Publications by Douglas Bett

A sub-micron resolution, wide-band, stripline bpm system for driving bunch-by-bunch feed-back and feed-forward systems at ATF

IPAC 2014: Proceedings of the 5th International Particle Accelerator Conference (2014) 1358-1360

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

Copyright © 2014 CC-BY-3.0 and by the respective authors. A low-latency, sub-micron resolution stripline beam position monitoring (BPM) system has been developed and tested with beam at the KEK Accelerator Test Facility (ATF2), where it has been used as part of a beam stabilisation system. The fast analogue front-end signal processor is based on a single-stage RF down-mixer and a position resolution below 400 nm has been demonstrated for beam intensities of 1 nC, with single-pass beam. The BPM position data are digitised by fast ADCs on an FPGA-based digital feedback controller, which is used to drive either a pair of kickers local to the BPMs and nominally orthogonal in phase, in closed-loop feedback mode, or a downstream kicker in the ATF2 final focus region, in feedforward mode. The beam jitter is measured downstream of the final focus system with high resolution, low-Q, cavity BPMs, and the relative performance of both systems in stabilising the beam is compared.

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