Speaker
Description
The FCC-ee injector complex is mainly composed of an electron source, a positron source, a damping ring, and a high-energy linac. The positron linac, which is part of the positron source, accelerates the positron beams from about 200MeV to 2.86 GeV before their injection to the damping ring. It is designed, simulated and optimized for the best positron beam performance at the end of the linac with a maximized positron yield for positrons accepted by the damping ring. The required bunch charge at the end of the Positron Linac is 13.5 nC, assuming a 50% loss in the damping ring and an additional loss of 20% positrons from the target exit to the damping ring entrance. A chicane collimator is used to dump electrons and photons from the upstream Capture Linac. The Positron Linac is composed of two sections, where NC solenoids surrounding the accelerating structures with 0.5 T magnetic field and FODO cells with quadrupoles placed between the structures are used for beam focusing. A 3 m long RF accelerating structure working at 2 GHz is used. RF gradients and phases are optimized for a maximum positron yield. Imperfections are studied and the impact is found to be small.
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