The Effectiveness of Pulsed-Field Magnetization with Respect to Different Performance Bulk Superconductors

Deng, Zigang; Miki, M.; Felder, B.; Tsuzuki, K.; Shinohara, Nobuyuki; Taguchi, Ryo; Suzuki, Kenji; Izumi, Mitsuru

doi:10.1007/s10948-011-1211-8

Cited by 10 publications

(4 citation statements)

References 23 publications

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“…The n-value (the exponent in the power-law approximation of the voltage-current curves), which is also closely connected with the pinning properties of HTS materials, has been shown to be just as important in [19]: lower n-values lead to a higher temperature rise during PFM. As for the pulse parameters, the multi-pulse techniques (with constant or alternating amplitude) have shown their advantage over the single-pulse method [16,[20][21][22][23][24][25][26]. If such pulses are combined with the corresponding temperature regime (meaning, each pulse is applied at a specific temperature), even higher results can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Thermal behavior of ﬂux jumps and inﬂuence of pulse-shape on the trapped ﬁeld during pulsed magnetization of a high-temperature superconductor

Moroz¹,

Kashurnikov²,

Rudnev³

et al. 2021

J. Phys.: Condens. Matter

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The impact of temperature on the pulsed magnetization of a high-temperature superconductor (HTS) has been numerically studied. The resulting trapped field (TF) and its distribution over the HTS have been calculated for samples with random and periodic pinning (a regular triangular lattice). The increasing ambient temperature (within the considered values) has been shown to improve the field-trapping efficiency and lead to the possibility of pumping more flux into the sample with each consecutive pulse (contrary to the low-temperature case). Various pulse shapes produced different results at high temperatures. Trapezoidal pulses showed the highest efficiency owing to the constant-field segments during which the vortices continued to enter the sample. The critical (activation) field of flux jumps has been shown to decrease with the rising temperature. At the highest considered temperature (30 K), the flux jumps occurred during the TF relaxation. To the best of our knowledge, such calculations have been done for the first time.

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Section: Introductionmentioning

confidence: 99%

Thermal behavior of ﬂux jumps and inﬂuence of pulse-shape on the trapped ﬁeld during pulsed magnetization of a high-temperature superconductor

Moroz¹,

Kashurnikov²,

Rudnev³

et al. 2021

J. Phys.: Condens. Matter

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“…The application range of bulk superconductors is broad. It entails the screening of magnetic fields for protecting measurements circuits and electronics [1][2][3][4], high field small size cryo-magnets [5][6][7][8][9][10][11][12][13][14], flux concentrators that allow one to strongly increase the field generated by a superconducting coil [15], superconducting magnetic bearings that present the advantage, with respect to electro-magnetic ones, that they do not require any regulation for the control of the shaft position [16][17][18][19] and trains in magnetic levitation above a guideway [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Critical current density and current distribution in field cooled superconducting disks

Bernstein

Noudem

Dupont

2016

Supercond. Sci. Technol.

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Applications of bulk superconductors concern superconducting motors and generators, the levitation of vehicles, the generation of high magnetic fields with small size cryo-magnets, the shielding of magnetic fields and other applications. For all of them, it is essential to determine the critical current density, and to understand the effect of the shape and size of the bulks on the properties of interest. In this contribution, we show how the combination of levitation force and trapped field measurements allow one to determine the characteristics and the potential performances of superconducting disks using analytical modeling. As examples of applications we detail the effects of the magnetizing field and of the bulk sheet critical current density on the levitation force. An important result of the reported measurements is that in field-cooled samples, the shielding currents possibly do not flow along the whole thickness of the disks.

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“…This distribution of applied field meets the aim of the earlier flux pumping experiment [6], i.e., that most of the applied field distribution is inside a ring of HTS. Such localized field distributions have been found, experimentally and theoretically, to be advantageous in pulsed activation [6,9,12].…”

Section: The Apparatusmentioning

confidence: 86%

A study of pulsed activation of trapped field magnets: effects of multiple pulsing

Weinstein

Parks

Sawh

et al. 2013

Supercond. Sci. Technol.

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Experimental studies are reported for pulsed activation of trapped field magnets (TFMs), using a sequence of N equal pulses. These experiments are done on low field TFMs for which temperature increase is not yet a dominant limitation. For low and moderate amplitudes of activation pulses heights, B A , the trapped field at any distance r from the TFM centre increases as B T (r, N) ∝ k log N, where k is not a function of N. Thus the increment in trapped field is ∝1/N. Since log N increases without limit as N → ∞, while B T is limited by finite J C , limits are expected on the log N increase. The limiting behaviour is observed at higher values of B T (r, N), and is very well fitted by the multiplicative factor [1 − B T (r, N − 1)/B * (r)]. The resulting phenomenological equation fits the data at essentially all values of N, r, and B A . In this equation, B * (r) plays the role of the limiting value of B T (r) as N → ∞. A study of B * (r) leads to its identification as the trapped field reached in a zero-field-cool activation using a constant field of the same magnitude as the pulsed field.

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The Effectiveness of Pulsed-Field Magnetization with Respect to Different Performance Bulk Superconductors

Cited by 10 publications

References 23 publications

Thermal behavior of ﬂux jumps and inﬂuence of pulse-shape on the trapped ﬁeld during pulsed magnetization of a high-temperature superconductor

Thermal behavior of ﬂux jumps and inﬂuence of pulse-shape on the trapped ﬁeld during pulsed magnetization of a high-temperature superconductor

Critical current density and current distribution in field cooled superconducting disks

A study of pulsed activation of trapped field magnets: effects of multiple pulsing

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