Thermal stability of oxide superconductors in flux flow state

Nishijima, G.; Awaji, Satoshi; Watanabe, Kazuo

doi:10.1109/tasc.2003.812793

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…Excepting the electric field from equations (23) and (24), one gets relation between the current density and temperature. The latter may be written as…”

Section: Zero-dimensional Approximation Of Applied Current Instabilitymentioning

confidence: 99%

“…The results obtained demonstrate the reason according to which the transient voltage-current characteristics of high-T c superconductor do not allow to find the boundary of the current instability onset. To avoid this complexity, the current charging with break (method of the fixed current) is used in the experiments [16][17][18][21][22][23]. According to this method, there are two final states: temperature and voltage either are stabilized or begin to grow spontaneously.…”

Section: Effect Of Heat Capacity On Transient Electrodynamics States mentioning

confidence: 99%

“…In this case, the macroscopic electrodynamics of superconductor is a consequence of the non-*Address correspondence to this author at the National Research Center "Kurchatov Institute", NBIK-center, 123182 Moscow, Russia; Fax: 7 (499) 1965973; Tel: 7 (499) 1969600; E-mail: vromanovskii@netscape.net local dynamics of vortex lattice that is gradually coming to the motion [13]. The concept of the resistive states significantly expands the range of permissible stable operating mode of high-T c superconducting materials [14][15][16][17][18][19][20][21][22][23]. However, they are characterized by non-trivial temperature change of superconductor, which depends on the electrodynamics processes in superconductor.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Mechanisms of Stable Macroscopic Penetration of Applied Currents in High Temperature Superconductors and their Instability Conditions

Romanovskii¹

2012

TOAPJ

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Macroscopic mechanisms of applied current penetration in high-T c superconductors are discussed to understand the basic physical trends, which are characteristic for the stable and unstable formation of the thermo-electrodynamics states of high-T c superconductors placed in DC external magnetic field. The performed analysis shows that the definition of the current stability conditions of high-T c superconductors must take into consideration the development of the interconnected thermal and electrodynamics states when the temperature of superconductor may stably rise before instability. As a result, the thermal degradation effect of the current-carrying capacity of superconductor exists. The boundary values of the electric field and the current above which the applied current is unstable are defined taking into account the size effect, cooling conditions, non-linear temperature dependences of the critical current density of superconductor. It is proved that the allowable stable values of electric field and current can be both below and above those determined by a priori chosen critical values of the electric field and current of the superconductor. The violation features of the stable current distribution in high-T c superconductors cooled by liquid coolant are studied. The necessary criteria allowing one to determine the influence of the properties of superconductor and coolant on the current instability onset are written.

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“…Excepting the electric field from equations (23) and (24), one gets relation between the current density and temperature. The latter may be written as…”

Section: Zero-dimensional Approximation Of Applied Current Instabilitymentioning

confidence: 99%

Section: Effect Of Heat Capacity On Transient Electrodynamics States mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal Mechanisms of Stable Macroscopic Penetration of Applied Currents in High Temperature Superconductors and their Instability Conditions

Romanovskii¹

2012

TOAPJ

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“…Without a quick dump of current this could lead to conductor overheating and damage [13,14]. Investigating the thermal runaway process is essential in case of the conductors intended for use in magnets [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Current–voltage curve of the high temperature superconductor with local reduction of critical current

Gömöry

Šouc

2021

Supercond. Sci. Technol.

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Particular feature of the 2nd generation of conductors, based on the high-temperature superconducting compounds and produced nowadays in industrial process, is the fluctuation of properties along the conductor length. As a consequence, the voltage appearing at approaching the maximum transportable DC current could come from just one single weak spot. In such a place, characterized by the critical current reduced with respect to the rest of the conductor, the excess dissipation results in a locally elevated temperature. We developed an analytical theory predicting the experimentally observed current–voltage characteristics of such conductor, based on the weak spot properties and the cooling conditions. It extends our previous work, that was focused on forecasting the value of current at which would happen the thermal runaway, accompanied by an abrupt growth of the measured voltage. Here we derive the analytical expression that provides prediction for the current–voltage curve in wider range of currents, without necessity to reach thermal runaway. Then, a more reliable determination of the superconductor properties, in particular the flux creep exponent, can be achieved. Use of the model in the analysis of experimental data is illustrated, and its limitations resulting from the simplifications, introduced in order to reach the analytical predictions, are discussed.

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Basic formation peculiarities of the stable and unstable states of high-Tc composite superconductors at applied fully penetrated currents

Romanovskii

Watanabe

2005

Physica C: Superconductivity

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Thermal stability of oxide superconductors in flux flow state

Cited by 11 publications

References 12 publications

Thermal Mechanisms of Stable Macroscopic Penetration of Applied Currents in High Temperature Superconductors and their Instability Conditions

Thermal Mechanisms of Stable Macroscopic Penetration of Applied Currents in High Temperature Superconductors and their Instability Conditions

Current–voltage curve of the high temperature superconductor with local reduction of critical current

Basic formation peculiarities of the stable and unstable states of high-Tc composite superconductors at applied fully penetrated currents

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