Accession Number : AD0652417

Title :   GIGAHERTZ RADIATION FROM MAGNETIC-FIELD-FREE ELECTRON-HOLE PLASMAS,

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH PLASMA PHYSICS LAB

Personal Author(s) : Ancker-Johnson,Betsy

Report Date : MAR 1967

Pagination or Media Count : 51

Abstract : The study shows that gigahertz radiation is emitted from electron-hole plasmas in p-InSb at 77 K whose only external influence is an applied voltage. In order to satisfy the conditions for radiation the plasma must have a conductance which falls within a limited range. The appropriate plasma conductances require unusually high average electric field strenths E with attendant low average current densities J. The area of the J - E plane associated with radiation is accessible only with plasmas produced in high quality InSb. More conductance conditions necessary for radiation become accessible by applying a staircase voltage function instead of the usual squarewave because plasma is accumulated from step to step. Some properties of the radiation are described such as its extreme sensitivity to plasma conductance, its decay characteristics, and a possible correlation between radiation amplitude and current level. The radiation is also observed at current levels which are far above its current threshold. Many data obtained by fulfilling the necessary conditon for radiation, an appropriate range of plasma conductance, are summarized. (Author)

Descriptors :   (*MICROWAVES, *PLASMAS(PHYSICS)), ELECTRICAL CONDUCTIVITY, STABILITY, FREQUENCY, ISOTOPES, SCATTERING, ELECTRONS, HALL EFFECT, EXCITATION, PHONONS, DENSITY, VOLTAGE, RESISTORS, OSCILLOSCOPES, CRYOGENICS, MAGNETIC FIELDS

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE