NDLI: Evaluation of the Screening Current in a 1.3 GHz NMR Magnet Using ReBCO

Content Provider	IEEE Xplore Digital Library
Author	Otsuka, A. Yanagisawa, Y. Kiyoshi, T. Maeda, H. Nakagome, H. Takeda, M.
Copyright Year	2002
Abstract	NMR magnets using high-T_c superconductors (HTS) are currently by several organizations designed to generate high fields exceeding 25 T. In such designs, the HTS are used for the inner coils, and the outer coils consist of NbTi and Nb₃Sn wires. A ReBCO wire with a Hastelloy substrate has excellent critical current performance over wide range of magnetic fields and tolerates high tensile stress up to 700 MPa. We have previously shown conceptual designs in which the main coils are assumed to use ReBCO wires. The designs suggest the potential to realize much more compact and lightweight magnets than conventional magnets with low-T_c superconductors (LTS) and HTS. On the other hand, the problem of screening current induced by the perpendicular field remains to be solved. In this study, we evaluate numerically the amount of the magnetic field generated by the screening current in ReBCO coils. Compensation coils for improving field homogeneity were found to reduce the shielding current by several percentage points. The improved coil arrangement is reported considering the shielding current effect.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2076
Ending Page	2079
Page Count	4
File Size	340240
File Format	PDF
ISSN	10518223
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Magnetomechanical effects Superconducting magnets Nuclear magnetic resonance Saturation magnetization Magnetic shielding Magnetic noise screening current Hoop stress HTS NMR magnet ReBCO
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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