Concurrent Operation of Round Beam and Flat Beam in a Low- Emittance Storage Ring

In 4th-generation storage rings, whether to operate the beam as round or flat is a critical question. A round beam has equal horizontal and vertical emittances, and is an efficient solution to reduce strong intra-beam scattering effects and lengthen the Touschek lifetimes, but a flat beam produces a brighter photon beam than a round beam. To provide both beams concurrently rather than bifurcating the beam time, this paper presents cutting-edge hardware that supports concurrent operation of round beam and flat beam.