Title :
Results of AC loss tests on twisted and untwisted HTSC tape exposed to external field
Author :
Hardono, Tri ; Cook, Christopher D. ; Darmann, Frank
Author_Institution :
Wollongong Univ., NSW, Australia
fDate :
3/1/2001 12:00:00 AM
Abstract :
This paper presents the results of magnetic loss tests on twisted and untwisted 37 multifilament tapes exposed to an alternating field at power frequencies. The losses are measured using calorimetric methods, which are capable of measuring losses in short tapes with the accuracy of several microwatts per centimeter of tape. The losses of the tape due to the longitudinal field of the untwisted tape agree well with theoretical calculations. The measurement results on the twisted filament tape, with 50-mm twist pitch, show that the losses are slightly lower than that in the untwisted tape. This is due to the reduction of the coupling losses between the filaments in the tape. It is also shown that in this presence of normal fields, the losses are about one order higher than for longitudinal fields because of the anisotropic properties of the superconducting parts and because of the existence of eddy current loss in the silver sheath
Keywords :
bismuth compounds; cable sheathing; calcium compounds; copper compounds; eddy current losses; high-temperature superconductors; lead compounds; loss measurement; power cable testing; silver; strontium compounds; superconducting cables; superconducting tapes; (BiPb)2Sr2Ca2Cu3O 10-Ag; (BiPb)2Sr2Ca2Cu3O 10-Ag HTSC tape; 50 mm; AC loss tests; anisotropic properties; calorimetric methods; eddy current loss; external field exposure; high-Tc superconductors; magnetic loss tests; multifilament tapes; silver sheath; twisted tape; untwisted tape; Anisotropic magnetoresistance; Frequency; Loss measurement; Magnetic anisotropy; Magnetic field measurement; Magnetic losses; Multifilamentary superconductors; Perpendicular magnetic anisotropy; Superconducting magnets; Testing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
