Magnetic Field Quality Evaluation of a 20-T Cryogen-Free Superconducting Magnet with a Bi2223 Insert

Satoshi Awaji; Hidetoshi Oguro; Kazuo Watanabe

doi:10.1109/TASC.2016.2535974

Magnetic Field Quality Evaluation of a 20-T Cryogen-Free Superconducting Magnet with a Bi2223 Insert

Satoshi Awaji, Hidetoshi Oguro, Kazuo Watanabe

High Field Laboratory for Superconducting Materials

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

The magnetic field stability such as relaxation and a magnetic field hysteresis of a practical 20-T cryogen-free superconducting magnet (20 T-CSM) with a Bi₂Sr₂Ca₂Cu₃O_y (Bi2223) insert coil was investigated. The relaxation of a central magnetic field is basically related to the flux creep phenomena in the magnetization of the Bi2223 tapes. We found that the relaxation rate $S$ of the magnet is more than two orders smaller than that of the Bi2223 tapes. The magnetic field stability of the 20 T-CSM becomes less than 2 G/h even at 19 T after a lapse of half a day from the charging. It is small enough for the solid-state NMR studies. However, the repeating excitation increases the central magnetic field beyond the saturated values under the relaxation.

Original language	English
Article number	7422034
Journal	IEEE Transactions on Applied Superconductivity
Volume	26
Issue number	4
DOIs	https://doi.org/10.1109/TASC.2016.2535974
Publication status	Published - 2016 Jun

Keywords

BiSrCaCuO tape
High magnetic field
High temperature superconductor
Magnetization
Relaxation
Superconducting magnet

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/TASC.2016.2535974

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title = "Magnetic Field Quality Evaluation of a 20-T Cryogen-Free Superconducting Magnet with a Bi2223 Insert",

abstract = "The magnetic field stability such as relaxation and a magnetic field hysteresis of a practical 20-T cryogen-free superconducting magnet (20 T-CSM) with a Bi2Sr2Ca2Cu3Oy (Bi2223) insert coil was investigated. The relaxation of a central magnetic field is basically related to the flux creep phenomena in the magnetization of the Bi2223 tapes. We found that the relaxation rate $S$ of the magnet is more than two orders smaller than that of the Bi2223 tapes. The magnetic field stability of the 20 T-CSM becomes less than 2 G/h even at 19 T after a lapse of half a day from the charging. It is small enough for the solid-state NMR studies. However, the repeating excitation increases the central magnetic field beyond the saturated values under the relaxation.",

keywords = "BiSrCaCuO tape, High magnetic field, High temperature superconductor, Magnetization, Relaxation, Superconducting magnet",

author = "Satoshi Awaji and Hidetoshi Oguro and Kazuo Watanabe",

note = "Funding Information: This work was supported in part by JSPS under Grants-in-Aid for Scientific Research KAKENHI 25246032. Publisher Copyright: {\textcopyright} 2016 IEEE.",

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AU - Oguro, Hidetoshi

AU - Watanabe, Kazuo

PY - 2016/6

Y1 - 2016/6

N2 - The magnetic field stability such as relaxation and a magnetic field hysteresis of a practical 20-T cryogen-free superconducting magnet (20 T-CSM) with a Bi2Sr2Ca2Cu3Oy (Bi2223) insert coil was investigated. The relaxation of a central magnetic field is basically related to the flux creep phenomena in the magnetization of the Bi2223 tapes. We found that the relaxation rate $S$ of the magnet is more than two orders smaller than that of the Bi2223 tapes. The magnetic field stability of the 20 T-CSM becomes less than 2 G/h even at 19 T after a lapse of half a day from the charging. It is small enough for the solid-state NMR studies. However, the repeating excitation increases the central magnetic field beyond the saturated values under the relaxation.

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Magnetic Field Quality Evaluation of a 20-T Cryogen-Free Superconducting Magnet with a Bi2223 Insert

Abstract

Keywords

ASJC Scopus subject areas

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