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目前BEPC储存环真空系统已经运行了十五年,系统运行良好,当有束流存在时,储存环的平均动态压强低于2.6×10-7Pa,束流寿命大于10 h。尽管真空系统部件多,结构复杂,但由于真空泄漏造成停机的次数并不多,大多数的泄漏能在抽真空和系统检漏期间排除。为了提高北京正负电子对撞机的性能,BEPC储存环真空系统进行了一系列的改进,例如,重新改造铝真空盒用来引出同步辐射光束线,在正负电子对撞区安装NEG泵来提高真空度。特别是真空内的扭摆磁铁被安装到储存环真空系统,通过在永久磁块表面镀氮化钛和合理的排气技术,静态压强已经达到了2.6×10-8Pa。
At present, the BEPC storage ring vacuum system has been in operation for fifteen years and the system works well. When there is a beam current, the average dynamic pressure of the storage ring is lower than 2.6 × 10-7Pa and the beam life is longer than 10 h. Despite the large number of vacuum system components and complex structures, there is not much downtime due to vacuum leaks, and most of the leaks can be ruled out during vacuuming and system leak testing. In order to improve the performance of BIPC, a series of improvements have been made to the BEPC storage ring vacuum system. For example, the aluminum vacuum box is rebuilt to extract the synchrotron radiation beamline. A NEG pump is installed in the positive and negative electron impact zone Improve the degree of vacuum In particular, the torsion magnet in vacuum is mounted to the storage ring vacuum system. The static pressure has reached 2.6 × 10 -8 Pa by plating titanium nitride on the surface of the permanent magnet with a reasonable venting technique.