JT-60 LHRF加熱装置クライストロンの運転経験と改良

Operational experience and improvement of klystrons for the JT-60 LHRF heating system are reported. JT-60 klystron is the most powerful and wide band one forfusion plasma heating. Operational experience of these klystrons were accumulated after encountering many troubles to be removed and the stable operation is performed to repair the electron gun in the klystron. These are reported acompanying the data in detail.