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Description
In accelerator complexes with electron cooling systems, minimizing of beam emittance is a critical factor determining the maximum cooling rate and efficiency of the process. For numerical simulations, mathematical models of the beam transport channel from the Linac to the Booster and the Booster are used. Matching of the beta functions at the boundary is achieved by adjusting the currents in the quadrupole lenses of the transport channel. A controlled optics mismatch is introduced by varying the strengths of these lenses. The observed increase in emittance allows to evaluate the quality of the channel optics tuning. The electron cooling system introduces additional coupling of motions which also leads to an increase in emittance. The results of this work are graphs of dependencies: (1) emittance growth as a function of the degree of optics mismatch; and (2) emittance growth as a function of optics mismatch in the presence of transverse motion coupling. The obtained dependencies allow to identify operational regimes where emittance growth is minimized, make it possible to precisely optimize the optical settings to minimize the emittance of the injected beam.
