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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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.
|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.|
|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|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||07 Sep 2008 03:08|
|Last Modified:||26 Dec 2012 10:15|
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