Development of mechanical PCS for SMES

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(1) Quench of the mechanical PCS, which was energized by the lamp current, generated with a time delay after the instantaneous PCS current exceeded a static quenching current (the quench delay).(2) The quench delay was attributed to the time in which the temperature of the superconducting connection bridge became higher than the critical temperature due to the magnetic flux flow loss.(3) An optical observation system was developed in order to observe bubble behavior in the subcooled liquid nitrogen. It became clear the bubble collapsed within 1ms, which was much shorter than in pool boiling liquid nitrogen.(4) Bubble formation process in the presence of free conducting particle in liquid helium was investigated. Experimental results showed that a single bubble was always generated at the moment of particle collision with the electrode and bubble behavior depended strongly on the state of liquid helium.