Application of movable collimators to the BEPCⅡ  

作　　者：罗涛 金大鹏 邢军 黄楠 董明义 李卫国 李海波 吴英志 张清江 刘冠川 

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences [2]Graduate University of Chinese Academy of Sciences

出　　处：《Chinese Physics C》2010年第11期1742-1748,共7页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(10491300);National Science Fund for Distinguished Young Scholars(10225524);Major Programs of Chinese Academy of Sciences(KJ95T-03)

摘　　要：BEPCⅡ is a double ring e＋ecollider with high beam currents and luminosity,so the high beamrelated backgrounds may disturb the detector.In order to have a good quality of data taking,backgrounds should be kept at a level as low as possible.A series of collimators are designed and installed in both the e＋ and erings.Two of the collimators are horizontally movable,each for one ring,about 8 m upstream from the interaction point.Experiments have been done to identify the e-ectiveness of the movable collimators with different apertures and beam currents.The results show that the movable collimators are very effective and can reduce as much as about 50% of beam-related backgrounds.BEPCⅡ is a double ring e＋ecollider with high beam currents and luminosity,so the high beamrelated backgrounds may disturb the detector.In order to have a good quality of data taking,backgrounds should be kept at a level as low as possible.A series of collimators are designed and installed in both the e＋ and erings.Two of the collimators are horizontally movable,each for one ring,about 8 m upstream from the interaction point.Experiments have been done to identify the e-ectiveness of the movable collimators with different apertures and beam currents.The results show that the movable collimators are very effective and can reduce as much as about 50% of beam-related backgrounds.

关 键 词：movable collimators beam-related backgrounds dark current 

分 类 号：O572.214[理学—粒子物理与原子核物理] TH774[理学—物理]