Abstract
In this work, the initial design concept of a 1.0-1.5 MW, longpulse gyrotron operating at 120 GHz, for plasma start-up in the ITER has been presented. Mode competition and mode selection procedures are carried out for various candidate modes and the modes TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">24,8</sub> or TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">24,7</sub> are chosen as probable operating modes. Cold cavity design and self-consistent and time dependent calculations are carried out for the TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">24,8</sub> mode and power and efficiencies are computed. The nominal beam parameters are chosen to give a moderate to low velocity spread. The initial results are indicating that an output power of well over 1.0 MW, CW can be achieved at 120 GHz with the TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">24,8</sub> mode as the operating cavity mode. Further investigations to consolidate the design concept are in progress at the time of reporting this paper.
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