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Variation of Quench Propagation Velocities in YBCO Cables

Tutkimustuotosvertaisarvioitu

Standard

Variation of Quench Propagation Velocities in YBCO Cables. / Härö, E.; Järvelä, J.; Stenvall, A.

julkaisussa: Journal of Superconductivity and Novel Magnetism, Vuosikerta 28, Nro 6, 06.2015, s. 1705-1710.

Tutkimustuotosvertaisarvioitu

Harvard

Härö, E, Järvelä, J & Stenvall, A 2015, 'Variation of Quench Propagation Velocities in YBCO Cables', Journal of Superconductivity and Novel Magnetism, Vuosikerta. 28, Nro 6, Sivut 1705-1710. https://doi.org/10.1007/s10948-015-2976-y

APA

Härö, E., Järvelä, J., & Stenvall, A. (2015). Variation of Quench Propagation Velocities in YBCO Cables. Journal of Superconductivity and Novel Magnetism, 28(6), 1705-1710. https://doi.org/10.1007/s10948-015-2976-y

Vancouver

Härö E, Järvelä J, Stenvall A. Variation of Quench Propagation Velocities in YBCO Cables. Journal of Superconductivity and Novel Magnetism. 2015 kesä;28(6):1705-1710. https://doi.org/10.1007/s10948-015-2976-y

Author

Härö, E. ; Järvelä, J. ; Stenvall, A. / Variation of Quench Propagation Velocities in YBCO Cables. Julkaisussa: Journal of Superconductivity and Novel Magnetism. 2015 ; Vuosikerta 28, Nro 6. Sivut 1705-1710.

Bibtex - Lataa

@article{79c9a7de7f24402dad3ac513726b6562,
title = "Variation of Quench Propagation Velocities in YBCO Cables",
abstract = "We show by modelling that the quench propagation velocity is not constant in HTS coils but it changes during the quench. Due to the large temperature margin between the operation and the current sharing temperatures, the normal zone does not propagate with the temperature front. This means that the temperature will rise in a considerably larger volume when compared to the quenched volume. Thus, the evolution of the temperature distribution below current sharing temperature T (c s) after the quench onset affects the normal zone propagation velocity in HTS more than in LTS coils. This can be seen as an acceleration of the quench propagation velocities while the quench evolves when margin to T (c s) is high. In this paper, we scrutinize quench propagation in a stack of YBCO cables with an in-house finite element method software which solves the heat diffusion equation. We compute the longitudinal and transverse normal zone propagation velocities at various distances from the hot spot to demonstrate the distance-variation of these velocities. According to the results in our particular simulation case, the longitudinal normal zone propagation velocity is 30 {\%} higher far away from the quench origin compared to its immediate vicinity when T (op)=4.2 K and T (c s) =15 K.",
keywords = "High temperature superconductors, Normal zone propagation, Quench simulation, Stability analysis, superconducting magnets, STABILITY CONSIDERATIONS, HTS MAGNETS, SUPERCONDUCTORS, CONDUCTORS, 1D",
author = "E. H{\"a}r{\"o} and J. J{\"a}rvel{\"a} and A. Stenvall",
year = "2015",
month = "6",
doi = "10.1007/s10948-015-2976-y",
language = "English",
volume = "28",
pages = "1705--1710",
journal = "Journal of Superconductivity and Novel Magnetism",
issn = "1557-1939",
publisher = "Springer Verlag",
number = "6",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Variation of Quench Propagation Velocities in YBCO Cables

AU - Härö, E.

AU - Järvelä, J.

AU - Stenvall, A.

PY - 2015/6

Y1 - 2015/6

N2 - We show by modelling that the quench propagation velocity is not constant in HTS coils but it changes during the quench. Due to the large temperature margin between the operation and the current sharing temperatures, the normal zone does not propagate with the temperature front. This means that the temperature will rise in a considerably larger volume when compared to the quenched volume. Thus, the evolution of the temperature distribution below current sharing temperature T (c s) after the quench onset affects the normal zone propagation velocity in HTS more than in LTS coils. This can be seen as an acceleration of the quench propagation velocities while the quench evolves when margin to T (c s) is high. In this paper, we scrutinize quench propagation in a stack of YBCO cables with an in-house finite element method software which solves the heat diffusion equation. We compute the longitudinal and transverse normal zone propagation velocities at various distances from the hot spot to demonstrate the distance-variation of these velocities. According to the results in our particular simulation case, the longitudinal normal zone propagation velocity is 30 % higher far away from the quench origin compared to its immediate vicinity when T (op)=4.2 K and T (c s) =15 K.

AB - We show by modelling that the quench propagation velocity is not constant in HTS coils but it changes during the quench. Due to the large temperature margin between the operation and the current sharing temperatures, the normal zone does not propagate with the temperature front. This means that the temperature will rise in a considerably larger volume when compared to the quenched volume. Thus, the evolution of the temperature distribution below current sharing temperature T (c s) after the quench onset affects the normal zone propagation velocity in HTS more than in LTS coils. This can be seen as an acceleration of the quench propagation velocities while the quench evolves when margin to T (c s) is high. In this paper, we scrutinize quench propagation in a stack of YBCO cables with an in-house finite element method software which solves the heat diffusion equation. We compute the longitudinal and transverse normal zone propagation velocities at various distances from the hot spot to demonstrate the distance-variation of these velocities. According to the results in our particular simulation case, the longitudinal normal zone propagation velocity is 30 % higher far away from the quench origin compared to its immediate vicinity when T (op)=4.2 K and T (c s) =15 K.

KW - High temperature superconductors

KW - Normal zone propagation

KW - Quench simulation

KW - Stability analysis

KW - superconducting magnets

KW - STABILITY CONSIDERATIONS

KW - HTS MAGNETS

KW - SUPERCONDUCTORS

KW - CONDUCTORS

KW - 1D

U2 - 10.1007/s10948-015-2976-y

DO - 10.1007/s10948-015-2976-y

M3 - Article

VL - 28

SP - 1705

EP - 1710

JO - Journal of Superconductivity and Novel Magnetism

JF - Journal of Superconductivity and Novel Magnetism

SN - 1557-1939

IS - 6

ER -