Bellan, P. M. (1977) Plasma ringing associated with pulsed resonance cones. Physics of Fluids, 20 (4). pp. 649-653. ISSN 0031-9171 http://resolver.caltech.edu/CaltechAUTHORS:BELpof77
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A temporal wave packet of frequency omega0(omegaci, omegapi<<omega0<<omegace, omegape) applied to a finite antenna in a magnetically confined plasma, is shown to excite an electrostatic field consisting of (1) a short-duration resonance cone and (2) a wave-like disturbance which follows afterward. This latter disturbance, which is related to the lower frequency mode of the delta-function induced transients discussed by Simonutti, persists long after the resonance cone. The phase factor associated with the disturbance is independent of omega0, and its constant-phase surfaces are lines which emanate from the antenna and make a small angle theta with respect to the confining magnetic field B. theta decreases with increasing time so that ''wavelengths'' perpendicular to B also decrease with increasing time. The correspondence of the fields obtained by wave-packet excitation to those obtained by both cw and delta-function excitations is discussed and experimental results are reported.
|Additional Information:||Copyright © 1977 American Institute of Physics. (Received 21 June 1976; final manuscript received 8 December 1976) The author wishes to thank Dr. K.L. Wong for his help in making some of the experimental measurements. The technical assistance of J. Johnson and J. Taylor is gratefully acknowledged. This work was supported by the United State Energy Research and Development Administration Contract No. E(11-1)-3073.|
|Subject Keywords:||WAVE PACKETS, ANTENNAS, PLASMA WAVES, MAGNETIC FIELDS, MAGNETIC MIRRORS, ELECTROSTATICS|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||16 Dec 2007|
|Last Modified:||26 Dec 2012 09:48|
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