AC loss measurements with a cryocooled system

Author

Schwenterly, S.W. ; Demko, J.A. ; Lue, J.W. ; Walker, M.S. ; Hazelton, Drew W. ; Shi, Xinzhi ; Gardner, M.T.

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

2635

Abstract

Summary form only given, as follows. A new cryostat cooled by a closed-style Cryomech GB-37 cryocooler for superconductor measurements at temperatures down to 20 K is described. The sample is conductively coupled to the cold stage so as to minimize vibration and thermal stresses. AC losses have been measured calorimetrically in several HTSC coils that have been wound to simulate sub-scale transformer winding pairs. Stable temperatures down to 20 K were reached on these coils, allowing measurements at practical levels of AC current and Ic. By using short AC current pulses, losses on individual turns could be resolved. Results are reported mainly to showcase the apparatus, measurement procedure and analytical approach

Keywords

cooling; cryostats; high-temperature superconductors; loss measurement; superconducting coils; superconducting magnets; transformer testing; transformer windings; 20 K; AC loss measurements; HTSC; closed-style Cryomech GB-37 cryocooler; cryocooled system; individual turn losses; short AC current pulses; sub-scale transformer winding pairs; superconducting coils; superconductor measurements; thermal stresses; vibration;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.920409

Filename

920409