Aging effect in the BESIII drift chamber

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Ming-Yi Dong, Qing-Lei Xiu, Ling-Hui Wu, Zhi Wu, Zhong-Hua Qin, Pin Shen, Fen-Fen An, Xu-Dong Ju, Yi Liu, Kai Zhu, Qun Ou-Yang and Yuan-Bo Chen. Aging effect in the BESIII drift chamber[J]. Chinese Physics C, 2016, 40(1): 016001. doi: 10.1088/1674-1137/40/1/016001
Ming-Yi Dong, Qing-Lei Xiu, Ling-Hui Wu, Zhi Wu, Zhong-Hua Qin, Pin Shen, Fen-Fen An, Xu-Dong Ju, Yi Liu, Kai Zhu, Qun Ou-Yang and Yuan-Bo Chen. Aging effect in the BESIII drift chamber[J]. Chinese Physics C, 2016, 40(1): 016001.  doi: 10.1088/1674-1137/40/1/016001 shu
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Received: 2015-04-21
Revised: 2015-08-12
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    Supported by the CAS Center for Excellence in Particle Physics (CCEPP)

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Aging effect in the BESIII drift chamber

  • 1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 2. State Key Laboratory of Particle Detection and Electronics, Beijing 100049, China
  • 3.  Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 4. University of Chinese Academy of Sciences, Beijing 100049, China
Fund Project:  Supported by the CAS Center for Excellence in Particle Physics (CCEPP)

Abstract: As the main tracking detector of BESIII, the drift chamber provides accurate measurements of the position and the momentum of the charged particles produced in e+e- collisions at BEPCII. After six years of operation, the drift chamber is suffering from aging problems due to huge beam-related background. The gains of the cells in the first ten layers show an obvious decrease, reaching a maximum decrease of about 29% for the first layer cells. Two calculation methods for the gain change (Bhabha events and accumulated charges with 0.3% aging ratio for inner chamber cells) give almost the same results. For the Malter effect encountered by the inner drift chamber in January 2012, about 0.2% water vapor was added to the MDC gas mixture to solve this cathode aging problem. These results provide an important reference for MDC operating high voltage settings and the upgrade of the inner drift chamber.

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