Quench characteristics of HTS conductors at low temperatures

Abstract

Not withstanding their high stability at liquid nitrogen
temperatures, quench propagation due local disturbances
remains a crucial issue for high temperature superconductors
(HTS) operating at low temperatures as high field insert coils and
cryogen-free magnets. In contrast to low temperature superconductors
(LTS), normal zone in HTS at low temperatures must
develop over a much extended temperature range for current
sharing with a highly non-linear dependence on temperature. The
present work addresses this issue directly using both computer
simulation and experimental studies. Several quench characteristics
unique to HTS have identified using a comparative study
of the underlying quasilinear parabolic equation represented in
an appropriate dimensionless form for proper isolation of the
known effects of temperature dependence of thermal properties.
Most notable and counter-intuitive finding is that the minimum
propagation zone (MPZ) was found to increase with transport
current. The correlations of minimum quench energy (MQE) and
the quench temperature of MPZ with operating temperature and
current have been obtained for comparison with experimental
results.

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Identifiers

ORCID for Yifeng Yang: orcid.org/0000-0002-3874-6735

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