Key Technology Research And Performance Testing Of Horizontal Deflection Bender Used In Synchrotron Radiation Beamline

Synchrotron Radiation Facility is one kind of large scientific platforms thathundreds of people can do science and technology experimentations simultaneously. Itmainly composes of a light source, beam lines and experimental stations. Accordingto the requirements of experimental stations, beamline deflects, collimates, spectral,and focuses the synchrotron radiation light. Finally, it transmits the synchrotronradiation light to the experimental stations.For the third generation synchrotron radiation, the grazing angle is so small thatit needs longer mirror. Generally, the length of the mirror is up to1meter. It’s hard forus to use the traditional grinding method to process this kind of mirror with highprecision surface shape. Compared with the grinding mirror, the bending mirror hasmore advantages, for example, the bending radius can be adjusted, higher precisionsurface shape and so on. Currently, more and more large mirrors using the bendingtechniques are used on synchrotron radiation facility. The third synchrotron radiationfacility is equipped with lots of insertion devices, which mainly is dominated byUndulator. Usually, the bending mirrors used in synchrotron radiation facility areplaced horizontally with the reflect face up or down and the beam deflects vertically.But for the undulator sources, horizontal deflection bender has more advantages. Onthe other hand, horizontal deflection mirrors can be used in K-B focusing system. Thethird generation synchrotron radiation proposes higher requirements on thecollimating and focusing mirrors. So it is a practical and useful subject to study thekey technology of horizontal deflection bender and doing the performance testing,which not only can improve the bender’s performances, but also can improve the flux and energy resolution of the beamline.In this paper, based on the horizontal deflection bender demanded in theconstruction of SSRF, we researched the key technology of horizontal deflectionbender including the bending theory, compensating mechanism and the thermalreleasing technology. After this, we did some corresponding performance testing. Themain research contents and conclusions can be listed as follows:1) The horizontal deflection bender has more complex stress condition thanvertical deflection bender. The performance of the mirror is very sensitive to the stressrelative to the small slope errors and location errors. Based on the research of bendingtheory, the bending mode and pressure points are determined according to therequirements of the horizontal deflection bender. A point-grove-plane adjustmentsystem are used to realize the adjusting the spatial location of the horizontal deflectionbender. Then, a scheme of gravity compensation aiming at the gravity of mirror-selfand bender are proposed. Finally, the design was carried out.2) During the process of bending, the bending mirror undertakes the gravity ofmirror-self, counterbalancing force and bending moment, in addition, the bender-self,contact friction parts and local deform have influences on the bending, which result inthat the analysis results have errors with the practical results. In order to improve theaccuracy the analysis, the finite element model including the drive mechanism, theclamping mechanism and the mirror is constructed. Nonlinear contact analysismethods are applied to study the process of the bending, and the results are muchcloser to the actual situation.3) The third synchrotron radiation has high brightness, which impose highradiation power and power density on equipments used in beamline. How to protectthese optical elements from damage caused by heat and work well is one of the mainkey technologies that need to solve. Based on heat-release method, thermal-structuralcoupling analysis which considers thermal conduction, thermal radiation and thermalconvection together is carried out. The reasonable cooling method is adopted toreduce the heating loads and the time to reach thermal equilibrium, not only canimprove the experiments efficiency, but also can obtain better results.4) The installing and testing of the horizontal deflection bender is very important.Because the accuracy requirements of the bending mirror is very high and the mirroris so big, it is difficult to test. We used LTP-1200to test the radius and slope errors ofthe bending mirror during the process of bending. And an off-line performance testing scheme for horizontal deflection bender is designed to analyze the motion precision ofthe bender.The thesis mainly did the key technology research and performance testing of thehorizontal deflection bender. During the whole process of the study, we realized thedesign of horizontal deflection bender and did a specific study and research on theinfluence of gravity, bender-self, heating loads and so on. Then finite elementsoftware is used to simulate the bending and thermodynamic processes of the system.These results have very important significance and provide relevant theoreticalreference for the further engineering design of beamline.