Accession Number : AD0271764

Title :   COULOMB COLLISIONS IN STRONG RF ELECTRIC FIELDS

Corporate Author : CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB

Personal Author(s) : AUGUST,G.

Report Date : 24 AUG 1961

Pagination or Media Count : 1

Abstract : An expression was derived for the electron-ion collision frequency in rf electric fields. The rf collision frequency is nearly given by Spitzer's usual collision frequency formula, when the temperature is modified to include the rms electron energy. The expression depends on the electronion scattering interaction time being small compared to one rf period. It normally applies only to strong rf electric fields, but under some circumstances it also applies to weak rf electric fields. The derivation is non-relativistic and so applies only to a range of rf electric field strengths. Rf power losses are calculated assuming that multiple Coulomb collisions are the dominant loss mechanism. When heating is neglected, the rf power loss for the strong rf electric field case becomes substantially independent of rf power level. For plane waves propagating through plasmas, the rf losses actually decrease as the rf power level increases. For devices employing reflection of plane waves from plasmas, the rf power loss is approximately given by using an electric field strength corresponding to the electron's rf velocity being twice its thermal velocity, and using the thermal collision frequency. (Author)

Descriptors :   *ELECTROMAGNETIC RADIATION, *ELECTRONS, *GAS IONIZATION, *IONS, *PLASMAS(PHYSICS), *QUANTUM THEORY, ELECTRIC FIELDS, HEATING, MAGNETIC FIELDS, PARTICLES, PROPAGATION, SCATTERING, VELOCITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE