Self-field quench behaviour of YBa2Cu307-δ coated conductors with different stabilizers

摘要

Self-field quench behaviours of YBa2Cu307-δ coated conductors with different stabilizers arestudied. Samples include one with Cu on both sides (Cu—Cu), one with stainless steel on bothsides (SS—SS), and one with Cu on one side and stainless steel on the other (Cu—SS). Themeasurements of the minimum quench energy (MQE) and normal zone propagation velocity(NZPV) are taken at various temperatures (30-75 K), and transport currents (30%Icto 90% Ic)at a typical pressure of 10-5 Pa. Of the three samples, the Cu—Cu sample has the highest MQEwhile the SS—SS one has the lowest MQE at the same temperature and percentage of Ic; theNZPV in the SS—SS sample is found to be the highest while those of the Cu—Cu and Cu—SSsamples are similar. The normal zone voltage and the hot-spot temperature are also compared.Both the classic adiabatic quench propagation model and the interface resistance model are usedto explain the NZPV and MQE differences between the samples. The implications forconductor design and quench detection and protection are discussed.