Flux Jumps at Pulsed Field Magnetization

Korotkov, V. S.; Krasnoperov, E. P.; Kartamyshev, A. A.

doi:10.1007/s10948-016-3472-8

Cited by 17 publications

(22 citation statements)

References 13 publications

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“…The sharp drop in the current at  m is the break of shielding current. The observed picture of the BSC is similar as in [3]. The discrepancy in parameters of BSC are related to the size of the annulus (inductance L) and the value of the critical current.…”

Section: Experimental Technique and Resultssupporting

confidence: 67%

“…The inner and outer diameters of the typical sample were 52 and 28 mm and thickness of 11 mm. Pulsed field magnetization technique and measurements of the circulated shielding current (with Rogowsky belt) were described in [3]. The experiments were performed under the liquid nitrogen temperature.…”

Section: Experimental Technique and Resultsmentioning

confidence: 99%

“…This method, as it turned, is more precise and stable for solving (3) than the explicit method [11]. In this method the difference (in this case, of the current) is written as half of sum of adjacent values of the function in the right part of the equation (3). The increment of the current was calculated in the assumption that during the time interval of t =1 s the temperature increment (and corresponding I c ) gives the contribution of the second order.…”

Section: Procedures Of the Calculationmentioning

confidence: 99%

“…In the case of pulsed field magnetization of superconducting annuli made of melt grown HTS the break of shielding current (BSC) followed by flux jump inside the annual's hole were observed at T = 78 K [3]. The dynamics of these flux jumps differs from classical thermomagnetic instability.…”

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confidence: 96%

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The break of shielding current at pulsed field magnetization of a superconducting annulus (experiment and model simulation)

Korotkov

Krasnoperov

Kartamyshev

2017

Supercond. Sci. Technol.

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The superconducting current breaking effect at pulsed field magnetization of HTS annuli was carefully investigated. It is proposed the simple model for qualitative description of this process. In particular, it is shown the appearance of a narrow sector of the considerable heating through which the magnetic flux penetrates into the superconducting annuli. Introduction.Hard superconductors of type-II have the thermomagnetic instability at low temperatures. This instability manifested as avalanche-like flux penetration of magnetic field inside the superconductor [1]. It is so called flux jumps, appearing in the isothermal conditions, at any low perturbation. The thermomagnetic instability in high temperature superconductors (HTS) is not observed above 40 K due to a large heat capacity [2]. At high temperatures under the conditions of isothermal magnetization of a superconductor hollow cylinder or annulus (the ring with rectangular cross section) an inhomogeneous field is formed inside the body according to the critical state model, so dH/dr J С [1]. The superconducting current shields the interior until it fills the entire cross-section of the annulus. At the further magnetization the circulating current does not change its value maintaining the difference (H ex -H in )/(R ex -R in ) = 4J c between the

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Section: Experimental Technique and Resultssupporting

confidence: 67%

Section: Experimental Technique and Resultsmentioning

confidence: 99%

Section: Procedures Of the Calculationmentioning

confidence: 99%

mentioning

confidence: 96%

See 2 more Smart Citations

The break of shielding current at pulsed field magnetization of a superconducting annulus (experiment and model simulation)

Korotkov

Krasnoperov

Kartamyshev

2017

Supercond. Sci. Technol.

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“…Импульсное намагничивание дисков и колец из монодоменных ВТСП широко исследуется и достаточно корректно описывается в рамках предположения о степенной вольт-амперной характеристике (ВАХ) сверхпроводника [7]. При импульсном намагничивании одновиткового кольца могут происходить локальный нагрев узкого сектора кольца и обрыв экранирующего тока [8]. В момент обрыва тока поле в кольце становится равным внешнему полю.…”

unclassified

Импульсное Намагничивание Короткозамкнутой Катушки Из ВТСП

Бражник¹,

Картамышев²,

Коротков³

et al. 2019

Журнал Технической Физики

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In this paper is described the pulsed magnetization of a 20-turn short-circuited coil from a stabilized HTSC-2G tape. The trapped field in the coil is close to the value obtained at the field cooling (FC) process and varies only slightly with a 5-fold increase in the amplitude of the magnetizing pulse. The copper coating of the tape significantly reduces the effects of pulsed heating. The relaxation of the current in the initial stage is determined by the flow of current between the superconducting and normal layer and the type of the current-voltage characteristic. At large times (t> 100 s), attenuation is determined by the contact resistance of the junction.

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Microstructure and Superconducting Properties of Rapid Heating, Quenching, and Transformation (RHQT) Powder‐in‐Tube Nb₃Al Wires Doped with Sn Element

Ran

Chen

et al. 2021

Physica Status Solidi (a)

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Properties of rapid heating, quenching, and transformation (RHQT)‐treated powder‐in‐tube (PIT) Nb3Al1−xSnx wires are studied herein. After the RHQ process, the body‐centered cubic (bcc) phase is formed in the Sn‐doped Nb3Al wires. The transformed superconducting A15 phase shows a uniform microstructure and homogenous component distribution feature. With the increase of the Sn doping level, the critical transition temperature (Tc), critical current density (Jc), and irreversibility field (Birr) of the superconducting wires increase first and then reduce, achieving the highest Tc value of 17.6 K and the smallest ΔTc of 0.6 K in the 4% Sn doped Nb3Al wire. The 4% Sn addition helps to improve the layer Jc of the sample to 2.1 × 105 A cm−2 at 8 K and 5 T, which is about 2.5 times that of the pure Nb3Al sample. Furthermore, the Nb3Al1−xSnx (x = 0.04) wire gives the highest Birr value of 17.22, 13.23, and 9.11 T at 8, 10, and 12 K, respectively. The addition of Sn helps to achieve stoichiometric Nb3Al A15 phase and formation of precipitations with the size of 10 nm, which might act as the flux‐pinning center.

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Flux Jumps at Pulsed Field Magnetization

Abstract: Abstract. Flux jumps lead to [10][11][12][13][14][15][16][17][18][19][20]

Cited by 17 publications

References 13 publications

The break of shielding current at pulsed field magnetization of a superconducting annulus (experiment and model simulation)

The break of shielding current at pulsed field magnetization of a superconducting annulus (experiment and model simulation)

Импульсное Намагничивание Короткозамкнутой Катушки Из ВТСП

Microstructure and Superconducting Properties of Rapid Heating, Quenching, and Transformation (RHQT) Powder‐in‐Tube Nb₃Al Wires Doped with Sn Element

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Flux Jumps at Pulsed Field Magnetization

Abstract: Abstract. Flux jumps lead to [10][11][12][13][14][15][16][17][18][19][20]

Cited by 17 publications

References 13 publications

The break of shielding current at pulsed field magnetization of a superconducting annulus (experiment and model simulation)

The break of shielding current at pulsed field magnetization of a superconducting annulus (experiment and model simulation)

Импульсное Намагничивание Короткозамкнутой Катушки Из ВТСП

Microstructure and Superconducting Properties of Rapid Heating, Quenching, and Transformation (RHQT) Powder‐in‐Tube Nb3Al Wires Doped with Sn Element

Contact Info

Product

Resources

About

Microstructure and Superconducting Properties of Rapid Heating, Quenching, and Transformation (RHQT) Powder‐in‐Tube Nb₃Al Wires Doped with Sn Element