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您的检索式：作者名="Qing Keyun"
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| 1 | Control system for cryogenic permanent magnet undulator(CPMU)of high energy photon source(HEPS)显示文摘Background High energy photon source(HEPS)is the fourth-generation light source,which uses a large number of highperformance insertion devices to generate synchrotron radiation.The control system is an important part of the insertion device(ID).Purpose Cryogenic permanent magnet undulator(CPMU)is one kind of IDs that works in liquid nitrogen temperature and ultra-high vacuum environment,and its control system is more difficult and complex than in-air ID.The design of the control system for CPMU will be introduced in detail.Method The sub-systems include high-precision magnetic gap control,safety protection,measurement and compensation of magnetic gap at cryogenic temperature and cryogenic temperature monitoring.Mature,reliable,stable technical schemes are designed to meet the technical specifications of sub-systems.Results The experiment results show that the magnetic gap motion accuracy can be controlled within 0.2–0.3μm under the step size of 1μm.The safety protection system has been tested in turn,and the predetermined protection can be achieved.The average value of magnetic gap cold contraction is 1.512 mm measured by optical micrometer,and the compensation is realized by software.The average temperature of the main magnet structure measured by the temperature sensors is 81.0 K,and the temperature gradient is 0.7 K/m.The temperature monitoring is reliable and stable.Conclusion The CPMU control system which is based on EPICS has been successfully applied to the CPMU prototype,and the test results have met the design specifications. | Shutao Zhao Jianshe Cao Huihua Lu Xiaoyu Li Shuchen Sun Yajun Sun Xiangzhen Zhang Lei Zhang Yuhui Li Zhiqiang Li Wan Chen Lingling Gong Qing Guo Keyun Gong Yongsheng Huang Yanwei Yang Yufeng Yang | 2021 | Radiation Detection Technology and Methods2021，5，1： | 2 |
| 2 | L-valued propositional logic Lvpl 显示文摘 | Xu Yang Qing Keyun | 1999 | Information Sciences1999，114，： | 1 |
| 3 | Mechanical design of a cryogenic Delta-Knot undulator for high energy photon source显示文摘Introduction A novel type of pure permanent cryogenic Delta–Knot Undulator was developed at IHEP to supply a high flux of full adjustable polarization synchrotron radiation with low on-axis power density.This prototype was an active attempt and early exploration for future APPLE–Knot undulator,which will be used at high energy photon source(HEPS).Materials and methods There are several challenges to develop a cryogenic delta undulator,such as the complicated structure,the influence of large magnetic force,and the magnetic measurement difficulty due to the very small gap.In this paper,the mechanical design for overcoming these difficulties will be presented in detail.Conclusion A special hall measuring system is developed,and the preliminary results agree with the theoretical results.This undulator prototype will provide valuable experience for angle magnetization technology,intricate magnetic attraction structure design,and magnetic field measurement under closed small space. | Shuchen Sun Huihua Lu Xiaoyu Li Xiangzhen Zhang Yanwei Yang Yajun Sun Lei Zhang Yuhui Li Zhiqiang Li Wan Chen Lingling Gong Shutao Zhao Qing Guo Keyun Gong Yongsheng Huang Yufeng Yang | 2021 | Radiation Detection Technology and Methods2021，5，1： | 1 |
| 4 | On semantics of L-valued first order logic Lvfl 显示文摘 | Xu Yang Qing Keyun | 2000 | Int J General systems2000，29，1： | 1 |
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