Design, simulation, and experimental results of a 110 GHz high-power gyrotron mode converter
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
The authors present the design, computer simulation, and experimental results of a quasi-optical mode converter for use in a 110 GHz high-power gyrotron. The particular gyrotron under test generates a right-handed TE{sub 22.6} circular waveguide mode, and is designed to produce megawatt power levels over pulse durations on the order of 5s. This high power level provides a rigorous constraint on the output-beam shape; namely, that the peaking factor be approximately 2.0. Such a peaking factor corresponds to a nearly flat power distribution across the output window to allow for proper cooling of the window. To that end, the mode converter employs a rippled-wall waveguide mode transformer/beam launcher, and a pair of toroidal focusing mirrors to produce a Gaussian-like beam. Two shaping mirrors follow, and convert the Gaussian beam into a quasi-optical beam with a flat power distribution. The rippled-wall launcher was designed using standard coupled mode theory, and the toroidal mirrors derive from Gaussian beam analysis. The shaping mirrors result from a vector diffraction synthesis procedure developed at UW.
- OSTI ID:
- 423043
- Report Number(s):
- CONF-960634-; TRN: IM9707%%350
- Resource Relation:
- Conference: 1996 IEEE international conference on plasma science, Boston, MA (United States), 3-5 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of IEEE conference record -- Abstracts: 1996 IEEE international conference on plasma science; PB: 324 p.
- Country of Publication:
- United States
- Language:
- English
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