Radiation Monitoring with Diamond Sensors for the Belle-II Vertex Detector

TL;DR

This paper discusses the design, calibration, and initial performance of a diamond sensor-based radiation monitoring system for the high-luminosity Belle-II detector at SuperKEKB, ensuring safe operation in a harsh environment.

Contribution

It introduces a novel radiation monitoring system using diamond sensors for the Belle-II VXD, including calibration procedures and initial performance results.

Findings

Successful deployment of 20 diamond sensors near the VXD

Effective calibration procedures established for sensors

Prototype system performed well during initial commissioning

Abstract

The Belle II detector is currently under construction at the SuperKEKB electron-positron high-luminosity collider, that will provide an instantaneous luminosity 40 times higher than that of KEKB. There- fore the Belle-II VerteX Detector (VXD) will operate in a very harsh environment. A radiation monitoring and beam abort system is needed to safely operate the VXD detector in these conditions. This system is based on 20 single crystal CVD diamond sensors placed in 20 key positions in the vicinity of the VXD and interaction region. In this contribution we describe the system design and we present the procedures followed for the characterisation and calibration of the diamond sensors. We discuss also the performance of the prototype system during the first SuperKEKB commissioning phase in February-June 2016.