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自由电子激光(Free Electron Laser,FEL)是一种以相对论高品质电子束作为工作介质,在周期磁场中以受激发射方式放大电磁辐射的新型激光源。束流稳定性的好坏是影响FEL性能的关键指标。波荡器段关键元件运行过程中的位置稳定性是影响束流位置稳定性的关键因素之一,其中上海软X射线自由电子激光(Soft X-ray FEL,SXFEL)和大连极紫外相干光源(Dalian Coherent Light Source,DCLS)科学研究装置中波荡器段间四极铁的位置稳定性要求较高。波荡器段间四极铁支撑平台为四极铁等关键元件提供支撑、定位及位置调节,从而间接地要求其具有高的稳定性。本文通过对一种平台的支撑方式进行模态和地基随机振动响应的有限元分析和测试,得到平台的结构动态特性,并进行稳定性分析,为段间平台的工程设计提供理论依据。
Free Electron Laser (FEL) is a new kind of laser source that uses relativistic high quality electron beam as working medium to amplify electromagnetic radiation by stimulated emission in periodic magnetic field. The stability of the beam is a key indicator of FEL performance. The position stability of the key elements in the undulator section is one of the key factors that influence the beam position stability. Among them, Soft X-ray FEL (SXFEL) and Dalian EUV coherent source (Dalian Coherent Light Source, DCLS) The positional stability of the quadrupole between the undulator sections in a scientific research installation is demanding. The four-pole support platform between the undulator sections provides support, positioning and position adjustment for key components such as quadrupoles, thereby indirectly requiring high stability. In this paper, the dynamic characteristics of the structure of the platform are obtained through the finite element analysis and testing of modal and foundation random vibration response of a platform support method, and the stability analysis is carried out to provide a theoretical basis for the engineering design of the platform between sections.