The MicroBooNE Experiment and the Impact of Space Charge Effects
The MicroBooNE Experiment and the Impact of Space Charge Effects
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MicroBooNE 实验和空间电荷效应的影响
DOI：
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发表时间：
2015
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通讯作者：
M. Mooney
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作者：
M. Mooney
MicroBooNE是一项旨在探测中微子物理现象和开发LArTPC（液体氩时间投影室）探测器技术的实验。MicroBooNE实验于今年开始采集数据，是美国第一个大型LArTPC探测器。该实验是美国SBL（短基线）和LBL（长基线）计划设想的探测器（地面和地下）路径的开始。为了解释来自表面实验的数据，必须模拟和校准空间电荷效应的影响。空间电荷效应是由于例如来自宇宙射线的电离而在检测器中缓慢移动的正离子的积累，导致检测器内的电场失真。这种效应导致LArTPC探测器中信号电离电子的重建位置发生位移。在MicroBooNE实验中使用的LArTPC预计会受到空间电荷效应的适度影响，在TPC内的某些位置，电场幅度变化约为5%（漂移场为500 V/cm）。我们讨论了模拟的空间电荷效应MicroBooNE以及校准技术，利用紫外激光系统和宇宙μ子事件。空间电荷效应的成功校准对于MicroBooNE物理计划的成功以及未来实验的LArTPC技术的发展都至关重要。
MicroBooNE is an experiment designed to both probe neutrino physics phenomena and develop the LArTPC (Liquid Argon Time Projection Chamber) detector technology. The MicroBooNE experiment, which began taking data this year, is the first large LArTPC detector in the U.S. This experiment is the beginning of a path of detectors (both on the surface and underground) envisioned for the U.S. SBL (Short-BaseLine) and LBL (Long-BaseLine) programs. In order to interpret the data from the experiments on the surface, the impact of space charge effects must be simulated and calibrated. The space charge effect is the build-up of slow-moving positive ions in a detector due to, for instance, 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. The LArTPC utilized in the MicroBooNE experiment is expected to be modestly impacted from the space charge effect, with the electric field magnitude changing by roughly 5\% (at a drift field of 500 V/cm) in some locations within the TPC. We discuss the simulation of the space charge effect at MicroBooNE as well as calibration techniques that make use of a UV laser system and cosmic muon events. A successful calibration of the space charge effect is imperative both to the success of the MicroBooNE physics program as well as to the development of LArTPC technology for future experiments.