Persistent current HTS magnet cooled by cryocooler (2) - magnet configuration and persistent current operation test

Author

Kusada, Shigehisa ; Igarashi, Motohiro ; Kuwano, Katsuyuki ; Nemoto, Kaoru ; Hirano, Satoshi ; Okutomi, Takeshi ; Terai, Motoaki ; Kuriyama, Toru ; Tasaki, Kenji ; Tosaka, Taizo ; Marukawa, Kotaro ; Hanai, Satoshi ; Yamashita, Tomohisa ; Yanase, Yasuto ;

Author_Institution

Central Japan Railway Co., Tokyo, Japan

Volume

15

Issue

2

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

2285

Lastpage

2288

Abstract

An high temperature superconducting (HTS) magnet, consisting of an HTS coil, a persistent current switch, a GM type two-stage pulse tube cryocooler, and YBCO current leads was developed. Detachable current leads were adopted to reduce heat leakage during persistent current operation. The HTS coil was cooled to approximately 10 K and persistent current mode operation tests were carried out at various currents up to 532 A, which is the rated current. Current decay at each persistent current mode operation was investigated by measuring the magnetic field at the center of the coil. The current decay rate at the 532 A operation was found to be approximately 0.44%/day.

Keywords

bismuth compounds; calcium compounds; cryogenics; high-temperature superconductors; lead compounds; magnetic cooling; magnetic fields; persistent currents; strontium compounds; superconducting coils; superconducting magnets; superconducting tapes; 10 K; 532 A; Bi2223 tapes; Bi₂PdSr₂Ca₂Cu₃O₁₀; HTS coil; HTS racetrack coil; I-V characteristics; YBCO current leads; current decay; detachable current leads; heat leakage; high temperature superconducting magnet; low electrical field; magnet configuration; magnetic field; persistent current HTS magnet; persistent current operation test; persistent current switch; pulse tube cryocooler; Current measurement; High temperature superconductors; Magnetic field measurement; Magnetic switching; Persistent currents; Superconducting coils; Superconducting magnets; Switches; Testing; Yttrium barium copper oxide; Bi2223 tapes; HTS racetrack coil; I-V characteristics; low electrical field;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2005.849632

Filename

1440122