Detection of ´hot spots´ in HTS coils and test samples with acoustic emission signals

Author

Lee, Haigun ; Kim, Ho Min ; Jankowski, Joseph ; Iwasa, Yukikazu

Author_Institution

MIT Francis Bitter Magnet Lab., Cambridge, MA, USA

Volume

14

Issue

2

fYear

2004

fDate

6/1/2004 12:00:00 AM

Firstpage

1298

Lastpage

1301

Abstract

In this paper we report results of two series of experiments, one performed on a double-pancake coil wound with Bi2223/Ag tape and the other on coated YBCO samples to demonstrate that an acoustic emission (AE) technique is a promising diagnostic tool to detect the presence of a "hot spot" in HTS devices. The AE technique may be used as complement to standard voltage technique to facilitate early detection of the presence of a "hot spot" in HTS devices and thus help to protect the HTS devices from permanent damage.

Keywords

acoustic emission testing; barium compounds; bismuth compounds; calcium compounds; failure analysis; high-temperature superconductors; lead compounds; strontium compounds; superconducting coils; superconducting tapes; yttrium compounds; (BiPb)₂Sr₂Ca₂Cu₃O₁₀-Ag; Bi2223/Ag tape; HTS coils; HTS devices; YBa₂Cu₃O₇; acoustic emission signals; acoustic emission technique; coated YBCO conductors; diagnostic tool; double-pancake coil; hot spot detection; permanent damage; test samples; voltage technique; Acoustic emission; Acoustic signal detection; Acoustic testing; Coils; Data acquisition; Heating; High temperature superconductors; Signal generators; Superconducting magnets; Thermal stresses; /Ag coil; AE; Acoustic emission; Bi222; YBCO coated conductor; detection of “hot spot” in superconductors; protection;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2004.830559

Filename

1325037