An SLC-type $e^{+}{e}^{-}/\gamma \gamma$ facility at a Future Circular Collider

Abstract

It is proposed to place the arcs of an SLC-type facility inside the tunnel of a Future Circular Collider (FCC). Accelerated by a linear accelerator (linac), electron and positron beams would traverse the bending arcs in opposite directions and collide at centre-of-mass energies considerably exceeding those attainable at circular $e^{+}{e}^{-}$ colliders. The proposed SLC-type facility would have the same luminosity as a conventional two-linac $e^{+}{e}^{-}$ collider. Using an optical free-electron laser, the facility could be converted into a $\gamma \gamma$ collider. A superconducting L-band linac at the proposed facility may form a part of the injector chain for a 100-TeV proton collider in the FCC tunnel. The whole accelerator complex would serve as a source of $e^{+}{e}^{-}$, $\gamma \gamma$, $pp$ and $ep$ interactions. The L-band linac could also be used to produce high-intensity neutrino, kaon and muon beams for fixed-target experiments, as well as X-ray free-electron laser (XFEL) photons for applications in material science and medicine.

16 pages, 7 figures. arXiv admin note: substantial text overlap with arXiv:1208.4956, arXiv:0810.3187

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