研究目的
To develop high-power gyrotrons for electron-cyclotron-resonance heating and current drive in fusion reactors, focusing on increasing output power, efficiency, and operating frequency, particularly above 200 GHz, for future demonstration power plants like DEMO.
研究成果
The research demonstrates progress in developing high-power gyrotrons, with the coaxial cavity technology showing promise for higher frequencies and power levels. Key findings include achieving up to 2.2 MW output power at 170 GHz and initiating designs for multi-frequency operation above 200 GHz. The work supports future fusion power plants by addressing efficiency and frequency challenges, with recommendations for further validation of components and implementation of multi-staged depressed collectors.
研究不足
Technical constraints include limitations on cavity wall loading (< 2 kW/cm2), challenges in achieving long-pulse or continuous wave operation, and the need for improved electron beam quality. Potential optimizations involve developing multi-staged depressed collectors for higher efficiency and refining quasi-optical systems for better performance at higher frequencies.
1：Experimental Design and Method Selection:
The study involves designing and testing gyrotrons using both conventional hollow cavity and coaxial cavity technologies. Numerical simulations using codes like EURIDICE are employed to model beam-wave interactions and mode conversions.
2：Sample Selection and Data Sources:
Prototype gyrotrons (e.g., 170 GHz 2 MW coaxial-cavity gyrotron, 140 GHz
3：5 MW gyrotron) are used as test samples. Data is sourced from experimental measurements and simulations. List of Experimental Equipment and Materials:
Includes gyrotron components (e.g., electron guns, cavities, quasi-optical systems, CVD diamond windows), superconducting magnets, and test facilities like the FULGOR gyrotron teststand.
4：Experimental Procedures and Operational Workflow:
Steps involve assembling gyrotron prototypes, installing them in magnets, conducting short-pulse and long-pulse tests, measuring RF output power and efficiency, and optimizing parameters like magnetic field and beam current.
5：Data Analysis Methods:
Analysis includes numerical simulations for mode selection, efficiency calculations, and thermal loading assessments; statistical methods are not explicitly mentioned, but software tools like EURIDICE are used.
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