High-field warm-bore HTS conduction cooled magnet

Author

Snitchler, G. ; Kalsi, S.S. ; Manlief, M. ; Schwall, R.E. ; Sidi-Yekhief, A. ; Ige, S. ; Medeiros, R. ; Francavilla, T.L. ; Gubser, D.U.

Author_Institution

American Supercond. Corp., Westborough, MA, USA

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

553

Lastpage

558

Abstract

A 7.25 T laboratory magnet utilizing Bi 2223 conductor has been designed, built, and installed at the Naval Research Laboratory. Operating at 21 K at full field, the coil provides field homogeneity of /spl plusmn/1% in a 2-inch warm-bore. The system is conduction cooled with a pair of Leybold single stage cryocoolers that allow cooldown in less than 36 hours and allow extended fast ramp operation. Operation at a total refrigerator input power of 6 kW is facilitated by the use of ASC Cryosaver/sup TM/ HTS current leads. The fully integrated system consists of the magnet, cryogenic system, control and protection system and power supply. This paper presents information on the magnet design, construction and subsequent testing.

Keywords

bismuth compounds; calcium compounds; cooling; copper compounds; cryogenics; high-temperature superconductors; strontium compounds; superconducting magnets; 2 in; 21 K; 6 kW; 7.25 T; ASC Cryosaver/sup TM/ HTS current leads; Bi 2223 conductor; Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O; Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O HTSC; Leybold single stage cryocoolers; construction; design; extended fast ramp operation; field homogeneity; high-field warm-bore HTS conduction cooled magnet; testing; Bismuth; Coils; Conductors; Control systems; Cryogenics; High temperature superconductors; Laboratories; Power supplies; Power system protection; Refrigeration;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.783356

Filename

783356