Effects of spatially limited external magnetic fields on short sample tests of large-scale superconductors

Author

Mito, Toshiyuki ; Yanagi, Nagato ; Takahata, Kazuya ; Iwamoto, Akifumi ; Satow, Takashi ; Yamamoto, Junya ; Hirano, Naoki

Author_Institution

Nat. Inst. for Fusion Sci., Gifu, Japan

Volume

32

Issue

4

fYear

1996

fDate

7/1/1996 12:00:00 AM

Firstpage

2418

Lastpage

2421

Abstract

For short sample tests of large-scale superconductor coil conductors, it is difficult to get sufficient spatial uniformity using external magnetic fields because of the size limitations of test facilities. The effects of spatially limited external magnetic fields on short sample tests are discussed by comparing the test results for narrow and broad external magnetic fields. The authors tested short samples of pool-cooled 10 kA class superconductors using two kinds of split coils which are different in bore size. The measured recovery currents for the narrow external field are more than twice those for the broad field. It shows that the insufficient spatial distribution of the external field biases the stability measurements of superconductors

Keywords

magnetic fields; power cable testing; stability; superconducting cables; superconducting coils; superconducting materials; 10 kA; bore size; broad external field; external magnetic fields; large-scale superconductor coil conductors; narrow external field; recovery currents; split coils; stability measurements; test facilities; Boring; Conductors; Current measurement; Large-scale systems; Magnetic field measurement; Magnetic fields; Stability; Superconducting coils; Test facilities; Testing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.511361

Filename

511361