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Observation of wave-packet propagation in the ion cyclotron range of frequencies in a tokamak plasma

Greene, G. J. and Gould, R. W. (1991) Observation of wave-packet propagation in the ion cyclotron range of frequencies in a tokamak plasma. Physics of Fluids B, 3 (2). pp. 406-413. ISSN 0899-8221. http://resolver.caltech.edu/CaltechAUTHORS:GREpofb91

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Abstract

Experimental observation of wave-packet propagation in the ion cyclotron range of frequencies in a tokamak plasma is reported. Studies were carried out in the Caltech Research Tokamak [Phys. Fluids 23, 614 (1980)] in a pure hydrogen plasma and in a regime where fast-wave damping was sufficiently small to permit multiple toroidal transits of the wave packet. Waves were launched by exciting a small loop antenna with a short burst of radio-frequency current and were detected with shielded magnetic probes. Probe scans revealed a large increase in wave-packet amplitude at smaller minor radii, and the packet velocity was found to be independent of radial position. Measurement of the packet transit time yielded direct information about the wave group velocity. Packet velocity was investigated as a function of the fundamental excitation frequency, plasma density, and toroidal magnetic field. Results are compared with the predictions of a cold plasma model that includes a vacuum layer at the edge.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.859750DOIUNSPECIFIED
http://dx.doi.org/10.1063/1.859750PublisherUNSPECIFIED
Additional Information:© 1991 American Institute of Physics. Received 13 December 1989; accepted 3 August 1990. This work was supported by the U. S. Department of Energy under Contracts No. DE-AS03-76-SFO-0767 and No. DE-AC02-76-CHO-3073.
Funders:
Funding AgencyGrant Number
U. S. Department of EnergyDE-AS03-76-SFO-0767
U. S. Department of EnergyDE-AC02-76-CHO-3073
Subject Keywords:WAVE PACKETS, ICR HEATING, TOKAMAK DEVICES, PLASMA, HYDROGEN, DAMPING, ANTENNAS, MAGNETIC PROBES, AMPLITUDES, VELOCITY, PLASMA DENSITY, FREQUENCY DEPENDENCE, MAGNETIC FIELDS, TOROIDAL CONFIGURATION, CORRELATIONS, COLD PLASMA, GROUP VELOCITY
Record Number:CaltechAUTHORS:GREpofb91
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:GREpofb91
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11538
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Sep 2008 03:08
Last Modified:26 Dec 2012 10:15

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