Publications by Douglas Bett

Bunch-by-bunch position and angle stabilisation at ATF based on sub-micron resolution stripline beam position monitors

IPAC 2016 - Proceedings of the 7th International Particle Accelerator Conference (2016) 3859-3861

NB Kraljevic, RM Bodenstein, T Bromwich, PN Burrows, GB Christian, MR Davis, C Perry, R Ramjiawan, DR Bett

Copyright © 2016 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 to drive a beam stabilisation system. The fast analogue front-end signal processor is based on a single-stage radio-frequency down-mixer, with a measured latency of 16 ns and a demonstrated single-pass beam position resolution of below 300 nm using a beam with a bunch charge of approximately 1 nC. The BPM position data are digitised on a digital feedback board which is used to drive a pair of kickers local to the BPMs and nominally orthogonal in phase in closed-loop feedback mode, thus achieving both beam position and angle stabilisation. We report the reduction in jitter as measured at a witness stripline BPM located 30 metres downstream of the feedback system and its propagation to the AT F interaction point.

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