Effect of interturn spacing on AC loss of single layer Bi-2223/Ag coils

Author

Polak, Marcin ; Jansak, L. ; Kvitkovic, J. ; Usak, P. ; Paasi, J. ; Lehtonen, J. ; Daumling, M. ; Kasztler, A. ; Kirchmayr, H.

Author_Institution

Inst. of Electr. Eng., Slovak Acad. of Sci., Bratislava, Slovakia

Volume

10

Issue

1

fYear

2000

fDate

3/1/2000 12:00:00 AM

Firstpage

673

Lastpage

676

Abstract

We studied effects of interturn spacing on AC losses and DC critical currents of single layer R&W coils wound from multifilamentary, untwisted Bi-2223/Ag tape. The losses at currents below the critical current increased proportional to i=(I/sub 0//I/sub c/)/sup n/, where n values were 3.6, 3.3, and 3 for coils with interturn gap 4 mm, 1 mm and 0.1 mm, respectively. At currents below I/sub c/ AC losses increased with decreasing interturn gap. We suppose that the observed loss increase is caused by the increase of magnetization losses, while self-field losses remain practically unchanged.

Keywords

bismuth compounds; calcium compounds; critical currents; high-temperature superconductors; losses; multifilamentary superconductors; silver; strontium compounds; superconducting coils; superconducting tapes; AC loss; Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O-Ag; DC critical current; interturn spacing; magnetization loss; multifilamentary Bi-2223/Ag tape; self-field loss; single layer R&W coil; Coils; Cooling; Critical current; Current measurement; Heating; Loss measurement; Magnetic fields; Physics; Voltage; Wounds;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.828323

Filename

828323