Journal of Microwave Power and Electromagnetic Energy (JMPEE)
TITLE	Super Power Klystrons for Fusion Plasma Heating [PDF]
AUTHORS	T. Okamoto, S. Miyake, H.Ohno, S. Hosoi, H. Ishihara, T. Nagashima, K. Uehara, T. Imai, T. Fujii, K. Sakamoto, Y. Ikeda and M. Saigusa 1985 20 3 173-179
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Abstract For fusion plasma heating, two types of 2 GHz 1 MW klystrons were developed. They were 6-cavity, frequency-tunable klystrons which could deliver 1 MW continuous output power for 10 s duration. Each klystron has a similar electron gun with a modulation anode, and an evaporation-cooled collector. A prototype klystron was tested for 1 MW performance successfully and a two-window version was also manufactured in order to reduce the thermal stress of the window material. A high-power magic tee was used in order to combine the two power outputs and to produce more than the 1 MW power output. The window temperature was observed to rise, with light emission. The measured temperature rise was about 16°C at the end of 10 s duration, when the klystron was operated at the power level of 500 kW per window. An external digital computer was used to control the high-speed tuning mechanism several times during every one pulse operation.