# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## Status and perspectives of the SuperKEKB project

27 Jul 2021, 10:30
20m
Zoom

#### Zoom

Parallel session talk Accelerators for HEP

### Speaker

Yukiyoshi Ohnishi (BELLE (BELLE II Experiment))

### Description

The SuperKEKB electron-positron collider is being commissioned at KEK to study a new physics in the B-meson decays. In order to accomplish the target, the luminosity of 8 x 10$^{35}$ cm$^{-2}$s$^{-1}$ is necessary. We have applied a novel “nano-beam scheme” to squeeze the beta function at the interaction point (IP) down to 1 mm in the vertical, 60 mm in the HER and 80 mm in the LER in the horizontal direction, respectively. The beta function at the IP is the smallest value for the existing circular colliders in the world. However, the final design value is 0.3 mm which is about 1/3 of the achievement. Recently, we also applied a “crab waist collision scheme” to improve the luminosity in the nano-beam scheme. The status of the commissioning at 2020 run and 2021 run is presented and the performance of nano-beam scheme as well as the crab waist are discussed.

Collaboration / Activity SuperKEKB

### Primary authors

Yukiyoshi Ohnishi (BELLE (BELLE II Experiment)) Yukiyoshi Ohnishi (KEK)