Speaker
Description
With the EuPRAXIA@SPARC_LAB launched at LNF-INFN as scheduled, the LLRF systems at SPARC_LAB are undergoing some major upgrades to support the cutting-edge research of plasma wakefield accelerations. The demanding requirements for RF stability of particle-driven plasma wakefield acceleration are on the edge of the state of the art, which imposes a big challenge to the synchronization of the RF subsystems. The S-band power station currently in operation contributes to the most RF phase jitters to the facility, because of the nature of the PFN modulators. One feasible solution to tackle this problem is a fast phase feedback loop to stabilize the phase. To evaluate and analyze this feedback system, two sets of measurements were carried out. First, a long-term test was performed using the existing loop, confirming its ability to operate stably over 8 hours without intervention. Subsequently, an upgraded version of the loop was developed, adding features such as remote gain control and addressing known limitations of the original design. Short-term measurements were carried out to test these enhancements. The upgraded system demonstrated stable and precise gain control, and the phase jitter was successfully reduced to 15 fs RMS. This marks a notable improvement over the original setup and makes a meaningful step toward meeting the strict RF stability requirements of advanced plasma accelerators.
| Abstract Category | Timing and Synchronization |
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