A study on quenching characteristics of YBaCuO bulk superconductor with deposited Ag layer

Katsuya Fukuda, Hiroyuki Fujita, Koichiro Sawa, Masaru Tomita, Masato Murakami, Naomichi Sakai, Izumi Hirabayashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A persistent current switch (PCS) is used for superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of Y-Ba-Cu-O (YBCO) bulk as a mechanical PCS. In previous reports, in order to investigate the contact characteristics of the switch, 50A current test was performed and the contact resistance between two contacts was measured by four terminal method. As a result, it became clear that polishing and metal depositing on contact surfaces was effective methods to reduce the residual resistance, and the authors achieved to reduce this resistance to 0.64μΩ, which was less than our target value of 1μΩ. This paper focused on the greater current test (above 50A) in order to perform more practical experiment as PCS used for SMES. In this experiment, the authors examined the characteristics to normal conductive state in the YBCO, which was not obtained by former 50A current test. As a result, the transfer current is found to have a relationship with the layer thickness of deposited Ag on contact surfaces. The value of transfer current was rose by increasing the layer thickness of deposited silver, but saturated at around 0.60μm.

Original languageEnglish
Title of host publicationElectrical Contacts 2007
Subtitle of host publicationProceedings of the 53rd IEEE Holm Conference on Electrical Contacts
Pages76-81
Number of pages6
DOIs
Publication statusPublished - 2007 Dec 1
Event53rd IEEE Holm Conference on Electrical Contacts, Holm 2007 - Pittsburgh, PA, United States
Duration: 2007 Sep 162007 Sep 19

Publication series

NameElectrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts
ISSN (Print)0361-4395

Conference

Conference53rd IEEE Holm Conference on Electrical Contacts, Holm 2007
CountryUnited States
CityPittsburgh, PA
Period07/9/1607/9/19

Keywords

  • Contact resistance
  • Metal deposition
  • Persistent current switch
  • Quenching
  • YBCO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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