Reliability Test of the 170GHz Gyrotron for ITER

Using the ITER relevant 170 GHz gyrotron, repetitive operation with long pulse and high power is conducted. The first consecutive days repetitive operation with ITER equivalent condition (800 kW/600 s with 20 min interval) is successfully performed in JAEA gyrotron test stand in order to obtain a basic data of the reliability of the current gyrotron system. Seventy-two shots out of 88 shots were successfully continued until the end of the pulse (600 s). The successful rate was 82%. The results demonstrate the feasibility of gyrotron operating at a high reliability for high power long pulse operation for ITER like conditions.