d. Operating frequency 1. 5 GHz to 3. 0 GHz; 2. 45 GHz preferred. e. Power added 5 kW to 10 kW per tube; 5 kW preferred. f. Efficiency with rf noise and harmonic filters is conservative 85%; improvement to 90% is a realistic goal. g. Cascade configuration because of low gain characteristics. h. Regulation of constant current or constant phase by movable pole piece or impulse magnet technique for high efficiency. i. Open tube construction, possibly with contaminant baffle, for higher reliability, simple thermal control and lower weight. For the klystron concept: j . Hot cathode design used in study, but a cold cathode development desirable for longer life. k. Pyrolytic graphite radiators for efficient heat radiation. 1. Heat pipes needed for transfer of heat to the radiator surface; study and development required. m. Operating frequency can be 1 GHz - 30 GHz; 2. 45 GHz is good. n. Solenoid focusing and power outputs of 48 kW or greater, with output power dividers to the waveguide. o. Collector depression needed for highest efficiency; requires further study to determine practicality of reaching 80%. p. Five-stage design including a second harmonic bunching cavity to reduce noise bandwidth. q. Open tube construction, possibly with contaminant baffle, for higher reliability, simple thermal control and lower weight. r. Parallel configuration.
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