c. Heat pipes needed for transfer of heat to the radiator surface; study and development required. d. Operating frequency can be 1 GHz - 30 GHz; 2.45 GHz is good. e. Solenoid focusing and power outputs of 48 kW or greater, with output power dividers to the waveguide. f. Collector depression needed for highest efficiency; requires further study to determine practicality of reaching 80 percent. g. Five-stage design including a second harmonic bunching cavity to reduce noise bandwidth. h. Open tube construction, possibly with contaminant baffle, for higher reliability, simple thermal control, and lower weight. i. Parallel operation to minimize failure effects and simplify con- pensation for phase shift variations with voltage changes.
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