The purpose of this program is to demonstrate the feasibility of generating very high power specifically, 100 kw .peak and 1000 watts average at 100 Gc. by means of an O type backward-wave oscillator operating at very high voltage. A disc-loaded waveguide which operates from 90 kv to 200 kv was selected as the circuit for the backward wave oscillator. A 900 to 1 convergence ratio electron gun was developed. This perveance 0.125 x 10 electron gun was focused through a .062" diameter beam hole with over 96 percent trans mission at 190 kc. The power density in the beam was 280 megawatts per square cm. Peak power of 107 kilowatts was measured using a calorimeter as a power standard. An average power of 324 watts was measured using the calorimeter. Both of these power levels exceed any other known values of power at a frequency of 100 Gc.
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