AE spectra during super-to-normal transition in a superconducting rotor

H. Nomura, K. Kaiho, I. Ishii, N. Higuchi, S. Fuchino, H. Tateishi, S. Sekine, K. Arai, N. Natori, Kazuhiro Kajikawa, H. Yamaguchi, N. Tamada

Research output: Contribution to journalArticlepeer-review

Abstract

We discovered new quantitative relations regarding AE spectra and super-to-normal transition in a rotating superconducting machine. Hence, we have reported mainly qualitative evaluation of AE from the rotating superconducting machine, such as AE and super-to-normal transition, AE and normal propagation, AE and quench magnitude, AE versus heat and changes in magnetic flux, and a prediction of the area to a certain point [H. Nomura et al. Ultrasonics 34 (1996) 307-309]. By repeating the experiments, interesting quantitative relations were found in the AE spectrum's main frequency which shifts, according to changes in the magnetic field, the rotational speed and the transport current. Furthermore, these shifts can be explained using simple arithmetic. These discoveries will be useful for both evaluating and monitoring the superconducting rotor.

Original languageEnglish
Pages (from-to)549-552
Number of pages4
JournalUltrasonics
Volume36
Issue number1-5
DOIs
Publication statusPublished - Jan 1 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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