Comparison between the dielectric-filled rectangular and vacuum folded waveguide as fast-wave launchers in the ICRF

Conference · Sat Jul 01 00:00:00 EDT 1989 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:6600250

Lam, N T; Scharer, J E; Eldridge, O C ^[1]

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1. University of Wisconsin, Madison, WI (USA)

In reactor situations, a waveguide may have certain advantages (such as power handling capability and structural rigidity) over loop antennas as fast wave launchers in tokamaks. We carry out a numerical analysis of a dielectric-filled rectangular waveguide, using a formalim that gives the wave reflection coefficient from the plasma (or the equivalent plasma impedance), once the plasma surface admittance tensor and the eigenmodes of the unloaded launcher are known. In the context of a slab model, we obtain the plasma surface admittance tensor by solving the wave differential equations in a cold plasma, assuming a radiation condition from inside the plasma. The eigenfunctions of the rectangular waveguide are readily written down. For the vacuum folded waveguide, semi-analytical expressions for the TE mode eigenfunctions hasve been obtained by a Ritz variational method. Some problems concerning the calculation of the reflection coefficient for a folded waveguide are discussed.

• DOE Contract Number: FG02-86ER53218
• OSTI ID: 6600250
• Report Number(s): CONF-8905120-; CODEN: APCPC; TRN: 90-032488
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (USA), Vol. 190:1; Conference: 8. topical conference on radio frequency power in plasmas, Irvine, CA (USA), 1-3 May 1989; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPACT IGNITION TOKAMAK
ICR HEATING
TFTR TOKAMAK
COLD PLASMA
NUMERICAL SOLUTION
PLASMA SIMULATION
WAVE PROPAGATION
WAVEGUIDES
CLOSED PLASMA DEVICES
HEATING
HIGH-FREQUENCY HEATING
PLASMA
PLASMA HEATING
SIMULATION
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
TOKAMAK DEVICES
TOKAMAK TYPE REACTORS
700101* - Fusion Energy- Plasma Research- Confinement
Heating
& Production