Speaker
Description
Strong suppression of beam instabilities and real-time betatron tune monitoring are crucial for the 4th-generation light source, SPring-8-II. We developed a transverse Bunch-by-Bunch Feedback (TBBF) and a real-time betatron tune monitor based on the AMD RFSoC platform to replace the current legacy systems. Integrating ADCs/DACs, an FPGA, and ARM processors, the RFSoC enables low-latency processing and seamless integration into the accelerator control system. The TBBF performance was validated via beam studies at the SPring-8 storage ring. Grow-damp experiments showed a damping rate of 10 ms⁻¹, which meets the requirement for SPring-8-II. Furthermore, a high single-bunch current of 7 mA was successfully stored with the TBBF, which is 2.5 times higher than that without the feedback. These results show this TBBF is promising to be applicable to SPring-8-II. The RFSoC’s Real-time Processing Unit embeds a phase-locked loop (PLL) for automatic betatron tune tracking. It locks the 90-degree phase difference between a forced-oscillated bunch and its excitation source. This approach was validated against the conventional sweep method, showing high consistency with 10⁻³ precision. We demonstrated the PLL successfully tracks betatron tune shifts when varying the quadrupole magnet parameters. The real-time monitor has the potential for tune feedback to stabilize the ring's operating point.
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