Title :
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
fDate :
6/1/2004 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2004.830559
