Research on protection system of resonant network in CSNS magnet power supplies
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ORIGINAL PAPER
Research on protection system of resonant network in CSNS magnet power supplies Xiao-Ling Guo1,2
· Wen-qing Zhang1,2 · Jun Li1,2 · Yuan Huang1,2 · Xin Qin1,2 · Yun-tao Liu1,2 · Zu-yue Hao1,2
Received: 25 February 2020 / Revised: 11 May 2020 / Accepted: 15 May 2020 © Institute of High Energy Physics, Chinese Academy of Sciences 2020
Abstract Purpose Chinese Spallation Neutron Source (CSNS) is one of the key projects of China, in which the main magnet power supplies adopt the structures of resonant networks (Wang et al. in Sci China Phys Mech Astron 54(Suppl 2):239–244, 2011). Since each network contains a lot of components, and the working state of all the components will affect the whole accelerator, it is necessary to monitor the operation of each part in the resonant network. Methods In this protections system, a supervision to 314 switch signals and 118 analog signals is realized using a chip of field programmable gate array (FPGA). The details about the hardware and software designs are introduced in this paper. Results This protection system has been used in CSNS project, and the result proves that the RCS has been well monitored by this system. Conclusions This system is a self-developed protection system according to the engineering needs of CSNS. It can realize the real-time monitoring and protection of the working state of resonance network by processing a large number of data using FPGA. Keywords CSNS · Resonant network · Protection system · Magnet power supply
Introduction Spallation neutron source (SNS) is an important device of research on material microstructural and dynamic process. Chinese Spallation Neutron Source is a high neutron flux source, which is one of key projects at Chinese twelfth fiveyear plans. It is one of the four spallation neutron sources in the world [1]. The main structure of CSNS is a rapid cycling synchrotron (RCS), in which the magnet power supply system adopts the structures of White circuits [1], which are resonant networks. In the RCS of CSNS, the resonant network consists of the dipole magnets (B-magnets), the quadrupole magnets (Qmagnets), the resonant reactors, the resonant capacitors, and several sets of magnet power supplies [2]. Since the working states of each section of the resonant networks will affect the operation of the entire accelerator, it is necessary to ensure the
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Xiao-Ling Guo [email protected]
1
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2
Dongguan Neutron Science Center, Dongguan 523803, China
reliability and validity of each resonant cell in the network. In order to monitor the working of the White circuits in the RCS, a protection system is designed to keep a watch on each part of the cells and realize fault diagnosis and troubleshooting.
Demands to the protection system There are six cells in the resonant network of the CSNS’s RCS ring, including a dipole magnets resonant cell and five quadrupole magnet resonant cells. Each resonance cell uses a series White circuit. Figure 1 shows
