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Description
The reliable operation of high-power RF components, such as input couplers and RF windows, is critical for the Circular Electron Positron Collider (CEPC) project. Prior to installation into the accelerator system, these components require rigorous high-power conditioning to verify their RF performance and thermal stability. However, establishing megawatt-level test facilities is challenging due to the complexity and limited availability of high-power RF sources. To address this issue, the Institute of High Energy Physics (IHEP) has developed a 650 MHz traveling-wave resonant ring (TWRR) system based on a WR1500 waveguide. This system incorporates an integrated phase-shifting and impedance-matching structure using a 3 dB hybrid coupler and dual short-circuit plungers, enabling efficient RF energy accumulation within a closed-loop configuration using a relatively low-power source. During high-power continuous-wave (CW) testing, the TWRR achieved a circulating power of approximately 1.2 MW with an injected power of only 42.7 kW, corresponding to a power gain exceeding 14 dB. The system maintained stable, uninterrupted CW operation for 8 hours, with real-time temperature and infrared thermography monitoring confirming effective thermal management. These results not only demonstrate the feasibility of MW-level CW conditioning using a TWRR but also establish a test platform for future CEPC high-power component validation and conditioning.
