研究目的
To achieve reliable field emitter (FE) cathode operation for high current electron beam generation in RF microwave devices and address the challenges currently limiting the use of cold cathodes in today’s microwave systems.
研究成果
The presentation describes progress to date and challenges associated with implementation of field emitter cathodes in vacuum electronics devices for use in real-world systems. Further emittance reduction efforts are underway to enable operation into the mm-wave regime.
研究不足
The inherently high emittance of a field emitter array electron beam is the greatest impediment to operation in the mm-wave regime. Further emittance reduction efforts are needed to reduce emittance values to levels at or below those of thermionic cathodes while still retaining high current capability.
1：Experimental Design and Method Selection:
The study involves testing of cold cathode traveling wave tubes, high average power cathode-only testing, and evaluating cathode emission variation over long operating periods in a microwave device vacuum environment.
2：Sample Selection and Data Sources:
High reliability SRI cathodes were used for testing.
3：List of Experimental Equipment and Materials:
Water-cooled high power test bed with depressed collectors for high duty cold cathode testing.
4：Experimental Procedures and Operational Workflow:
Operation at high average beam power is required, with the cathode supplying on the order of 100 mA current and operating at duty factors up to 100%.
5：0%. Data Analysis Methods:
5. Data Analysis Methods: The study includes measuring cathode current variation during TWT processing and life tests and calculating peak PPM magnetic field required for operation at W-Band frequencies vs. beam rms emittance.
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