The prototypes of the elements of UNK quench protection system - quench detectors on magnetic modulators, quench stopper, safety leads, bypass switches - are studied on the string of 4 UNK superconducting magnets. The string simulates the operation of two quench protection units (QPU). Many quenches at the various parts of SC circuit from lkA up to UNK nominal current 5kA were induced. No quench propagation from one to another QPU was observed. Parameters of quench protection system elements corresponded to tolerated ones.
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