Application of movable collimators to the BEPCⅡ

LUO Tao; JIN Da-Peng; XING Jun; HUANG Nan; DONG Ming-Yi; LI Wei-Guo; LI Hai-Bo; WU Ying-Zhi; ZHANG Qing-Jiang; LIU Guan-Chuan

doi:10.1088/1674-1137/34/11/015

Chinese Physics C> 2010, Vol. 34> Issue(11) : 1742-1748 DOI: 10.1088/1674-1137/34/11/015

Application of movable collimators to the BEPCⅡ

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Abstract：
BEPCⅡ is a double ring e⁺e^－ collider with high beam currents and luminosity, so the high beam-related 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 e^－ rings. 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 effectiveness 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.

References

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LUO Tao, JIN Da-Peng, XING Jun, HUANG Nan, DONG Ming-Yi, LI Wei-Guo, LI Hai-Bo, WU Ying-Zhi, ZHANG Qing-Jiang and LIU Guan-Chuan. Application of movable collimators to the BEPCⅡ[J]. Chinese Physics C, 2010, 34(11): 1742-1748. doi: 10.1088/1674-1137/34/11/015

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Received: 2009-12-10
Revised: 2010-04-30

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沈阳化工大学材料科学与工程学院沈阳 110142

Application of movable collimators to the BEPCⅡ

Corresponding author: LUO Tao,

Received Date: 2009-12-10
Accepted Date: 2010-04-30
Available Online: 2010-11-05

Abstract:

BEPCⅡ is a double ring e⁺e^－ collider with high beam currents and luminosity, so the high beam-related 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 e^－ rings. 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 effectiveness 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.