Residual Magnetic Field Measurement of BSCCO and YBCO Tapes by a Hall Probe

Tallouli, Mohamed; Sun, Jwo‐Shiun; Shyshkin, Oleg; Ninomia, Akira; Hamabe, M.; Watanabe, Hirofumi; Chikumoto, N.; Kaddour, Samia Charfi; Yamaguchi, S.

doi:10.1109/tasc.2014.2372632

Cited by 10 publications

(4 citation statements)

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“…Others have used Hall probes to measure the field distribution across HTS conductors. For example, Tallouli and coworkers 11 , 12 , and references therein measured the perpendicular field profile over (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O 10 and YBa 2 Cu 3 O y tapes and deconvolved this (“the inverse problem”) to infer the differing current profiles for fast and slow transient excitation.…”

Section: Introductionmentioning

confidence: 99%

The onset of dissipation in high-temperature superconductors: magnetic hysteresis and field dependence

Talantsev

Strickland

Wimbush

et al. 2018

Sci Rep

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Recently, we showed that the self-field transport critical current, Ic(sf), of a superconducting wire can be defined in a more fundamental way than the conventional (and arbitrary) electric field criterion, Ec = 1 μV/cm. We defined Ic(sf) as the threshold current, Ic,B, at which the perpendicular component of the local magnetic flux density, B⊥, measured at any point on the surface of a high-temperature superconducting tape abruptly crosses over from a non-linear to a linear dependence with increasing transport current. This effect results from the current distribution across the tape width progressively transitioning from non-uniform to uniform. The completion of this progressive transition was found to be singular. It coincides with the first discernible onset of dissipation and immediately precedes the formation of a measureable electric field. Here, we show that the same Ic,B definition of critical currents applies in the presence of an external applied magnetic field, Ba. In all experimental data presented here Ic,B is found to be significantly (10–30%) lower than Ic,E determined by the common electric field criterion of Ec = 1 µV/cm, and Ec to be up to 50 times lower at Ic,B than at Ic,E.

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Section: Introductionmentioning

confidence: 99%

The onset of dissipation in high-temperature superconductors: magnetic hysteresis and field dependence

Talantsev

Strickland

Wimbush

et al. 2018

Sci Rep

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“…This indicates that there was a residual current inside the HTS tape. According to the data from the Hall sensors, the magnetic field profile was not always uniform across the tape [10]. If the nonuniformity is not small, the residual magnetic field may be large and the system becomes unsuitable for use on a plane.…”

Section: Critical Current and Hysteresis Of The Stacked Conductormentioning

confidence: 99%

A proposal for a lightweight, large current superconducting cable for aviation

Yamaguchi

Kanda

2020

Supercond. Sci. Technol.

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More Electric Aircraft (MEA) is one of the most important subjects for designing the next generation of aircraft. Since we cannot ground the electric power systems of a flying aircraft and the air insulation voltage is lower at high altitude, a low voltage, direct current (DC) aircraft electrical system is preferable for a MEA. Since the current must be high to supply high power, we consider high temperature superconducting (HTS) technology because it handles large currents well. We propose a new HTS cable in this paper. The cable uses a stacked conductor, with oppositely directed current in each HTS tape, a structure that has already been shown to be feasible for low voltage cables. It enhances the critical current compared to a single tape conductor, especially for Bi2223 tape. In order to avoid a current imbalance in the stacked conductor, we use the current lead resistance rather than a Roebel conductor design. Then the critical current remains high, and this is confirmed by measurements. The cryogenic pipe will be made of magnesium-lithium alloy, one of the lightest metals available at the present time. We estimate the weight-to-current ratio per unit length to be less than 0.5 kg/A/km at the liquid nitrogen operational temperature of 77 K, lighter than conventional copper cable. If instead we use liquid hydrogen at 20 K, we expect a value less than 0.1 kg/A/km, which is one of the lowest presently achievable values and satisfies the requirements for MEA.

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“…The corresponding current density profiles are obtained by solving an inverse problem from the measured magnetic field [11,12]. We solve the inverse problem on the assumption that the current density is uniformly distributed along the tape thickness because of high aspect ratio of width to thickness, 12 mm / 0.001 mm = 12000 and also along the tape length as shown observed magnetic field profiles at three different x-direction positions.…”

Section: Current Density Profiles By An Inverse Solutionmentioning

confidence: 99%

“…We solve the inverse problem on the assumption that the current density is uniformly distributed along the tape thickness because of high aspect ratio of width to thickness, 12 mm / 0.001 mm = 12000 and also along the tape length as shown observed magnetic field profiles at three different x-direction positions. The calculation method is described in detail in [11]. Briefly, the measured magnetic field at a constant height above the conductor's surface can be obtained as Equation (1) by Biot-Savart law.…”

Section: Current Density Profiles By An Inverse Solutionmentioning

confidence: 99%