Speaker
Description
A γ-γ collider has long been considered an option for a Higgs Factory. Such colliders rely on Compton back-scattering for generating γ photons. The present proposals all choose a thick laser target for scattering. In this paper, we present a new approach for a γ-γ collider utilizing a thin laser target and energy recovery linac for driving the electron beam. This new concept eliminates useless soft γ photons from multiple Compton scatterings. It also relaxes the requirement of an ultra-high peak power of the laser. A high integrated luminosity can be achieved through high bunch repetition rate and high average current of the electron beam enabled by energy recovery. Further, multi-pass recirculating linac could greatly reduce the linac cost. A preliminary conceptual design of ERL is also discussed.
