Self-field AC losses and critical currents in multi-tube Ag - Bi-2223 conductors

Ciszek, M.; Ashworth, S.P.; James, M.; Glowacki, B.A.; Campbell, A.M.; Garrè, R.; Conti, S.

doi:10.1088/0953-2048/9/5/008

Cited by 40 publications

(15 citation statements)

References 28 publications

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“…This experiment allows access to a wide frequency domain and is well suited for investigating the coupling loss. Another type of data is obtained with standard transport ac loss measurements in the self-field, as described in, e.g., [14]. Figure 2 shows a cross-sectional view of a Cu/ Ag composite sheathed tape, a typical result obtained by the first method (see Fig.…”

Section: Methodsmentioning

confidence: 99%

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Huang

Dhallé

Witz

et al. 1998

Journal of Superconductivity: Incorporating Novel Magnetism

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A significant reduction of ac losses in twisted Bi(2223) multifilamentary tapes with Ag sheaths has been achieved by using oxide (BaZrO3 and SrZrO3) barriers between filaments. These barriers have two important effects: they increase the transverse resistivity, which suppresses induced coupling currents, and they reduce filament bridging, which in pure Ag sheath tapes largely cancels the beneficial effect of filament twisting. The decoupling can be gauged by the frequency at which loss shows a maximum in a low-amplitude ac field applied perpendicular to the tape. So far, the frequency of the loss maximum,fm , in Ag-sheathed tapes has been enhanced from 5 Hz (untwisted) to 82 Hz (11 mm in twist pitch length). Different ways to introduce oxide barriers in tapes with 19-95 filaments are presented. The critical current density in the filaments varied between 10,000 and 20,000 A/cm2. Ac loss measurements as well as the electrical and mechanical characterization are discussed in detail. The variation of the critical current density with bending strain is shown to be similar to that of tapes without barriers.

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Section: Methodsmentioning

confidence: 99%

Untitled

Huang

Dhallé

Witz

et al. 1998

Journal of Superconductivity: Incorporating Novel Magnetism

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“…Previously, measurement of the power loss in Bi-2223 HTS tapes has focused on low frequency applications below 600 Hz [13][14][15] instead of the typical 1-2 kHz at which gradient coils work.…”

Section: Self-field Ac Power Loss In Bi-2223 Tapementioning

confidence: 99%

Investigation of Bi-2223 high temperature superconducting tape as the material for gradient coil in MRI

Yuan

Rohan

Shen

2006

Journal of Magnetic Resonance

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“…In this paper, we report the results of critical current measurements and AC loss simulation of a series of BSCCO tapes using the Norris equation with different twist-pitch (8,10,13,30,50, 70 mm and ∞). Experimental AC loss measurements were further performed on three selected tapes with twist pitch of 10, 13, and 70 mm.…”

Section: Introductionmentioning

confidence: 99%

Transport AC losses of Ag-sheathed Bi-2223 tapes with different twist-pitch using electrical methods

Jang¹,

Wong‐Ng²

2005

Supercond. Sci. Technol.

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A series of Bi-2223 ([Bi, Pb]:Sr:Ca:Cu:O = 2:2:2:3) tapes with 37 superconducting core filaments was investigated in an attempt to correlate critical current and alternating current (AC) losses with twist-pitch. The twist-pitch of these multi-filamentary tapes which were produced by the powder-in-(Ag)tube (PIT) method varies from 8, 10, 13, 30, 50, 70 mm to ∞ mm (non-twist). Critical current (I c) measurements which were conducted in zero field by a four-probe method under liquid-nitrogen temperature showed that I c is greater in the non-twist filament than that in twisted filaments. Among these tapes, three (twist-pitch of 10, 13, and 70 mm) were selected for AC loss experiments under a time-varying transport current. The results of AC loss measurements in general agree with that of the AC loss simulation using the ellipse model of the Norris equation. Simulation results show that the hysteretic AC loss is lowest in the non-twist tape and increases as the twist-pitch decreases. A much greater loss was found in tapes with small twist-pitch, i.e. 10 and 8 mm. Among different possible loss contributions to the total AC losses, the hysteretic loss was determined to be the main source. In addition, microstructural damage of tapes with small twist-pitch appears to contribute to the overall AC losses as well.

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Self-field AC losses and critical currents in multi-tube Ag - Bi-2223 conductors

Cited by 40 publications

References 28 publications

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Investigation of Bi-2223 high temperature superconducting tape as the material for gradient coil in MRI

Transport AC losses of Ag-sheathed Bi-2223 tapes with different twist-pitch using electrical methods

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