STUDY OF MICROWAVE GENERATION UTILIZING DOUBLE-STREAM INSTABILITIES IN ANISOTHROPIC MEDIA.
Quarterly progress rept. no. 9, 1 Jan-31 Mar 66,
MICROWAVE ELECTRONICS PALO ALTO CALIF
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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 ampsq 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 ampsq 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
- Electrical and Electronic Equipment
- Plasma Physics and Magnetohydrodynamics