Presentation Abstract

Presentation Number: 1MX-08
Title: Quench characteristics of a cu-stabilized 2g hts conductor
Presentation Time: Monday, Aug 02, 2010, 6:00 PM - 6:15 PM
Authors: E. A. Young1, I. Falorio1, S. Chapell2, Y. Yang1;
1University of Southampton, 2Oxford Instruments.
Keyword: ++M5.5 HTS: Stability, Calorimetry, and Other Thermal Properties
Abstract: The prospect of medium/high field superconducting magnets using 2G HTS tapes is approaching to reality with continued enhancement in the performance of these conductors. Direct measurements of 1d adiabatic quench initiation and propagation of a Cu-stabilized 2G conductor have been carried out with spatial-temporal recording of temperature and voltage following the deposition of various local heat pulses to the conductor at different temperatures between 30K and 77K carrying different transport currents. It was found that the stabilizer-free 2G tape maintains the unique characteristics previously measured in non-stabilized tape of increasing MPZ with transport current and higher quench energy at lower temperatures. The minimum quench energy, minimum propagation zone (MPZ) length and the propagation velocity are determined as a function of temperature and transport current. The change in MPZ size is investigated with measured temperature dependent E-J characteristics and 1D modeling. The results add another context to the unique characteristics of increasing MPZ with transport current and higher quench energy at lower temperatures