Induced nuclear reactions: processes – systems – and elements – Nuclear fusion – Magnetic confinement of plasma
Patent
1993-01-19
1994-02-22
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Nuclear fusion
Magnetic confinement of plasma
G21B 100
Patent
active
052895092
ABSTRACT:
A comb-line antenna structure (80) includes a multiplicity of parallel current straps (86) through which an appropriate rf electrical current passes in order to launch a desired magnetosonic wave (42) into an adjacent plasma mass (39). The current straps are mounted within a conductive, shallow, open box (88, 90) that faces the plasma mass. The current straps are inductively coupled, thereby requiring only a single rf input port (82) at one end of the comb-line structure. The rf input port provides a substantially constant impedance to an rf power source. A single rf output port (84) at the other end of the comb-line structure allows for the recirculation of the rf power. A multiplicity of U-shaped wickets (92) loop over and enclose each current strap. Such wickets function as a Faraday shield to shield the plasma and adjacent current straps from electrostatic fields. The comb-line antenna structure finds primarily applicability in providing plasma heating and/or current drive in a tokamak, or equivalent plasma-forming structures.
REFERENCES:
patent: 4661304 (1987-04-01), Perkins, Jr. et al.
patent: 4710339 (1987-12-01), Ohkawa
patent: 4755345 (1988-07-01), Baity, Jr. et al.
Chiu, et al., "Study of the Slow-Wave Structure as an ICRF Launcher", Nuclear Fusion, vol. 24, (6), pp. 717-723 (1984).
Matthaei, "Comb-Line Band-Pass Filters of Narrow or Moderate Bandwidth", Microwave Journal, pp. 82-91 (Aug. 1963).
Moeller, et al., "A Comb Line Structure for Launching Unidirectional Fast Waves", in Radiofrequency Heating and Current Drive of Fusion Devices. Europhysics Conference Abstracts, vol. 16E, Brussels, 7-10 Jul. 1992, Editors: C. Gormezano, et al.
General Atomics
Wasil Daniel D.
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