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Purpose <p>The High Energy Photon Source (HEPS) is the fourth-generation synchrotron photon source with 6&#xa0;GeV electron energy. The magnet temperature protection system serves as the final line of defense for water-cooled magnets, &#xa0;so its long-term operational stability and reliability are&#xa0;critical. The HEPS magnet temperature protection system safeguards 1769 water-cooled magnets distributed across the storage ring tunnel, booster tunnel, and high-energy transmission line tunnel. These magnets are powered by 1050 corresponding magnet power supplies located in nine power supply halls. &#xa0;Given the large quantity and wide distribution of magnets and power supplies, this paper details the design of the magnet temperature protection system.</p> Methods <p>This system adopts a S7-1500 programmable logic controller (PLC) as its control core. Temperature sensors transmit signals to the PLC control unit, which determines whether the magnet has overheated. It then sends signals to the magnet power supply to trigger the interlock response and cut off the main circuit, thereby achieving protection for the magnet. Concurrently, an HMI host computer is designed to visualize the magnet and power supply status and enable read–write operations on intermediate registers.</p> Results <p>The system detected magnet failures caused by water circuit malfunctions, damaged temperature probes, and short circuits between temperature probes and loads, and promptly issued commands to cut off power supply output, effectively protecting the magnets.</p> Conclusions <p>The operational results demonstrate that the system can accurately and reliably implement magnet temperature protection, with a well-designed solution that ensures long-term stable operation.</p>

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HEPS magnet temperature protection system

  • 期刊论文

  • 发表日期：

    2026年4月4日

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  • Yuting Liu,
  • Yao Gao,
  • Chao Han,
  • Suying Chen,
  • Fengli Long,
  • Pengfei Wei

摘要

Purpose

The High Energy Photon Source (HEPS) is the fourth-generation synchrotron photon source with 6 GeV electron energy. The magnet temperature protection system serves as the final line of defense for water-cooled magnets,  so its long-term operational stability and reliability are critical. The HEPS magnet temperature protection system safeguards 1769 water-cooled magnets distributed across the storage ring tunnel, booster tunnel, and high-energy transmission line tunnel. These magnets are powered by 1050 corresponding magnet power supplies located in nine power supply halls.  Given the large quantity and wide distribution of magnets and power supplies, this paper details the design of the magnet temperature protection system.

Methods

This system adopts a S7-1500 programmable logic controller (PLC) as its control core. Temperature sensors transmit signals to the PLC control unit, which determines whether the magnet has overheated. It then sends signals to the magnet power supply to trigger the interlock response and cut off the main circuit, thereby achieving protection for the magnet. Concurrently, an HMI host computer is designed to visualize the magnet and power supply status and enable read–write operations on intermediate registers.

Results

The system detected magnet failures caused by water circuit malfunctions, damaged temperature probes, and short circuits between temperature probes and loads, and promptly issued commands to cut off power supply output, effectively protecting the magnets.

Conclusions

The operational results demonstrate that the system can accurately and reliably implement magnet temperature protection, with a well-designed solution that ensures long-term stable operation.