Measurement of space charge effects in the MicroBooNE LArTPC using cosmic muons
Measurement of space charge effects in the MicroBooNE LArTPC using cosmic muons
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DOI：
10.1088/1748-0221/15/12/p12037
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发表时间：
2020-12-01
影响因子：
1.3
通讯作者：
Zhang, C.
中科院分区：
文献类型：
--
作者：
Abratenko, P.;Alrashed, M.;Zhang, C.
大型液态Ar时间投影室(LArTPC)，特别是那些工作在地表附近的，容易受到空间电荷效应的影响。在LArTPC的背景下，空间电荷效应是主要由于宇宙射线的电离而在探测器中积聚缓慢移动的正离子，导致探测器内部电场扭曲。这种效应导致LArTPC探测器中信号电离电子重建位置的位移(“空间失真”)，以及在整个TPC体积中电离所经历的电子-离子复合的量的变化。我们提出了一些技术，可以用来测量和校正大型LArTPC中的空间电荷效应，方法是利用宇宙介子，包括使用轨道对来明确地确定三维空间扭曲。使用蒙特卡罗模拟和MicroBooNE数据研究了这些校准技术的性能，利用UV激光系统作为估计与校准方法相关的系统偏差的手段。
Large liquid argon time projection chambers (LArTPCs), especially those operating near the surface, are susceptible to space charge effects. In the context of LArTPCs, the space charge effect is the build-up of slow-moving positive ions in the detector primarily due to ionization from cosmic rays, leading to a distortion of the electric field within the detector. This effect leads to a displacement in the reconstructed position of signal ionization electrons in LArTPC detectors ("spatial distortions"), as well as to variations in the amount of electron-ion recombination experienced by ionization throughout the volume of the TPC. We present techniques that can be used to measure and correct for space charge effects in large LArTPCs by making use of cosmic muons, including the use of track pairs to unambiguously pin down spatial distortions in three dimensions. The performance of these calibration techniques are studied using both Monte Carlo simulation and MicroBooNE data, utilizing a UV laser system as a means to estimate the systematic bias associated with the calibration methodology.