Wave transmission lines and networks – Coupling networks – Nonreciprocal gyromagnetic type
Patent
1986-10-27
1988-03-01
Gensler, Paul
Wave transmission lines and networks
Coupling networks
Nonreciprocal gyromagnetic type
219 1055A, 333248, 333 99PL, H01P 500
Patent
active
047289104
ABSTRACT:
A resonant cavity waveguide coupler for ICRH of a magnetically confined plasma. The coupler consists of a series of inter-leaved metallic vanes disposed withn 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 50-200 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.
REFERENCES:
patent: 2281552 (1942-05-01), Barrow
patent: 3851131 (1974-11-01), Johnston et al.
patent: 4241323 (1980-12-01), Griffin et al.
W. L. Barrow et al, "Hollow Pipes of Relatively Small Dimensions," AIEE Transactions, Mar. 1941, vol. 60, pp. 119-122.
T. L. Owens et al, "New Developments in Waveguide and Loop Coupler Technology for ICRF Heating," Bulletin of the APS Series II, vol. 30, No. 9, Oct. 1985, p. 1589.
Breeder David E.
Gensler Paul
Hamel Stephen D.
Hightower Jusdon R.
The United States of America as represented by the United States
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