Study of quench propagation with quench antennas

A quench antenna consists of four multipole coils whose signals give us information about the position of a quench origin and current redistribution. In this paper, we report a simulation and test results of the quench antenna developed for the TRISTAN insertion quadrupole magnets (QCS magnets). Heater quench tests were performed, and it was confirmed that the quench start locations evaluated from quench antenna signals were consistent with those from the voltage tap signals and the heater position. The amplitude and the direction of the current redistribution were calculated, and they did not conflict with what was expected from a simulation.