Folded waveguide coupler

Patent · Mon Oct 27 04:00:00 EST 1986

OSTI ID:5997516

Owens, T L

A resonant cavity waveguide coupler for ICRH of a magnetically confined plasma. The coupler consists of a series of inter-leaved metallic vanes disposed within an enclosure analogous to a very wide, simple rectangular waveguide that has been ''folded'' several times. At the mouth of the coupler, a polarizing plate is provided which has coupling apertures aligned with selected folds of the waveguide through which rf waves are launched with magnetic fields of the waves aligned in parallel with the magnetic fields confining the plasma being heated to provide coupling to the fast magnetosonic wave within the plasma in the frequency usage of from about 50 to 200 mHz. A shorting plate terminates the back of the cavity at a distance approximately equal to one-half the guide wavelength from the mouth of the coupler to ensure that the electric field of the waves launched through the polarizing plate apertures are small while the magnetic field is near a maximum. Power is fed into the coupler folded cavity by means of an input coaxial line feed arrangement at a point which provides an impedance match between the cavity and the coaxial input line.

• Research Organization: Oak Ridge Y-12 Plant, TN (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-84OS21400
• Assignee: Dept. of Energy
• Patent Number(s): 4,728,910
• Application Number: 06/923,540
• OSTI ID: 5997516
• Country of Publication: United States
• Language: English

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