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Final design and assembly are in progress for a 2 MW CW RF load for gyrotrons. Such loads are required for testing high power gyrotrons for electron cyclotron heating of fusion plasmas. The research is building on experience with a 1 MW load to increase the power capability, reduce backscattered RF power, and improve the mechanical design.
Several magnetron injection gun cathodes have been measured for temperature and emission uniformity. The measurements confirm results in Russia that the quality of many MIG cathodes is not sufficient for efficient gyrotron operation. This presentation will present recent cathode measurements and identify known issues. A design will be presented that provides a solution for several of these issues.
Magnetron injection guns (MIGs) are a principle component in gyrotrons and gyroklystrons. The performance of the RF device critically depends on the performance of the MIG that provides the electron beam. Unfortunately, recent measurements indicate that MIGS often generate asymmetrical electron beams that can adversely impact the operation of the RF source. This presentation will describe the measurement...
Recent gyrotron operations indicate that nonuniform cathode emission is prevalent in many, if not most, magnetron injection guns. A nonuniform emission can result in degradation of the RF performance and increase heating in the collector. This paper describes research to improve cathode emission by addressing temperature uniformity and work function issues. A new cathode design is proposed, and a...
All efficient, vacuum, RF sources required a high quality electron beam for efficient interaction. Non uniform cathode emission occurs when either the temperature or the work function varies over the cathode surface. If the non-uniformity exceeds certain limits, the RF source cannot perform according the specifications. Magnetron injection guns for gyrotrons were built that separate the emission surface...
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