Plasma ringing associated with pulsed resonance cones

Technical Report · Tue Jun 01 04:00:00 EDT 1976

DOI:https://doi.org/10.2172/7266476· OSTI ID:7266476

Bellan, P M

A temporal wave-packet of frequency ..omega../sub 0/ (..omega../sub ci/, ..omega../sub pi/ much less than ..omega../sub ce/, ..omega../sub pe/) 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 afterwards. This latter disturbance, which is related to the lower frequency mode of the detla-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 surface 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: Princeton Univ., N.J. (USA). Plasma Physics Lab.
• OSTI ID: 7266476
• Report Number(s): MATT-1260
• 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
ELECTROMAGNETIC RADIATION
EQUIPMENT
MAGNETIC FIELDS
PLASMA
PLASMA WAVES
RADIATIONS
RESONANCE