Apr 19 – 20, 2018
Diamond Light Source
Europe/London timezone

APS Upgrade Fast Orbit Feedback and Beam Stabilization R&D

Apr 20, 2018, 2:00 PM
G59 (Diamond Light Source)


Diamond Light Source

Diamond House, Harwell Campus, Didcot, OX11 0DE, United Kingdom
Oral Contribution Greater Context of Stability


Dr Glenn Decker (Argonne National Laboratory)


The APS upgrade entails a complete replacement of the APS storage ring with
a multi-bend achromat lattice, resulting in a reduction in natural
emittance by more than a factor of 50, nominally to 42 pm-rad. This will
reduce the horizontal beam size at insertion device source points to below
15 microns rms, and the vertical beam size to below 3 microns at 10%
coupling. An extensive R&D program was initiated in 2013 to address
limiting technologies supporting the APS-U, one such involving deployment
of a suite of diagnostic and feedback capabilities encompassing two sectors
of the present APS. This included 16 modernized sets of beam position
monitor (BPM) electronics, a high-power hard x-ray BPM, 8 prototype fast
steering corrector power supplies, a feedback controller operating at 22
kHz sample rate, in-tunnel hydrostatic floor level monitors, and capacitive
proximity sensors monitoring the horizontal and vertical displacement of
critical in-tunnel rf BPM pickup electrodes and x-ray BPM detectors. A
description of the instrumentation and summary of key results will be

Primary author

Dr Glenn Decker (Argonne National Laboratory)


Dr Nicholas Sereno (Argonne National Laboratory) Mr John Carwardine (Argonne National Laboratory) Mr Robert Lill (Argonne National Laboratory) Mr Ned Arnold (Argonne National Laboratory)

Presentation materials