4B9B束线低能分支的性能改进

分析了北京同步辐射实验室4B9B原束线低能分支的构造及弊病,在不影响束线高能分支性能及总体机械结构的基础上提出了改进方案.详细介绍了该设计方案和光束线调试工作及出光后束线的性能测试工作,该测试结果完全符合束线的设计.该束线在同步辐射专用光实验中充分发挥了改进后的优势,取得了令人满意的结果

Performance Improvement of the Low Energy Branch of 4B9B Beamline in BSRF

B9B is a soft X-ray beamline in Beijing Synchrotron Radiation Laboratory, the photon energy range is 10-1000eV, photon energy of the low energy branch is from 10-60eV, mainly for angle resolved photoemission spectrum. Within years operation, some experiments were limited by the poor coumt-rate. This article analyzed the shortcomings on the design of the low energy branch, introduced a new scheme of beamline upgrade which need to change two focusing mirrors, meanwhile the mirror parameters was calculated and tracing results of the new beamline was presented. During SR beam time, performance of the beamline was tested after the improvement work, which shows a much more smaller focused image on sample position, and meanwhile the count-rate of experiments with upgraded are increased by more than one order. The beamline is put into use after the upgrade.