THYAT0103
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
In the framework of the design and realization of a lepton collider, positron sources are essential due to the challenging critical requirements of high-beam intensity and low emittance necessary to achieve high luminosity. In the case of positron beams to be injected into circular colliders, the main concern is an optimized 6D emittance, whereas very high intensities are required for linear colliders. These constraints about intensity and emittance have strong consequences on the heat load and reliability of the targets. The high-luminosity circular collider FCC-ee will need a low-emittance positron beam with high enough intensity to shorten the injection time. A positron bunch intensity of about 3.5·1010 particles is required at the injection into a booster ring. Due to the large 6D production emittance and target thermal load, the positron injector, in particular positron generation, capture and damping, is one of the key elements of the FCC-ee, requiring special attention. Thus, the current studies of the FCC-ee positron source highlighting main requirements and constraints are presented.
