Losses of Aluminum-Stabilized Superconducting Conductors for Large Helical Device

F. Sumiyoshi, Y. Kanai, T. Kawashima, Masataka Iwakuma, T. Mito, K. Takahata, N. Yanagi, J. Yamamoto

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We investigate an optimum design of aluminum-stabilized superconducting conductors used for the helical coil system of the Large Helical Device (LHD) project from the low loss point of view. A short sample conductor of about 50 cm long is used in our experiment. The loss measuring system we originally fabricated is mainly composed of a superconducting split magnet of a race-track type and a superconducting transformer. The data of the ac loss observed in the frequency range from 0.1 Hz to 120 Hz show the existence of two peaks just as our analysis predicted. The peak at the lower frequency is the critical frequency of the inter-strand coupling time constant Tc: The other peak at the higher frequency is the skin frequency of the normal metal around the strand bundle in the conductor. At the practical condition of the LHD corresponding to 0.1 Hz, the loss can be decreased by the increase in Tc.

Original languageEnglish
Pages (from-to)210-213
Number of pages4
JournalIEEE Transactions on Magnetics
Volume28
Issue number1
DOIs
Publication statusPublished - Jan 1 1992

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Aluminum
Superconducting magnets
Skin
Metals
Experiments

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Sumiyoshi, F., Kanai, Y., Kawashima, T., Iwakuma, M., Mito, T., Takahata, K., ... Yamamoto, J. (1992). Losses of Aluminum-Stabilized Superconducting Conductors for Large Helical Device. IEEE Transactions on Magnetics, 28(1), 210-213. https://doi.org/10.1109/20.119847

Losses of Aluminum-Stabilized Superconducting Conductors for Large Helical Device. / Sumiyoshi, F.; Kanai, Y.; Kawashima, T.; Iwakuma, Masataka; Mito, T.; Takahata, K.; Yanagi, N.; Yamamoto, J.

In: IEEE Transactions on Magnetics, Vol. 28, No. 1, 01.01.1992, p. 210-213.

Research output: Contribution to journalArticle

Sumiyoshi, F, Kanai, Y, Kawashima, T, Iwakuma, M, Mito, T, Takahata, K, Yanagi, N & Yamamoto, J 1992, 'Losses of Aluminum-Stabilized Superconducting Conductors for Large Helical Device', IEEE Transactions on Magnetics, vol. 28, no. 1, pp. 210-213. https://doi.org/10.1109/20.119847
Sumiyoshi, F. ; Kanai, Y. ; Kawashima, T. ; Iwakuma, Masataka ; Mito, T. ; Takahata, K. ; Yanagi, N. ; Yamamoto, J. / Losses of Aluminum-Stabilized Superconducting Conductors for Large Helical Device. In: IEEE Transactions on Magnetics. 1992 ; Vol. 28, No. 1. pp. 210-213.
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