Speaker
Description
FCC-ee requires a collimation system to isolate unavoidable beam losses and reduce particle backgrounds in the detectors, and to protect the machine in case of excessive beam losses from unstable or mis-steered beams at stored energies of 17.5MJ. The system is composed of primary and secondary collimators for betatron and momentum collimation, which will be located in one of the technical insertions of the 91 km ring, along with additional collimators and masks upstream of IPs to absorb syncrotron radiation, and additional injection and extraction protection devices, totalling over 100 individual devices for the final machine.
This presentation will provide an overview of current and upcoming work on the design for the FCCee collimators. Preliminary designs for primary and secondary collimators are underway. To maintain resilience against fast beam losses, replaceable collimator jaws and/or absorber blocks are considered for certain devices to reduce both machine downtime and cost. Moreover, tiltable jaws are considered, as this function could potentially improve the collimation efficiency. Studies on heating and deformation from energy deposited by the beam halo, endurance to beam impact and impedance optimisation are planned in the near future.
