FCC-hh Experimental Insertion Region Design

TL;DR

This paper presents initial design concepts for the FCC-hh collider's experimental insertion regions, addressing key challenges like high collision debris, beam interactions, and background noise, with an alternative design avoiding crab cavities.

Contribution

It introduces the first comprehensive insertion region designs for FCC-hh, assessing major challenges and proposing an alternative layout without crab cavities.

Findings

Collision debris power two orders of magnitude higher than current colliders

Designs account for beam-beam interactions and synchrotron radiation backgrounds

An alternative insertion region design reduces reliance on crab cavities

Abstract

The Future Circular Collider study is exploring possible designs of circular colliders for the post-LHC era, as recommended by the European Strategy Group for High Energy Physics. One such option is FCC-hh, a proton-proton collider with a centre-of-mass energy of 100 TeV. The experimental insertion regions are key areas defining the performance of the collider. This paper presents the first insertion region designs with a complete assessment of the main challenges, as collision debris with two orders of magnitude larger power than current colliders, beam-beam interactions in long insertions, dynamic aperture for optics with peak $\beta$ functions one order of magnitude above current colliders, photon background from synchrotron radiation and cross talk between the insertion regions. An alternative design avoiding the use of crab cavities with a small impact on performance is also presented.