Accession Number : AD0702143

Title :   A STUDY OF TURBULENCE AND THE INTERACTION OF ELECTROMAGNETIC WAVES WITH A TURBULENT IONIZED GAS.

Descriptive Note : Final scientific rept. 15 Nov 65-15 Nov 68,

Corporate Author : MIDWEST APPLIED SCIENCE CORP WEST LAFAYETTE IND

Personal Author(s) : Cottingham,William B. ; Groves,Richard N. , Jr. ; Wheeler,J. Ladd ; Davis,Daniel E.

Report Date : 15 DEC 1968

Pagination or Media Count : 66

Abstract : The effect of gas convection and turbulence on microwave breakdown power and on the diffusion of electrons in weakly ionized plasmas was studied for pulsed microwaves in nitrogen, argon, and air in a tube placed along the E field of an S-band waveguide. A new interpretation of the mechanisms which require increased and/or decreased microwave power for breakdown with increased gas flow velocities is presented. This interpretation seems to yield better agreement with the experimental data than theories previously reported in the literature. A secondary plateau above the free diffusion limit is observed in air. Only small differences between the power required for breakdown and maintenance are indicated because of the pulsed nature at the field. A new space-varying diffusion theory is formulated to extend the effective diffusion coefficient concept. (Author)

Descriptors :   (*ELECTROMAGNETIC RADIATION, INTERACTIONS), (*PLASMA SHEATHS, *TURBULENCE), RADIO WAVES, PROPAGATION, REENTRY VEHICLES, GAS IONIZATION, DIFFUSION, MICROWAVES, WAVEGUIDES

Subject Categories : Plasma Physics and Magnetohydrodynamics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE