Mitigating performance limitations of single beam-pipe circular e+e- colliders

TL;DR

This paper analyzes the performance limitations of single beam-pipe circular e+e- colliders and proposes a solution to increase bunch capacity while maintaining most of the ring with a single beam pipe.

Contribution

It introduces a novel approach to mitigate bunch number limitations in single beam-pipe colliders, enabling O(1000) bunches with minimal beam pipe changes.

Findings

The proposed solution significantly increases bunch capacity.

More than 90% of the ring can remain with a single beam pipe.

Performance limitations are effectively addressed.

Abstract

Renewed interest in circular e+e- colliders has spurred designs of single beam-pipe machines, like the CEPC in China, and double beam pipe ones, such as the FCC-ee effort at CERN. Single beam-pipe designs profit from lower costs but are limited by the number of bunches that can be accommodated in the machine. We analyse these performance limitations and propose a solution that can accommodate O(1000) bunches while keeping more than 90% of the ring with a single beam pipe.