RESEARCH AND DEVELOPMENT ON L-BAND CROSSED-FIELD AMPLIFIER CHAIN
Quarterly progress rept. no. 6, 1 Mar-1 Jun 1964
S F D LABS UNION NJ
Pagination or Media Count:
Life tests were continued on the Group C SFD-209 tubes. 4411 hours have been accumulated. Tubes L48E and L1E have operated 2150 and 1288 hours, respectively. L1E was damaged by an equipment failure and has been removed from life test for study. Degradation of performance was discontinouous and corresponded to equipment failure. To prevent future failures, the external circuitry has been improved and the final tubes modified. Tube L30E was used in an experiment designed to investigate the improvement of efficiency through improved confinement of electrons to the interaction space. A barreling magnetic field was used to improve magnetic confinement but no significant change in efficiency was observed. Further tests indicate that V-I characteristics will be quite reproducible from tube to tube. The sources of variations previously noted have been traced down and found to be external to the tube. The control electrode support and the input window have been redesigned. An attempt will also be made to incorporate preferential pi mode damping. by means of an absorber located behind the C13 couplers.
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