Publications by Douglas Bett

Development of a low-latency, high-precision, intra-train beam feedback system based on cavity beam position monitors

IPAC 2014: Proceedings of the 5th International Particle Accelerator Conference (2014) 2783-2785

N Blaskovic Kraljevic, DR Bett, PN Burrows, GB Christian, MR Davis, YI Kim, C Perry

Copyright © 2014 CC-BY-3.0 and by the respective authors. A low-latency, intra-train, beam feedback system utilising a cavity beam position monitor (BPM) has been developed and tested at the final focus of the Accelerator Test Facility (ATF2) at KEK. A low-Q cavity BPM was utilised with custom signal processing electronics, designed for low latency and optimal position resolution, to provide an input beam position signal to the feedback system. A custom stripline kicker and power amplifier, and an FPGA-based digital feedback board, were used to provide beam correction and feedback control, respectively. The system was deployed in single-pass, multi-bunch mode with the aim of demonstrating intratrain beam stabilisation on electron bunches of charge ∼1 nC separated in time by c. 280 ns. The system has been used to demonstrate beam stabilisation to below the 100 nm level. Results of the latest beam tests, aimed at even higher performance, will be presented.

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