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

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Details

Original languageEnglish
JournalIEEE Transactions on Applied Superconductivity
DOIs
Publication statusPublished - 2015
Publication typeA1 Journal article-refereed

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

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