A quasi-optical mode converter is investigated for a 170 GHz, TE/sub 34.19/ mode coaxial-cavity gyrotron, where the ratio of caustic to cavity radius is 0.323. The dimpled-wall launcher is numerically analysed and optimised to provide a wave beam with scalar Gaussian contents of 94.8% and well-focused field at its aperture. The mirror system is adapted to transform the complicated fields radiated from the launcher into a fundamental Gaussian structure. The tolerance conditions of the mirror system to fabrication errors are also investigated. The achieved conversion efficiency is 97% including amplitude and phase.
Investigation of an advanced quasi-optical mode converter for a coaxial gyrotron
2005-01-01
1928203 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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