Influences of winding pitch on transverse-field loss of multifilamentary wire measured by a simple electromagnetic method with configuration of a double-layer non-inductive sample coil
✍ Scribed by Kazuhiro Kajikawa; Hideaki Shiraishi; Atsushi Takenaka; Masataka Iwakuma; Kazuo Funaki
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 819 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
We have proposed a simple electromagnetic method of ac loss measurements for superconducting wires in various types of electromagnetic environments. So far, the samples were closely wound as a double-layer non-inductive coil. In this study, we prepare some sample coils of NbTi multi®lamentary wire with dierent winding pitches, and measure the ac losses in a transverse magnetic ®eld by the simple electromagnetic method. We evaluate the in¯uences of winding pitch in the sample coils on the transverse-®eld losses in comparison with those by a conventional pickup-coil method and theoretical prediction. We have an experimental result that the simple electromagnetic method is useful to measure the transverse-®eld loss even for loose windings with a turn-to-turn spacer. Taking into account a demagnetization eect, we also obtain a conclusion that the ac losses can be plotted on a master curve for the maximum level of local magnetic ®eld applied to sample wire.