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Purpose <p>This paper presents the design and development of a comprehensive Personal Protection System (PPS) for the Compact Laser Plasma Accelerator for Proton Radiotherapy (CLAPA-II) at Peking University.</p> Methods <p>High-gradient laser accelerators operate based on the special mechanism of femtosecond pulsed laser–plasma interaction, featuring frequent mode switching and complex operating conditions. Meanwhile, the generated pulsed proton beams are characterized by short pulse durations and high dose rates, posing significant challenges for radiation protection and personnel safety. To address these issues, the proposed PPS develops dedicated interlock mechanisms tailored for laser accelerators and differentiated safety solutions for both laser areas and laser–plasma interaction regions. The core interlock logic and safety actions are executed by redundant programmable logic controllers (PLCs), ensuring fail-safe operation and high reliability. Through integration with the Experimental Physics and Industrial Control System (EPICS) framework, the PPS achieves seamless coordination with multiple subsystems across the accelerator facility, enabling distributed monitoring and data archiving. Additionally, the system incorporates deep learning techniques for anti-tailgating detection, enhancing safety monitoring capabilities.</p> Results <p>The intelligent and reliable PPS has been operating stably for over one year, providing effective protection for experimental personnel against radiation hazards at laser-driven accelerator facilities.</p> Conclusion <p>The proposed PPS demonstrates high reliability, intelligent monitoring capability, and strong adaptability for radiation safety protection in advanced laser-driven accelerator facilities.</p>

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Design and development of the personnel protection system for a petawatt laser accelerator

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Mengxuan Zang,
  • Qiang Wang,
  • Ensuo Guo,
  • Qiangyou He,
  • Jie Zhao,
  • Yuyang Zhang,
  • Liang Hu,
  • Mingyu Zhao,
  • Shuo Jin,
  • Mengfan Cao,
  • Xueqing Yan,
  • Chen Lin

摘要

Purpose

This paper presents the design and development of a comprehensive Personal Protection System (PPS) for the Compact Laser Plasma Accelerator for Proton Radiotherapy (CLAPA-II) at Peking University.

Methods

High-gradient laser accelerators operate based on the special mechanism of femtosecond pulsed laser–plasma interaction, featuring frequent mode switching and complex operating conditions. Meanwhile, the generated pulsed proton beams are characterized by short pulse durations and high dose rates, posing significant challenges for radiation protection and personnel safety. To address these issues, the proposed PPS develops dedicated interlock mechanisms tailored for laser accelerators and differentiated safety solutions for both laser areas and laser–plasma interaction regions. The core interlock logic and safety actions are executed by redundant programmable logic controllers (PLCs), ensuring fail-safe operation and high reliability. Through integration with the Experimental Physics and Industrial Control System (EPICS) framework, the PPS achieves seamless coordination with multiple subsystems across the accelerator facility, enabling distributed monitoring and data archiving. Additionally, the system incorporates deep learning techniques for anti-tailgating detection, enhancing safety monitoring capabilities.

Results

The intelligent and reliable PPS has been operating stably for over one year, providing effective protection for experimental personnel against radiation hazards at laser-driven accelerator facilities.

Conclusion

The proposed PPS demonstrates high reliability, intelligent monitoring capability, and strong adaptability for radiation safety protection in advanced laser-driven accelerator facilities.