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Measurements of the complex plasma loading impedance of the magnetosonic cavity modes

Hwang, D. Q. and Gould, R. W. (1980) Measurements of the complex plasma loading impedance of the magnetosonic cavity modes. Physics of Fluids, 23 (3). pp. 614-623. ISSN 0031-9171. http://resolver.caltech.edu/CaltechAUTHORS:HWApof80

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Abstract

The complex plasma loading impedance of the fast magnetosonic wave in the Caltech tokamak has been investigated at low power (between 10 and 300 W). The magnetosonic cavity modes are observed both as voltage maxima at the output of a six-turn receiving probe, and as maxima in the input resistance of the transmitting antenna. When the real and imaginary parts of the measured plasma loading impedance are plotted in the complex impedance plane, the resulting curves are approximately circles, indicating a resonance phenomenon. The observed plasma loading resistance at the various cavity modes is as high as 3 to 4 times the basic antenna resistance (~0.4Ω). This means that efficient energy coupling into the tokamak and low losses in the antenna system are possible. The estimated cavity Q's are between 400 and 700.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.863032DOIUNSPECIFIED
Additional Information:© 1980 American Institute of Physics. Received 23 May 1979; accepted 20 November 1979. One of the authors (DQH) would like to express his appreciation to Dr. W. Bridges, Dr. J. Long, and Dr. H. Martel for the many useful discussions and suggestions. Special thanks go to F. Cosso for his skillful assistance in constructing the experimental instruments. This work was supported by the U.S. Department of Energy Contract AT (04-3) 767, Project Agreement No. 2.
Funders:
Funding AgencyGrant Number
Departement of EnergyAT (04-3) 767
Subject Keywords:PLASMA WAVES, MAGNETOACOUSTIC WAVES, ELECTRIC IMPEDANCE, TOKAMAK DEVICES, PLASMA DIAGNOSTICS, RESONANCE, Q−VALUE, PLASMA HEATING, ICR HEATING, CAVITY RESONATORS, ANTENNAS, COLD PLASMA, COLLISIONLESS PLASMA, MAGNETIC FIELDS, DISPERSION RELATIONS, EIGENFREQUENCY, SIMULATION
Record Number:CaltechAUTHORS:HWApof80
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HWApof80
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11446
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Sep 2008 02:13
Last Modified:26 Dec 2012 10:14

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