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TY - UNPB AU - Wang, H.B. AU - Chen, D.Y. AU - Ma, X. AU - Wen, W.Q. AU - Yuan, Y.J. ED - Kuzin, Maxim TI - Simulation of Bunched Schottky Spectrum for Laser-Cooled O⁵⁺ Ions at CSRe 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 - Laser cooling of O⁵⁺ ion beams with an energy of 275.7 MeV/u was successfully achieved at the storage ring CSRe in Lanzhou, China. In order to explain the experimental results, by employing the multi-particle tracking method we made simulations of the bunched Schottky spectrum of O⁵⁺ ions with and without laser cooling. In the simulation, both of the transverse oscillation and the photon-ion resonant interaction process are considered while intra beam scattering is ignored. For bunched ion beams without laser cooling, the power of the central peak is about several orders of magnitude larger than that of the sideband peaks, which was called the "coherent effect". The simulation systematically studied the relationship of the Schottky power and the ions number at different observation harmonics and make clear about this ’coherent effect’ for the first time. For laser-cooled bunched ion beams, with more ions laser-cooled to center of the bucket, the distribution of the Schottky spectrum becomes narrower than that of the uncooled ion beams. However, the simulated bunched Schottky spectrum for laser-cooled ion beams shows strong sidebands at the position where laser resonant interacts with ions. The reason is that the beta-oscillation in the laser cooling straight section is simplified by using a mean betatron-function value. The further simulation is in progress. With this simulation, the dynamics for the laser cooling of bunched ion beams are fully understood for the first time. PB - JACoW Publishing CP - Geneva, Switzerland ER -