STUDY OF MICROWAVE GENERATION UTILIZING DOUBLE-STREAM INSTABILITIES IN ANISOTHROPIC MEDIA.

Abstract

The computer results for the two-stream instability in pyrolytic graphite (PG) and bismuth (Bi) have been obtained. The instability frequency for the acoustical mode in the optimum crystalline direction (trigonal) is approximately 500 GHz wavelength = 0.6 mm) at the frequency of maximum growth rate. The current density required at the threshold of the instability is approximately 15 amp/sq mil. For PG, the corresponding frequency and current density requirement in the a-plane is 3 x 13 to the 13th power cps (wavelength = 10 microns) and 35 amp/sq mil. Experiments with PG samples of larger cross-sectional area have been unsuccessful even though the detection system sensitivity has been improved. Further experiments will be concentrated in Bi using an indium antimonide submillimeter detector operating at liquid helium temperature. (Author)

Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1966
Accession Number
AD0640417

Entities

People

  • L. D. Buchmiller
  • S. Kakihana

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Antimonides
  • Computers
  • Current Density
  • Demographic Cohorts
  • Detection
  • Detectors
  • Frequency
  • Graphitic Materials
  • Indium
  • Indium Antimonides
  • Instability
  • Microwaves
  • Sensitivity

Fields of Study

  • Physics

Readers

  • Organic Chemistry
  • Plasma Physics / Magnetohydrodynamics
  • Semiconductor Device Technology