Application of movable collimators to the BEPC

• Published in: Chinese physics C Vol. 34; no. 11; pp. 1742 - 1748
• Main Author: 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
• Format: Journal Article
• Language: English
• Published: Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China 2010; Graduate University of Chinese Academy of Sciences,Beijing 100049,China%Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China
• Subjects: 准直器; 探测器; 数据质量; 正负电子对撞机; 灯电流; beam-related backgrounds; movable collimators; dark current
• ISSN: 1674-1137; 0254-3052

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.