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TY - UNPB AU - Seletskiy, S. AU - Fedotov, A.V. AU - Kayran, D. ED - Kuzin, Maxim TI - Theory and Observation of Circular Attractors in Cooled Ion Bunches J2 - Proc. of COOL2021, Novosibirsk, Russia, 01-05 November 2021 CY - Novosibirsk, Russia T2 - Workshop on Beam Cooling and Related Topics T3 - 13 LA - english AB - In electron coolers, under certain conditions, a mismatch in either gamma-factors or trajectory angles between an electron and an ion beam can cause formation of a circular attractor in the ion beam phase space. This leads to coherent excitations, rather than damping, of the ions with a small synchrotron or betatron amplitude and results in an unusual beam dynamics. In this paper we consider the effect of such coherent excitations, report the first observation of the circular attractor in a relativistic electron cooler and discuss the implications of this effect for high energy electron coolers proposed for the Electron Ion Collider (EIC). PB - JACoW Publishing CP - Geneva, Switzerland ER -