An Exponential Law of Hot Spot Temperature versus Normal Zone Propagation Velocity during the Quench of an <formula><tex>${YBa_{2}Cu_{3}O_{7-\sigma}}$</tex></formula> Pancake Magnet

Jun Zhou, Justin Schwartz

Research output: Contribution to journalArticlepeer-review

Abstract

Using a two-dimensional/three-dimensional (2D-3D) mixed electrothermal model, the quench behavior of an <formula><tex>${YBa_{2}Cu_{3}O_{7-\sigma}}$</tex></formula> (YBCO) pancake magnet is investigated for operating temperature 30 K - 65 K. From many simulations, it is found when the hot spot temperature <formula><tex>${T_{peak}}$</tex></formula> rises to the range [120 K, 300 K], both <formula><tex>${T_{peak}}$</tex></formula> and the normal zone length <formula><tex>${T_{NZ}}$</tex></formula> behave like exponential functions of the longitudinal normal zone propagation velocity (NZPV), as the YBCO pancake magnet is quenched by a disturbance energy (DE) equal to or greater than the minimum quench energy (MQE). The exponential law of <formula><tex>${T_{peak}}$</tex></formula> versus NZPV, as well as <formula><tex>${T_{NZ}}$</tex></formula> versus NZPV, is not obviously affected by the heat disturbance parameters as DEs = MQEs. Similarly, the temperature rising rate d<formula><tex>${dT_{peak}/dt}$</tex></formula> can be regarded as a function of <formula><tex>${T_{peak}}$</tex></formula> in [120 K, 300 K] and is not significantly affected by heat disturbance parameters as DEs = MQEs. These characteristics have potential usage in the formulation of quench detection/protection schemes of HTS YBCO pancake magnets.

Original languageEnglish (US)
JournalIEEE Transactions on Applied Superconductivity
DOIs
StateAccepted/In press - 2020

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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