A study of the calibration of wire positions for the BESⅢ drift chamber using physics data without magnetic field

WU Ling-Hui; WANG Yi-Fang; CHEN Yuan-Bo; LIU Jian-Bei; LIU Rong-Guang; MA Xiao-Yan

doi:10.1088/1674-1137/32/4/005

Chinese Physics C> 2008, Vol. 32> Issue(4) : 264-268 DOI: 10.1088/1674-1137/32/4/005

A study of the calibration of wire positions for the BESⅢ drift chamber using physics data without magnetic field

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Abstract：
A method to determine precisely three-dimensional wire positions in the BESⅢ drift chamber using physics events is introduced. In part the proposed technique takes advantage of the possibility that the magnetic field can be turned off, thereby providing a huge sample of straight tracks for which effects due to multiple scattering, energy loss and non-uniformity of the magnetic field are minimized during the calibration process. A toy Monte Carlo study is performed to demonstrate the viability of the method. As a result of the calibration process, the rms of the distribution of wire position deviation is reduced from 35μm to 10μm.

References

[1]

. BESⅢ Collaboration. BESIII Preliminary Design Report,20042. LIU J B et al. Nucl. Instrum. Methods A, 2006, 557: 4363. Hearty C. BaBar-TNDC-95-12, Oct.15, 19954. Sudou S et al. Nucl. Instrum. Methods A, 1996, 383: 3915. Va'vra J. Calculation of Two-Dimensional Electrostatic Field in a Drift Cell: SLAC Detector Techniques Lectures.19986. Kpke L, Wermes N. J/Ψ Decays. CERN-EP/88-937. LI Wei-Dong, LIU Huai-Min et al. The Offline Software for the BESⅢ Experiment. Proceeding of CHEP06, Mumbai,2006

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WU Ling-Hui, WANG Yi-Fang, CHEN Yuan-Bo, LIU Jian-Bei, LIU Rong-Guang and MA Xiao-Yan. A study of the calibration of wire positions for the BESⅢ drift chamber using physics data without magnetic field[J]. Chinese Physics C, 2008, 32(4): 264-268. doi: 10.1088/1674-1137/32/4/005

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Received: 2007-07-24
Revised: 2007-10-13

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沈阳化工大学材料科学与工程学院沈阳 110142

A study of the calibration of wire positions for the BESⅢ drift chamber using physics data without magnetic field

Corresponding author: WU Ling-Hui,

Received Date: 2007-07-24
Accepted Date: 2007-10-13
Available Online: 2008-04-05

Abstract:

A method to determine precisely three-dimensional wire positions in the BESⅢ drift chamber using physics events is introduced. In part the proposed technique takes advantage of the possibility that the magnetic field can be turned off, thereby providing a huge sample of straight tracks for which effects due to multiple scattering, energy loss and non-uniformity of the magnetic field are minimized during the calibration process. A toy Monte Carlo study is performed to demonstrate the viability of the method. As a result of the calibration process, the rms of the distribution of wire position deviation is reduced from 35μm to 10μm.