ONE WATT CW S-BAND TRAVELING WAVE TUBE WITH 6 DB NOISE FIGURE.
Interim rept. no. 2, Sep-Dec 63.
MICROWAVE ELECTRONICS PALO ALTO CALIF
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Objectives during this period were to evaluate Cathaloy A-33 as a cathode base material, find the effect of cathode activation and processing on noise figure, and make preliminary electron-gun evaluations at high current densities. Cathaloy A-33 exhibited excellent characteristics up to 900 hours life however, it does not appear to be superior to 220 Ni. Analysis of the effect of proper activation and processing of the cathode was started but not completed. More test vehicles are needed for proper evaluation. Tests on a low-voltage input helix were encouraging and a velocity taper on the output helix improved the saturated power output. An electron gun was scaled, utilizing the current density and voltage from a previous model, and the gun structure changed to allow closer spacing between electrodes. This gun is being fabricated and has not been tested. Author