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BEPC对撞区真空系统是储存环真空系统中最重要的部分之一 ,对撞区真空系统的性能直接影响着用于高能物理实验的谱仪探测器的本底 ,因此提高对撞区的真空度非常重要。本文提出了在靠近对撞点的附近安装 NEG泵用于提高对撞区真空度的方案 ,并且用经典的数学计算方法和蒙特卡洛模拟计算方法预测了安装 NEG泵的效果 ,同时在实验中证明了通过 NEG泵改善对撞区真空度的可行性。通过对 BEPC对撞区真空系统的改进 ,使 BEPC对撞区静态压强由原来的 8× 10 - 8Pa下降到 2 .7× 10 - 8Pa。
The BEPC collision zone vacuum system is one of the most important parts of the storage ring vacuum system. The performance of the vacuum system in the collision zone directly affects the background of the spectrometer detector used in high-energy physics experiments. Therefore, the vacuum of the collision zone Very important. In this paper, a scheme of installing NEG pump near the collision point to improve the vacuum degree of the collision zone is proposed, and the effect of installing NEG pump is predicted by the classical mathematical calculation method and Monte Carlo simulation method. At the same time, it is proved experimentally The feasibility of improving the vacuum level of the collision zone with NEG pump. By improving the vacuum system of the BEPC colliding zone, the static pressure in the BEPC colliding zone was reduced from 8 × 10 - 8 Pa to 2 × 10 - 8 Pa.