A powerful millimetre-wave line transmitting energy from a gyrotron to a tokamak is studied. The line is open and combines mirrors and sections of an irregular oversized circular waveguide. The construction of the transmission line units is improved to provide selectivity for the operating TE01 mode. Particularly, the open quasioptical elbow operating at the long-wave region of the millimetre range and rotating the line by an angle of 90° is experimentally investigated. The operating TE01 mode insertion losses are 0.2-0.3 dB with a 4% bandwidth.
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Shapiro et al. (1992) studied this question.
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