The alignment and measurement of the magnetic field for muon counter at BESIII

分类： 物理学 >> 核物理学 提交时间： 2016-09-01

Q. Gao J. Z. Zhang C. H. Li

摘要： Based on cosmic ray events taken without magnet filed during summer shutdown, we compare the coordinates of hits in muon counter with the expected interaction point of extrapolated tracks from the inner tracking system. By minimizing the difference, we align the muon counter with the inner tracking system. The muon counter is operating in magnetic return yoke and the magnetic field has never been measured before. The strength of the magnetic field of the muon counter is measured for the first time with μ+ and μ− separately. After the alignment and magnetic field measurement, the offsets of hit-position for μ+ and μ− are diminished. The alignment and magnetic field measurement are adopted in the latest BESIII offline software system. This makes physics analysis involving muon counter information more reliable.

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