Development and Implementation of Advanced Beam Diagnostic and Abort Systems in SuperKEKB

Abstract

The SuperKEKB/Belle II experiment aims to collect high-statistics data of B meson pairs to explore new physics beyond the Standard Model (SM). SuperKEKB, an upgraded version of the KEKB accelerator, has achieved a world-record luminosity of $4.71\times 10^{34}\mathrm{c}{\mathrm{m}}^{-2}{\mathrm{s}}^{-1}$ in 2022 but continues to strive for higher luminosities. One of the major obstacles is Sudden Beam Loss (SBL) events, which cause substantial beam losses and damage to the Belle~II detector. To find a hint for addressing SBL challenges, advanced beam diagnostic systems and enhanced beam abort systems have been developed. The diagnostic system aims to accurately pinpoint the start of beam losses, while the upgraded abort system quickly disposes of anomalous beams to minimize damage. This paper details the development and implementation of these systems, including high-speed loss monitors, time synchronization with the White Rabbit system, and data acquisition systems. Efforts to understand the mechanisms of SBL events, using acoustic sensors to detect discharges, are also discussed. These measures aim to improve the operational stability and luminosity of SuperKEKB, contributing to the experiment's success.

17 pages, 25 figures

References in corpus (7)

• The Belle II Physics Book
• Silicon Photomultipliers in Particle and Nuclear Physics
• The Touschek Effect in Strong Focusing Storage Rings
• Performance of the diamond-based beam-loss monitor system of Belle II
• Measured and projected beam backgrounds in the Belle II experiment at the SuperKEKB collider
• Calibration of diamond detectors for dosimetry in beam-loss monitoring
• A new electron-multiplier-tube-based beam monitor for muon monitoring at the T2K experiment

Cited by in corpus (1)

• A Collimation System Baseline Design for the Electron Storage Ring at the Electron-Ion Collider