Speaker
Description
Beam-driven plasma wakefield accelerators impose extremely stringent requirements on RF phase stability to ensure reliable beam generation and synchronization. At SPARC_LAB, a fast RF feedback system has been developed for the S-band RF power plant to satisfy the facility's synchronization requirement of less than 20 fs RMS phase jitter with respect to the reference master oscillator (RMO). The feedback system has been in operation since 2008 and has undergone several generations of upgrades to improve its performance and robustness. This work presents the latest developments of the fast feedback system together with experimental results demonstrating its phase noise suppression capability on the S-band klystron. Measurements show that the residual RF phase jitter can be reduced to below 15 fs RMS with respect to the RMO. These results demonstrate that the upgraded S-band fast feedback system is capable of meeting the femtosecond-level synchronization requirements of advanced beam-driven plasma wakefield accelerator at SPARC_LAB.
| Abstract Classification | Control Loop Modeling, Tuning and Optimization |
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