Consideration on Contact Mechanism of YBaCuO Bulk Superconductor with Deposited Metal Layer

Hiroyuki FUJITA  Katsuya FUKUDA  Koichiro SAWA  Masaru TOMITA  Masato MURAKAMI  Naomichi SAKAI  Izumi HIRABAYASHI  

IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.7   pp.1421-1428
Publication Date: 2007/07/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.7.1421
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electromechanical Devices (Selected Papers from ICEC2006))
Category: Contact Phenomena
YBCO,  persistent current switch,  contact resistance,  metal deposition,  finite element method,  

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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 study, the authors have successfully reduced a residual resistance by depositing with metal on contact surface. This paper focused on a current carrying area (called a-spot) on contact surface and presented an effect of deposited metal on electrical contact characteristics in order to clear the contact mechanism. As the results of experiments and simulation using FEM, it became clear that it was effective for reducing the residual resistance from a view point of increasing the a-spot by depositing with metal.