PERFORMANCE OF THE US QUENCH DETECTION SYSTEMS IN THE QUELL EXPERIMENTS

The Quench of Long Length (QUELL) experiments have been completed. The US contribution was to develop and implement both conventional and no vel techniques ill quench detection. The results of the quench detecti on experiments demonstrate that all US systems functioned as expected. The most important criteria for the comparison of the various quench detection systems were tile time constant of the response and noise re jection by the system. The novel US internal (inside the CICC) sensors included; I) a cowound voltage sensor, and 2) a fiberoptic temperatur e sensor. Tile internal sensors combined fast response with high noise rejection capacity, and proved to offer potentially high reliability for ITER. The conventional sensors, namely the absolute pressure trans ducer and Venturi flowmeters, confirmed inherent thermo-hydaulic time response limitations ill measurements of pressure and flow that exclud es them as quench detectors for ITER and other large scale CICC applic ations.