SEMICONDUCTOR AND O-TYPE AMPLIFIER INVESTIGATIONS.
Quarterly progress rept. no. 5, 1 Sep-1 Dec 65,
MICHIGAN UNIV ANN ARBOR ELECTRON PHYSICS LAB
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Specific results on saturation gain and efficiency for Brillouin beam traveling-wave amplifiers are presented as a function of beam injection velocity and magnetic field strength,. It is found that the saturation gain and output are higher for the Brillouin-focused device than for the rectilinear-flow device. A perturbational analysis of the small-C nonlinear TWA equations was undertaken. Testing of the microperv gun was terminated due to the failure of its heater. The design of a device for determining the effect of large-amplitude r-f signals on an electron beam was completed. Errors in the space-charge calculations for high-convergence electron guns were corrected and as a result greater accuracy and agreement with experiments were obtained. Although improvements were made in the magnetron injection gun program, it is still difficult to obtain proper convergence in the vicinity of the cathode. A UHF helix-type traveling-wave amplifier with a magnetron injection gun was studied experimentally with regard to the noise characteristics of the gun and the beam in the interaction region. Reasonably low noise figures were obtained at reduced beam current and it is expected that lower noise figures will be realized when the amplifier is operated at rated current. Author
- Electrical and Electronic Equipment