The critical current in a NbTi tape measured in different directions of magnetic field and the current reduction due to the self field

Haken, Bernard ten; Klundert, L.J.M. van de; Vysotsky, V.S.; Karasik, V.R.

doi:10.1109/20.119989

Cited by 13 publications

(4 citation statements)

References 2 publications

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“…For the sake of comprehensiveness, the plot in figure 2 is completed with the results achieved assuming an isotropic j c (B), i.e. with k = 1, and j c0 was increased to 4.516×10 8 A m −2 in order to maintain Figure 2. Critical currents determined from the distributions calculated for a range of magnetic fields.…”

Section: Calculation Of the Current Distributionmentioning

confidence: 99%

“…Calculation of the magnetic field distribution in the critical state with the magnetic-field-dependent critical current density is far from straightforward. For some geometries, simplified computations have provided an explanation of such self-field related phenomena as the saturation of critical current at low fields [8,9] and the apparent critical current degradation of a stacked conductor [10]. Consideration of self-field effects with the help of simplified calculation procedures allowed us to explain the behaviour of cable-in-conduit or multistrand conductors from the low-T c superconductor NbTi [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Self-field critical current of a conductor with an elliptical cross-section

Gömöry

Klinčok

2006

Supercond. Sci. Technol.

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Numerical calculations using the commercial finite-element code FEMLAB have been carried out to find the distribution of current density in a wire of elliptical cross-section from a hard superconductor carrying the critical current. Dependence of the critical current density on local magnetic field and its orientation has been taken into consideration in these calculations. The results of critical current calculations for wires of different shapes and dimensions clearly revealed how this quantity can be influenced by the distribution of the self magnetic field. The outcome found for wires with cross-sections resembling tapes made from a high-temperature superconductor Bi-2223 have been approximated by two engineering formulae: one can be used to cancel out the influence of the tape width, and the other allows us to perform a correction on the aspect ratio. These expressions would allow the quality of superconducting properties expressed by the self-field critical current density to be compared also for wires of different cross-sections.

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Section: Calculation Of the Current Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-field critical current of a conductor with an elliptical cross-section

Gömöry

Klinčok

2006

Supercond. Sci. Technol.

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“…The characteristics of the tape have been described in reference [2]. The tape was soldered to a stainless steel substrate, using Pb -Sn solder.…”

Section: A Nb-ti Tapesmentioning

confidence: 99%

Electrical and thermal behavior of patterned superconducting disks

Bromberg

Sidorov

Mint︠s︡

et al. 1995

IEEE Trans. Appl. Supercond.

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Mri ngAbstmct -An apparatus for the investigation of low and high-Tc superconducting spirals has been designed and built. The device is capable of measuring t h e chcaracteristic of superconducting spirals. The superconductor spirals are on a normally conducting substrate. The normally conducting substrate serves as a shunt between the superconducting turns, serving as a distributed quench protection resistor. Samples with both high and low electrical resistance substrates have been tested on this apparatus. Preliminary results of the tests of both high-T, (Bi -Sr -C a -C u -0) and low-T, (Nb -Ti) thick-film spirals have been investigated. Current distribution in films during quench has been studied experimentally. Generation of normal zone and hysteresis current-voltage characteristics have been discovered in high-Tc superconducting spirals on silver plate. It is shown that frequency of generation of normal zone depends at under certain conditions (transient current, m netic field, temperature and resistivity of substrate). %e results are being analyzed with models.

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“…Studies of field orientation effects for NbTi and Nb 3 Sn wires were investigated [4], [5]. The critical currents of Nb 3 Sn increased by a factor of two with the longitudinal field at high magnetic fields [6].…”

Section: Introductionmentioning

confidence: 99%