Author: Preston, S.
Paper Title Page
WEP37 Measurements for Emittance Feedback based on Resonant Excitation at Diamond Light Source 492
  • S. Preston, L. Bobb, A.F.D. Morgan, T. Olsson
    DLS, Oxfordshire, United Kingdom
  In the Diamond storage ring, the vertical emittance is kept at 8 pm rad by an emittance feedback which modifies the strengths of skew quadrupoles. A new feedback using a stripline kicker to control the vertical emittance by exciting the beam resonantly at a synchrotron sideband is planned to avoid modification of the optics. This is crucial for the anticipated Diamond-II upgrade of the storage ring, which will have a much smaller equilibrium emittance than the existing machine. A larger coupling is therefore needed to keep the vertical emittance at the same level, potentially reducing the off-axis injection efficiency and lifetime. Measurements of the beam oscillation and emittance have been performed at the existing storage ring to characterise the effects of chromaticity and impedance on the optimal excitation frequency, where the emittance is increased significantly while the beam oscillation is kept low. The implications for simulating the emittance feedback for the Diamond-II storage ring are also discussed.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-WEP37  
About • Received ※ 02 September 2022 — Revised ※ 12 September 2022 — Accepted ※ 16 September 2022 — Issue date ※ 30 November 2022
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