Performance of the diamond-based beam-loss monitor system of Belle II

• DOI: 10.1016/j.nima.2021.165157
• Publication Date: 2021-02-18T03:03:43Z
• Authors: S. Bacher; G. Bassi; L. Bosisio; G. Cautero; P. Cristaudo; M. Dorigo; A. Gabrielli; D. Giuressi; K. Hara; Y. Jin; C. La Licata; L. Lanceri; R. Manfredi; H. Nakayama; K.R. Nakamura; A. Natochii; A. Paladino; G. Rizzo; L. Vitale; H. Yin
• Keywords: Radiation monitoring; Physics - Instrumentation and Detectors; FOS: Physical sciences; Diamond sensor; Instrumentation and Detectors (physics.ins-det); sCVD diamond sensor; Beam-loss monitoring; Accelerator interlocks; Diamond sensor; Radiation monitoring;; Accelerator interlocks; Beam-loss monitoring; sCVD diamond sensor; 01 natural sciences; Accelerator interlock; 0103 physical sciences; Beam-loss monitoring; sCVD diamond sensor

We designed, constructed and have been operating a system based on single-crystal synthetic diamond sensors, to monitor the beam losses at the interaction region of the SuperKEKB asymmetric-energy electron-positron collider. The system records the radiation dose-rates in positions close to the inner detectors of the Belle II experiment, and protects both the detector and accelerator components against destructive beam losses, by participating in the beam-abort system. It also provides complementary information for the dedicated studies of beam-related backgrounds. We describe the performance of the system during the commissioning of the accelerator and during the first physics data taking.