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Purpose: <p>This paper presents a distributed monitoring and control system for the Cylindrical Gas Electron Multiplier (CGEM) inner tracker at the Beijing Spectrometer III (BESIII). Built on a LabVIEW-based framework, the system provides real-time data acquisition, data archiving, alarm handling, and operator interfaces. A state-machine-based high-voltage (HV) control mechanism enforces deterministic power-up sequences tailored to detector requirements. A multi-level safety interlock integrates status information from detector subsystems and BESIII global safety signals to trigger graded protection actions, including alarms, controlled HV ramp-down, and emergency shutdown. The design emphasizes reliability, scalability, and maintainability.</p> Methods: <p>The HV control is implemented using a finite-state machine with decoupled core logic and configurable operational sequences. The interlock architecture consists of unit-level, system-level, and global-level protection layers. Commissioning tests, integration verification, and long-term operational validation were performed to assess system performance and reliability.</p> Results: <p>The system continuously supervises approximately 1100 parameters. HV operations and interlock responses are completed within 1&#xa0;s. Over more than one year of routine operation, interlock performance was evaluated using statistics from recorded detector events. No missed actuation was observed in the recorded events, and the automated HV protection and recovery logic successfully handled routine trip events, reducing operator workload and improving data-taking efficiency.</p> Conclusions: <p>The validated control logic and scalable architecture satisfy the operational requirements of the CGEM detector. The framework is also reusable for detector control systems in large-scale high-energy physics experiments.</p>

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A distributed control system for the BESIII CGEM detector

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Si Ma,
  • Jian Min

摘要

Purpose:

This paper presents a distributed monitoring and control system for the Cylindrical Gas Electron Multiplier (CGEM) inner tracker at the Beijing Spectrometer III (BESIII). Built on a LabVIEW-based framework, the system provides real-time data acquisition, data archiving, alarm handling, and operator interfaces. A state-machine-based high-voltage (HV) control mechanism enforces deterministic power-up sequences tailored to detector requirements. A multi-level safety interlock integrates status information from detector subsystems and BESIII global safety signals to trigger graded protection actions, including alarms, controlled HV ramp-down, and emergency shutdown. The design emphasizes reliability, scalability, and maintainability.

Methods:

The HV control is implemented using a finite-state machine with decoupled core logic and configurable operational sequences. The interlock architecture consists of unit-level, system-level, and global-level protection layers. Commissioning tests, integration verification, and long-term operational validation were performed to assess system performance and reliability.

Results:

The system continuously supervises approximately 1100 parameters. HV operations and interlock responses are completed within 1 s. Over more than one year of routine operation, interlock performance was evaluated using statistics from recorded detector events. No missed actuation was observed in the recorded events, and the automated HV protection and recovery logic successfully handled routine trip events, reducing operator workload and improving data-taking efficiency.

Conclusions:

The validated control logic and scalable architecture satisfy the operational requirements of the CGEM detector. The framework is also reusable for detector control systems in large-scale high-energy physics experiments.