CUED Publications database

Mechanism of a high- T<inf>c</inf> superconducting flux pump: Using alternating magnetic field to trigger flux flow

Geng, J and Coombs, TA (2015) Mechanism of a high- T<inf>c</inf> superconducting flux pump: Using alternating magnetic field to trigger flux flow. Applied Physics Letters, 107. ISSN 0003-6951

Full text not available from this repository.

Abstract

© 2015 AIP Publishing LLC. High-T c Superconducting (HTS) magnets operating in persistent current mode suffer a current decay due to flux creep of superconductor and joint resistance. Flux pumps are able to inject direct current into superconducting circuit to compensate the current decay, without the thermal loss caused by current leads. In this work, we proposed a flux pumping mechanism for HTS coils, with an experimental verification and an analytical model. The basic principle we have used is that flux flow can be triggered when the superconductor carrying a direct current is subjected to a perpendicular AC magnetic field. Low frequency alternating current is induced in a loop of YBCO tape using an AC field. A portion of the tape which we refer to as the "bridge" shorts a superconducting coil. A high frequency AC field is applied perpendicular to the bridge tape when alternating current in the tape reaches one polarity. This triggers a net flux flow and results in a current increase in the coil. The proposed flux pump has clear physics and is easily controllable, which may make it promising in practical use.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:29
Last Modified: 07 Sep 2017 01:46
DOI: