A High-Power Gyrotron and high-power mm wave technology for Fusion Reactor

摘要

Recent activities on the developments of high power gyrotrons and high power millimeter wave technologies in JAEA are presented. A basic criterion of ITER gyrotron was satisfied using a JAEA TE318mode gyrotron. The output power from the gyrotron is used for developments of transmission line components and ITER launcher. The gyrotron is being operated for 3 years, and demonstrated operational reliability. As a next step, a new gyrotron was designed and fabricated, which operates at higher order resonator mode to enable the operation at greater than 1 MW. In parallel, feasibility studies of power modulation and dual frequency gyrotron were carried out. On 110GHz gyrotron system of JT-60U, 2.9MW power injection into the plasma was demonstrated for 5 sec pulse duration. The EC technologies under development for ITER and JT-60SA are applicable also for future fusion reactors such as DEMO