Testing of a cryocooler-cooled HTS magnet with silver-sheathed Bi2223 tapes for silicon single-crystal growth applications

Author

Ono, M. ; Tasaki, K. ; Ohotani, Y. ; Kuriyama, T. ; Sumiyoshi, Y. ; Nomura, S. ; Kyoto, M. ; Shimonosono, T. ; Hanai, S. ; Shoujyu, M. ; Ayai, N. ; Kaneko, T. ; Kobayashi, S. ; Hayashi, K. ; Takei, H. ; Sato, K. ; Mizuishi, T. ; Kimura, M. ; Masui, T.

Author_Institution

Toshiba Corp., Yokohama, Japan

Volume

12

Issue

1

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

984

Lastpage

987

Abstract

A project to develop a high-temperature superconducting split magnet for 8 inch silicon single-crystal growth applications began in October 1997. This split coil system is composed of 2 coils, each consisting of 18 pancakes. Each coil has an outer diameter of 1.2 m and a thickness of 0.1 m. Moreover, we developed a highly efficient GM-type cryocooler to cool a HTS coil to below 20 K. This paper presents the test results for a full-scale magnet. Each coil was cooled by the GM-cryocooler with a 3.3 kW compressor. The cool-down of the coil was completed within 480 hours with temperature difference among pancakes maintained at less than 18 K. In April 2001 this split coil was successfully energized up to rated current of 210 A at 20 K without a quench. The stored energy of this split coil reached 1.1 MJ at 216 A, 20 K, and the fastest charging time in our experiments was 1 minute.

Keywords

bismuth compounds; cooling; critical currents; cryogenics; crystal growth from melt; eddy current losses; elemental semiconductors; high-temperature superconductors; magnetic hysteresis; magnetic leakage; semiconductor growth; silicon; silver; superconducting coils; superconducting magnet energy storage; superconducting magnets; superconducting tapes; 1.1 MJ; 20 K; 210 A; 216 A; AC losses; BiSrCaCuO-Ag; HTSC split magnet; Si; critical current; cryocooler-cooled magnet; eddy current losses; full-scale magnet; highly efficient GM-type cryocooler; hysteresis loss; limit temperature; magnetic field density; optimal configuration; pancakes; rated current excitation; silicon single-crystal growth; silver-sheathed Bi2223 tapes; split coil system; stored energy; Collaboration; Critical current; Helium; High temperature superconductors; Manufacturing; Silicon; Superconducting coils; Superconducting magnets; Testing; Wires;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2002.1018565

Filename

1018565