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国家同步辐射实验室储存环超高真空系统自建成至今已稳定运行了 10年。储存环正常运行时 ,在储存能量 80 0 Me V时储存流强 2 0 0 m A的束流寿命已超过 6 0 0 min。 NSRL正在进行的二期工程 ,要求光源性能有进一步的提高和改善 ,机器达到长期、稳定、可靠运行。为了达到储存环能量 80 0 Me V时储存流强 30 0 m A时的束流寿命 6 0 0 min以上 ,有必要对现有的环真空系统进行改造。本文详细分析了 NSRL真空系统的现状和存在的问题 ,根据光源改造对真空系统的要求 ,提出了具体措施和改进方案
National Synchrotron Radiation Laboratory storage ring ultra-high vacuum system has been stable operation for 10 years. When the storage ring is in normal operation, the beam current of 200 m A stored at a flow rate of 80 0 MeV has exceeded 600 min. The ongoing second phase of NSRL requires that the performance of the light source be further improved and improved, and that the machine achieve long-term, stable and reliable operation. It is necessary to retrofit the existing ring vacuum system in order to reach a beam life of 600 m at a flow rate of 30 0 m A at a storage ring energy of 80 0 MeV. In this paper, the current situation and existing problems of NSRL vacuum system are analyzed in detail. According to the requirements of vacuum system for light source retrofitting, concrete measures and improvement measures are put forward