Electrical properties of superconducting joint between composite conductors

Author

Tominaka, T. ; Kakugawa, S. ; Hara, N. ; Maki, N.

Author_Institution

Hitachi Ltd., Ibaraki, Japan

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

1846

Lastpage

1849

Abstract

To investigate the electrical properties of the joint between superconducting multifilamentary wires, the authors used a radio-frequency superconducting quantum interference device (RF-SQUID) voltmeter to measure the extremely small voltage induced across the joint. They measured the time variation of both the current induced in a loop of superconducting wire and the voltage induced across the joint. A voltage sensitivity in the picovolt range was obtained with this apparatus. Comparisons of current decay between superconducting loops with soldered, spot-welded and cold-welded joints were made. A flux-creep-like phenomenon was seen in the current decay for the cold-welded and spot-welded joints

Keywords

SQUIDs; composite superconductors; contact resistance; electric resistance measurement; soldering; superconducting magnets; voltage measurement; voltmeters; RF SQUID voltmeter; cold-welded joints; composite conductors; current decay; electrical properties; extremely small voltage; flux-creep-like phenomenon; induced current; induced voltage; joint resistance; loop of superconducting wire; multifilamentary wires; picovolt range; soldered joint; spot-welded joints; superconducting joint; time variation; voltage sensitivity; Current measurement; Electric variables measurement; Multifilamentary superconductors; Radio frequency; Radiofrequency interference; SQUIDs; Superconducting devices; Superconducting filaments and wires; Voltage; Voltmeters;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133555

Filename

133555