Speaker
Description
In the Hard X-ray Free Electron Laser (SHINE), the normal-conducting L-band buncher is critical for compressing electron bunches, significantly improving beam quality to meet stringent low-emittance and low-energy-spread injection requirements. Due to its 2-cell structure, a digital LLRF control system which based on an FPGA and RF front-end architecture using I/Q demodulation was designed. This system implements amplitude/phase feedback, frequency tuning, and multi-motor coordination for field flatness control. During 10kW continuous-wave (CW) operation the amplitude stability (peak-to-peak) improved from ±0.17% in open-loop to within ±0.03% under closed-loop, while the phase stability (peak-to-peak) was controlled within ±0.05°,and field flatness was maintained within ±2%, fully meeting design specifications. This achievement is critical for ensuring high-stability accelerator operation.
| Abstract Category | Hardware |
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