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| MOPOTK006 |
Off-Energy Operation for the ESRF-EBS Storage Ring |
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- L. Hoummi, T. Brochard, N. Carmignani, L.R. Carver, J. Chavanne, S.M. Liuzzo, T.P. Perron, R. Versteegen, S.M. White
ESRF, Grenoble, France
- P. Raimondi
SLAC, Menlo Park, California, USA
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The ESRF-EBS is the first 4th generation source making use of the Hybrid Multi-Bend Achromat (HMBA) lattice cell, reaching an equilibrium horizontal emittance of 140 pm.rad in user mode (insertion devices (ID) gaps open). The injection in the storage ring (SR) is conducted with a short booster, operated off-energy. The RF frequency is increased compared to the nominal one to put the beam on a dispersive orbit, thus going off-axis in quadrupoles. The induced dipolar feed down effects reduce the booster horizontal emittance. The same strategy is extended to the ESRF-EBS SR, for an expected emittance reduction of about 20 pm.rad. A first approach shifts the RF frequency by +300 Hz to operate at -1% energy offset. Optimal quadrupole and sextupole settings are defined for this off-energy operation based on simulations. The settings are then tested in the SR in terms of dynamic aperture and injection efficiency.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOTK006
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| About • |
Received ※ 07 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 05 July 2022 |
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