Abstract
The objective of this program is to develop a microwave amplifier or oscillator capable of producing 200 kW CW power output at 28 GHz. The use of the gyrotron or cyclotron resonances interaction is being pursued. During this quarter, rebuilding of the second CW oscillator was accomplished. The tube was shipped to Oak Ridge, and considerable operation was realized at power levels up to 50 kW CW. This included operation heating a plasma load in EBT. Construction of the third CW oscillator was completed. Design changes and test results are described. The design changes did not result in significantly improved performance. Alternative output coupling schemes were studied with emphasis on axisymmetric coupling straight through 5 in. or 2.5 in. beam collectors. Computer simulation was used to analyze beam power distribution in the collector regions.
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