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TY - CONF AU - Sannibale, F. AU - Leemann, S.C. AU - Nishimura, H. AU - Robin, D. AU - Steier, C. AU - Sun, C. AU - Venturini, M. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Compensation of Insertion Device Induced Emittance Variations in Ultralow Emittance Storage Rings J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - With the advent of multi-bend achromat lattices, extremely low emittances are to become the norm in storage ring-based X-ray photon sources. In these lattices, the ratio of beam energy lost to radiation in the Insertion Devices (IDs) to the overall beam energy loss is relatively larger than in 3rd generation light sources. As a result, these machines are more sensitive to the energy loss variations occurring as the users operate variable-gap IDs and to the concurrent variations in radiation damping time, equilibrium emittance, and ultimately transverse properties of the beam. With possibly tens of variable gap IDs continuously and independently varying their gaps to meet the experiment needs, the resulting variation in emittance and beam sizes can be significant and can jeopardize the experimental performance in some of the beamlines. In this paper we describe and discuss possible methods for compensating such emittance variations and maintaining constant transverse beam properties for the experiments. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1751 EP - 1754 KW - emittance KW - wiggler KW - lattice KW - electron KW - photon DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-WEXGBE2 UR - http://jacow.org/ipac2018/papers/wexgbe2.pdf ER -