An experimental study of Tonks-Dattner resonances in rare gas plasmas.
Hart, David Austin
Oleson, Norman L.
MetadataShow full item record
A quantitative experimental study of the dipole Tonks-Dattner resonance oscillations of a cylindrical plasma column has been made for neon, argon and xenon plasma columns. Discharges were operated in the range of a few mTorr and resonances have been observed in the UHF and microwave frequency range. The resonances have been studied using strip-line and waveguide techniques and diagnostic studies have been made employing Langmuir probes and microwave cavity methods. For xenon, good agreement has been found with the theory of Parker, Nickel and Gould but for neon and argon definite discrepancies exist. This departure has been attributed to ion mean free paths which are not long compared to the tube radius. The effect of ion collisions seems to be to raise the electron density near the wall of the tube causing the resonances to occur at higher frequencies than are predicted by theory for the case of long ion mean free paths. The appearance of fewer and broader resonances than are observed in mercury columns is attributed primarily to the occurrence of moving striations which produce variations of electron density of about t 50% of the average.
Approved for public release; distribution unlimited.
Showing items related by title, author, creator and subject.
Glass, N.E. (American Physical Society, 1987-02-15);The diffraction of light of arbitrary polarization and arbitrary plane of incidence from a bigrating surface is described by an existing theory based on Rayleigh's method and the vectorial Kirchhoff integral. Its ...
E0, El, E2, E3, and E4 giant resonances in the N = 82 nucleus (140) Ce between 4 and 48 MeV excitation energy with inelastic electron scattering Pitthan, R.; Hass, H.; Meyer, D.H.; Buskirk, F.R.; Dyer, J.N. (American Physical Society, 1979-04);The cross section for electron scattering from natural cerium (89% 14°Ce) has been measured with electrons of 80 and 92 MeV at 90 and 105° between 4 and 48 MeV excitation energy. The nine resonances ...