Accession Number:

AD0759789

Title:

Linear and Nonlinear Tonks-Dattner Resonances in Laboratory Afterglow Plasmas.

Descriptive Note:

Physical sciences research papers,

Corporate Author:

AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s):

Report Date:

1973-02-07

Pagination or Media Count:

39.0

Abstract:

The electroacoustic resonances commonly known as Tonks-Dattner resonances were excited in neon, argon, xenon and mercury afterglow plasmas using microwaves in the frequency range 2 to 4 GHz. The afterglow plasmas were produced by high voltage dc pulses across electrodes in cylindrical discharge tubes located in S-band waveguides. Peak electron densities are measured utilizing the electroacoustic resonances. These are compared with those measured simultaneously using the microwave cavity perturbation technique. The nonlinear interaction of the transverse electromagnetic waves with the inhomogeneous plasma is probed as the excitation signal strength is increased from microwatts to hundreds of milliwatts. The second harmonic amplitude of the signal emitted from the plasma column when excited at plasma resonance is probed as a function of the excitation field strength and also as the gas pressure is varied. Author Modified Abstract

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE