Plasma ringing associated with pulsed resonance cones

Journal Article · Fri Apr 01 04:00:00 EST 1977 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.861924· OSTI ID:7308463

Bellan, P M

A temporal wave packet of frequency ..omega../sub 0/(..omega../sub c i/, ..omega../sub p i/very-much-less-than..omega../sub 0/very-much-less-than..omega../sub c e/, ..omega../sub p e/) 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 ..omega../sub 0/, 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.

• Research Organization: Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08540
• OSTI ID: 7308463
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 20:4; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
ANTENNAS
ELECTRICAL EQUIPMENT
ELECTROSTATICS
EQUIPMENT
MAGNETIC FIELDS
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
PLASMA WAVES
THERMONUCLEAR DEVICES
WAVE PACKETS