Abstract
In this paper the layout and preliminary design is described of an installation for the injection of electron-cyclotron wave power into JET. The installation consists of 12 gyrotrons, each 70 GHz, 200 kW RF-output power and a pulse duration of 10 s. A layout for the installation is given using vertical ports at the top and the bottom of the vacuum vessel for launching the RF power into the JET plasma. The electric power for the gyrotrons will be supplied by two high voltage transformer rectifiers with controllable output voltage. Each of the two modulators will use a series tube to regulate the required voltage of 80 kV for six gyrotrons. Possibilities to modulate the RF power are discussed. The entire system will be operated by means of the computerized control and data acquisition system (CODAS). The protection system that ensures a safe and reliable operation of the gyrotrons is described. The microwave considerations for the predesign of the transmission lines and launching systems are covered.
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