KINETIC THEORY AND RELAXATION PROCESSES OF WEAKLY IONIZED GASES,
Abstract
An analytic method to calculate the electronic distribution function in weakly ionized plasma in equilibrium between Joule effect and elastic and inelastic collisions is presented. The results of experimental measurements of the recombination coefficients for plasmas induced by laser are compared with the theoretical ones given by Bates, et al, for hydrogen, after having made an extension of the helium gas. An experiment was conducted to determine the high frequency field influence on a plasma column (mercury vapor at a .001 Torr pressure and electronic density of the order of 10 to the 11th power/cc). The results are given in terms of the ionization of the plasma by the wave and the parametric generation of the low frequency wave. A finite plasma, having numerous resonance regions, behaves like a parametric amplifier when a small signal is applied on one of these resonances. An experiment is presented where a 2 mW signal at 2700 MHz is amplified with a power gain of 170, the band width being less than 1 MHz. The principles of the non-linear coherent interaction of two waves in a plasma were verified in the neighborhood of two resonances, cyclotron resonance and hybrid resonance. The non-linear effect could provide a diagnostic means. The density measurement of the central zone of the studied plasma was performed with a good precision. A new measuring device using three directional couplers and providing an easy way to measure the complex reflection and transmission coefficients of a two-terminal-pair structure is described. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1968
- Accession Number
- AD0670218
Entities
People
- A. Constantin
- E. Leibe
- J. Godart
- J. L. Delcroix
- M. Fitaire
Organizations
- University of Paris