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一、引言为保证贮存环中的束流寿命长达十小时,贮存环中的气压必须低于2×10~(-9)托。但是,贮存环的弯转段及弯转段顺流处存在强烈的同步辐射,辐射光对真空室壁的光电解吸作用,产生了严重的气载。因环中束流能量为800MeV,流强为300mA,辐射引起的气载要比材料热出气产生的气载高1个以上的数量级。这么高的气载,如不及时抽走,就会严重影响束流寿命,使机器不能正常运行。另一方面,贮存环的细长真空管道流导小,集中式抽气泵组
I. INTRODUCTION To ensure that the beam life in a storage ring is as long as ten hours, the pressure in the storage ring must be less than 2 x 10-9 (-9) Torr. However, there is a strong synchrotron radiation at the bending section and the bending section of the storage ring. The photo-elec- tron desorption of the vacuum chamber wall by the radiation has a serious air-borne condition. Because the beam energy in the ring is 800 MeV and the flow strength is 300 mA, the air-induced radiation load is more than one order of magnitude higher than the air-load generated by the material hot air outflow. Such a high air-load, if not removed in time, will seriously affect the beam life, so that the machine can not be normal operation. On the other hand, the storage ring slender vacuum pipe flow guide small, centralized suction pump group