国家同步辐射实验室原子分子物理光束线气体滤波器的研制、安装和调试

Development,installation and adjustment of gas filter system of atomic and molecular physics beamline at national synchrotron radiation laboratory

为有效消除波荡器产生的高次谐波的影响,并维持光束线及储存环超高真空环境,根据原子分子物理光束线实际情况,采用二级差分抽气系统及大抽速的差分泵设计了气体滤波器系统。调试结果表明,在滤波气氩气压强PAr<1.333×103Pa时,光束线真空度维持在<4.933×10-7Pa,高次谐波滤波率>99.975%,满足了实验要求。

A differentially pumped rare gas absorption cell has been developed to suppress high order harmonic radiation on the atomic and molecule physics beamline at National Synchrotron Radiation Laboratory. The gas filter system contained a gas absorption cell and two differential pumping systems considering the present status of atomic and molecule physics beamline. The adjustment results indicated that the pressure of Ar in the gas cell should be lower than 1.333×10^3 Pa while preserving the beamline vacuum to 〈4.933×10^-7 Pa. When the pressure of Ar in the gas absorption cell was set to 1.241×10^3 Pa, the filter factor of gas filter system was better than 99.975%. Generally speaking, the adjustment results of the gas filter system were in agreement with the design parameters and could meet the experimental requirement very well.