Advances in Cryogenic Engineering Materials pp 723-730 | Cite as
Transport Current AC Losses of High-Tc Superconducting Tapes Exposed to AC Magnetic Field
Abstract
A new measurement method is developed to properly measure transport current AC losses of high-Tc superconducting tapes which are subject to external magnetic field generated by adjacent tapes in multiple tapes assembled conductor. It has been pointed out that to correctly measure the AC losses of the tape, the voltage measurement loop should include the magnetic flux over a distance much larger than the tape width. However, this wide voltage loop needs wide space and picks up spurious loss caused by adjacent tapes when multiple tapes are assembled. In our arrangement, the leads from voltage taps on the tape are wound on a cylindrical surface enclosing the tape. This method can save space for voltage leads and avoid spurious loss component caused by the magnetic field of the other tape. In the paper, details of our measurement arrangement are explained and the validity of our method is investigated by theoretical and numerical analyses and an experiment. It is demonstrated that our method is effective.
Keywords
Voltage Loop Tape Width Loop Arrangement Spiral Loop Multiple TapePreview
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Reference
- 1.M.Ciszek, A.M.Campbell and B.A.Glowacki. The effect of potential contact position on AC loss measurements in superconducting BSCCO tape, Physica C233: 203 (1994).Google Scholar
- 2.H.Ishii, S.Hirano, T.Hara, J.Fujikami and K.Sato. The a.c. losses in (Bi,Pb)2Sr2Ca2Cu3Ox silver-sheathed superconducting wires, Cryogenics 36: 697 (1996).CrossRefGoogle Scholar
- 3.T.Fukunaga, S.Maruyama and A.Oota. AC losses of Ag-sheathed Bi-2223 superconducting wires, Advances in Superconductivity VI, 633, (1994).Google Scholar
- 4.S.Flesher et al. Measurement of the ac power loss of (Bi,Pb)2Sr2Ca2Cu,O, composite tapes using the transport technique, Appl. Phys. Lett. 67: 3189 (1995).Google Scholar
- 5.W.T.Norris. Calculation of hysteresis losses in hard superconductors carrying ac: isolated conductors and edges of thin sheets, J Phys D3: 489, (1970)ADSGoogle Scholar
- 6.S.Fukui, O.Tsukamoto, N.Amemiya, K.Miyashita andM.Hakamata. AC losses of AC superconducting cable due to transport current in external AC magnetic field, Presented at Applied Superconductivity Confference 1996, To be published in IEEE transactions on Applied Superconductivity.Google Scholar