This paper presents the design study of a quasi-optical launcher for a 170GHz gyrotron, designed for electron cyclotron heating in an experimental tokamak in India. TE{sub}24,8 has been selected as the operating mode. Quasi-optical (QO) mode converters are used to transform electromagnetic waves of complex structure and polarization generated in gyrotron cavities into a linearly polarized, Gaussian-like beam suitable for transmission [1]. A quasi-optical mode converter is the combination of an open waveguide antenna (launcher) and a mirror system. Optimization of the mode-converter is done by varying the design parameters and launcher parameters using LOT.
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