Speaker
Description
The new FCC-ee injector complex design, as outlined in the feasibility report, consists of an electron source, two separate linacs for electron and positron beams to accelerate beams up to 2.86 GeV, a positron production target, a damping ring at 2.86 GeV energy for emittance cooling, a bunch compressor, a high energy linac to accelerate the beam up to 20 GeV, and an energy compressor.
The primary function of the damping ring design is to accept the 2.86 GeV positron and electron beams coming from the electron linacs, reduce their beam emittances, and deliver the required beam quality for injection into the subsequent high-energy linac. It is essential for decreasing the emittance of the incoming positron beam from 2.36x10^-6 m.rad to about 1.8x10^-9 m.rad. Among the collective effects that may limit the performance of the positron rings, the electron cloud (e-cloud) effect remains one of the most significant challenges. This paper presents the results of updated studies of the e-cloud impact on various damping ring design options for the FCC-ee, including the latest version introduced in the FCC-ee feasibility report.
Funding Agency
TENMAK under project number 2025TENMAK(CERN)A5.H3.F2-09
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