Two experiments, both on stability and protection issues for high-temperature superconducting (HTS) magnets, are described. Each experiment, with a silver-sheathed BiPbSrCaCuO(2223) tape test sample cooled by a cryocooler, covers the temperature range 20/spl sim/50 K in a zero magnetic field. In this paper, preliminary results on normal zone propagation are presented. Experiment 1 measures normal zone propagation in both longitudinal and transverse directions in a 3-layer test pancake coil; experiment 2 measures temperature distributions, both spatial and temporal, along a length of a conductor undergoing quenching in the longitudinal direction. These results are consistent with those of a simulation code.
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