分类: 核科学技术 >> 核科学与技术 分类: 核科学技术 >> 粒子加速器 提交时间: 2023-06-20
摘要: With the development of high-performance photon sources which have extremely low emittance,autotuning magnet girders have drawn more and more attention, especially for diffraction-limited storagerings and free-electron lasers. The biggest challenge is to simultaneously obtain high stability and highflexibility. In this paper, an autotuning magnet-girder prototype has been designed and developed.Topological optimization, multipoint supports, and locking systems have been applied for magnet-girderdesign to improve the stability. The modal analysis accords with the vibration test well. The naturalfrequency of the magnet-girder assembly is deduced as high as 45.6 Hz, which demonstrates good stability.Ball-cam movers have been chosen as adjustment mechanisms, and a closed-loop control scheme has beenused to pursue high accuracy. The kinematic resolution is better than 1 m, and the accuracy is better than1 m within the adjusting range of #1;5 mm. Besides, it can eliminate most of the calibration, which cansave much manpower and time. The tests demonstrate that the magnet girder can be used for beam-basedgirder alignment with high stability and high accuracy.
分类: 物理学 >> 凝聚态:结构、力学和热性能 提交时间: 2017-03-26
摘要: The technique details for measuring radiation dose are expounded. The results of radiation levels of gamma and neutron are presented and the corresponding radiation shielding is discussed based on the simplified estimation. In addition, the radiation level of photon as background for the future experiment is measured by NaI(Tl) detector.