A Feasibility Study of an e+e- Ring Collider for Higgs Factory

TL;DR

This study explores the feasibility of constructing a ring-based Higgs factory in the LEP tunnel, emphasizing low-emittance lattice design and simplified focusing to achieve high luminosity at 240 GeV.

Contribution

It presents a concrete lattice design and innovative focusing system improvements for a Higgs factory in an existing tunnel, demonstrating technical feasibility.

Findings

Achieved a luminosity of 1.0×10^{34} cm^{-2}s^{-1}

Enhanced momentum aperture by a factor of 5 to 2.5%

Highlighted the importance of low-emittance lattice for beam lifetime

Abstract

A ring-based Higgs factory with a center-of-mass energy of 240 GeV residing in the existing LEP tunnel is studied at a level of concrete lattice. We found that low-emittance lattice is essential to mitigate the effect of beamstrahlung on the beam lifetime. To achieve a luminosity of $1.0\times10^{34}{\rm cm}^{-2}{\rm s}^{-1}$, we simplified final focusing system and improved its momentum aperture by a factor of 5 to 2.5%.