Abstract
We discuss beam dynamics issues in CEPC/FCC-ee, especially focusing on the beam–beam and electron cloud effects. Beamstrahlung is strong in extreme high energy collision such as Higgs and top factory. Beam–beam simulations considering beamstrahlung are now ready. Several points of beam–beam effects for FCC-ee are presented. Electron cloud effects are serious for high current positron machine, especially in Z factory that many bunches are stored. Analytical estimate for threshold of electron density and electron build-up for CEPC are presented.
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