test, Coil 1 successfully generated a central field of 8.78 T at 255 A. The magnet constant is 34.4 mT/A, which is same as our designed value. The field homogeneity at the coil center within a 15-mm region is around 1700 ppm. This large error field must be reduced before field shimming is applied.
Identifier: FSU_pmch_28827976 (IID), 10.1109/TASC.2016.2633626 (DOI), PMC5562375 (PMCID), 28827976 (RID), 28827976 (EID)
Keywords: NMR magnet, Double pancake, No-insulation, Overbanding
Grant Number: R01 GM114834
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5562375.
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_28827976
Owner Institution: FSU
Is Part Of: IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee.
1051-8223
Issue: iss. 4, vol. 27

Choose the citation style.
Qu, T., Michael, P. C., Bascuñán, J., Lécrevisse, T., Guan, M., Hahn, S., & Iwasa, Y. (2017). Test of an 8.66-T REBCO Insert Coil with Overbanding Radial Build for a 1.3-GHz LTS/HTS NMR Magnet. Ieee Transactions On Applied Superconductivity : A Publication Of The Ieee Superconductivity Committee. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_28827976