Modeling of Minimum Energy Required to Quench an HTS Magnet with a Strip Heater
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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.Tutkimustuotos › › vertaisarvioitu
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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 -