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Modeling of Minimum Energy Required to Quench an HTS Magnet with a Strip Heater

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Standard

Modeling of Minimum Energy Required to Quench an HTS Magnet with a Strip Heater. / Härö, E.; Stenvall, A.; van Nugteren, J.; Kirby, G.

julkaisussa: IEEE Transactions on Applied Superconductivity, 2015.

Tutkimustuotosvertaisarvioitu

Harvard

Härö, E, Stenvall, A, van Nugteren, J & Kirby, G 2015, 'Modeling of Minimum Energy Required to Quench an HTS Magnet with a Strip Heater', IEEE Transactions on Applied Superconductivity. https://doi.org/10.1109/TASC.2015.2493125

APA

Härö, E., Stenvall, A., van Nugteren, J., & Kirby, G. (2015). Modeling of Minimum Energy Required to Quench an HTS Magnet with a Strip Heater. IEEE Transactions on Applied Superconductivity. https://doi.org/10.1109/TASC.2015.2493125

Vancouver

Härö E, Stenvall A, van Nugteren J, Kirby G. Modeling of Minimum Energy Required to Quench an HTS Magnet with a Strip Heater. IEEE Transactions on Applied Superconductivity. 2015. https://doi.org/10.1109/TASC.2015.2493125

Author

Härö, E. ; Stenvall, A. ; van Nugteren, J. ; Kirby, G. / Modeling of Minimum Energy Required to Quench an HTS Magnet with a Strip Heater. Julkaisussa: IEEE Transactions on Applied Superconductivity. 2015.

Bibtex - Lataa

@article{beffe4f0007445d78de424ee28996ed3,
title = "Modeling of Minimum Energy Required to Quench an HTS Magnet with a Strip Heater",
abstract = "Due to the wide spectrum of current sharing temperatures in an HTS magnet, estimating the energy required to quench the magnet is a complicated task. On the other hand, quenching an LTS magnet for quench characterization purposes with a heater is straight-forward due to the small temperature margin, and correspondingly low minimum quench energy (MQE). To estimate the required energy for LTS magnet, the analytic concept of MQE can be utilized. In this paper we propose that only numerical simulations can give adequate estimates to the MQE of an HTS magnet for measurement purposes. Further, due to the high enthalpy margin, the utilization of spot heaters with short energy pulses becomes questionable. We present in detail the effect of heater’s pulse length to the MQE when a strip heater is utilized for quenching. In addition, the effect of the heater area on MQE is studied. We consider the model of a REBCO coil to be constructed and tested in a European project EuCARD-2. According to the results: 1) MQE increases almost linearly for pulse lengths between 100 ms and 500 ms. 2) When the heater area is enlarged, the required energy per area saturates to a certain value related to the coil’s enthalpy margin. 3) MQE obtained with a traditional analytic approach based on a minimum propagating zone (MPZ) underestimates considerably the numerically obtained MQE.",
keywords = "Finite element analysis, Heating, High-temperature superconductors, Magnetic domains, Saturation magnetization, Superconducting magnets, Temperature measurement, high temperature superconductors, minimum quench energy, quench simulation, stability analysis, super conducting magnets",
author = "E. H{\"a}r{\"o} and A. Stenvall and {van Nugteren}, J. and G. Kirby",
year = "2015",
doi = "10.1109/TASC.2015.2493125",
language = "English",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Modeling of Minimum Energy Required to Quench an HTS Magnet with a Strip Heater

AU - Härö, E.

AU - Stenvall, A.

AU - van Nugteren, J.

AU - Kirby, G.

PY - 2015

Y1 - 2015

N2 - Due to the wide spectrum of current sharing temperatures in an HTS magnet, estimating the energy required to quench the magnet is a complicated task. On the other hand, quenching an LTS magnet for quench characterization purposes with a heater is straight-forward due to the small temperature margin, and correspondingly low minimum quench energy (MQE). To estimate the required energy for LTS magnet, the analytic concept of MQE can be utilized. In this paper we propose that only numerical simulations can give adequate estimates to the MQE of an HTS magnet for measurement purposes. Further, due to the high enthalpy margin, the utilization of spot heaters with short energy pulses becomes questionable. We present in detail the effect of heater’s pulse length to the MQE when a strip heater is utilized for quenching. In addition, the effect of the heater area on MQE is studied. We consider the model of a REBCO coil to be constructed and tested in a European project EuCARD-2. According to the results: 1) MQE increases almost linearly for pulse lengths between 100 ms and 500 ms. 2) When the heater area is enlarged, the required energy per area saturates to a certain value related to the coil’s enthalpy margin. 3) MQE obtained with a traditional analytic approach based on a minimum propagating zone (MPZ) underestimates considerably the numerically obtained MQE.

AB - Due to the wide spectrum of current sharing temperatures in an HTS magnet, estimating the energy required to quench the magnet is a complicated task. On the other hand, quenching an LTS magnet for quench characterization purposes with a heater is straight-forward due to the small temperature margin, and correspondingly low minimum quench energy (MQE). To estimate the required energy for LTS magnet, the analytic concept of MQE can be utilized. In this paper we propose that only numerical simulations can give adequate estimates to the MQE of an HTS magnet for measurement purposes. Further, due to the high enthalpy margin, the utilization of spot heaters with short energy pulses becomes questionable. We present in detail the effect of heater’s pulse length to the MQE when a strip heater is utilized for quenching. In addition, the effect of the heater area on MQE is studied. We consider the model of a REBCO coil to be constructed and tested in a European project EuCARD-2. According to the results: 1) MQE increases almost linearly for pulse lengths between 100 ms and 500 ms. 2) When the heater area is enlarged, the required energy per area saturates to a certain value related to the coil’s enthalpy margin. 3) MQE obtained with a traditional analytic approach based on a minimum propagating zone (MPZ) underestimates considerably the numerically obtained MQE.

KW - Finite element analysis

KW - Heating

KW - High-temperature superconductors

KW - Magnetic domains

KW - Saturation magnetization

KW - Superconducting magnets

KW - Temperature measurement

KW - high temperature superconductors

KW - minimum quench energy

KW - quench simulation

KW - stability analysis

KW - super conducting magnets

U2 - 10.1109/TASC.2015.2493125

DO - 10.1109/TASC.2015.2493125

M3 - Article

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

ER -