Luminosity performance of SuperKEKB

TL;DR

This paper reviews the luminosity performance of SuperKEKB from 2020 to 2022, highlighting the impact of beam-beam interactions and the crab waist scheme on achieving record luminosity levels.

Contribution

It provides an analysis of luminosity tuning strategies and the effects of beam-beam interactions in SuperKEKB's crab-waist operation, contributing to understanding high-luminosity collider performance.

Findings

SuperKEKB achieved a luminosity record of 4.71 x 10^{34} cm^{-2}s^{-1} in June 2022.

Beam-beam interactions significantly influence luminosity limits and vertical beam blowup.

Luminosity performance improved over time with optimized tuning under crab-waist scheme.

Abstract

Since April 2020, the SuperKEKB has been operating with the crab waist scheme. The luminosity record achieved in June 2022 was $4.71 \times 10^{34} \text{ cm}^{-2}\text{s}^{-1}$, which overtook its predecessor KEKB by more than a factor of 2. The beam-beam interaction plays a key role in causing vertical blowup and consequently limiting the luminosity performance of SuperKEKB. In this paper, we examine luminosity tunings under the influence of beam-beam effects and review the luminosity performance of SuperKEKB with the crab-waist operation from 2020 to 2022.