A method to determine the electric field of liquid argon time projection chambers using a UV laser system and its application in MicroBooNE
A method to determine the electric field of liquid argon time projection chambers using a UV laser system and its application in MicroBooNE
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DOI：
10.1088/1748-0221/15/07/p07010
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发表时间：
2019-04
影响因子：
1.3
通讯作者：
MicroBooNE collaboration C. Adams;M. Alrashed;Rui An;J. Anthony;J. Asaadi;A. Ashkenazi;S. Balasubramanian-S.-Bal
中科院分区：
文献类型：
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作者：
MicroBooNE collaboration C. Adams;M. Alrashed;Rui An;J. Anthony;J. Asaadi;A. Ashkenazi;S. Balasubramanian-S.-Bal
液态氩时间投影室（LArTPC）现在是一种标准的探测器技术，用于进行加速器中微子测量，由于其高材料密度，精确跟踪和量热能力。在这样的检测器中需要电场（E场）以使电离电子漂移到阳极，在阳极处电离电子被收集。TPC的E场通常近似为在阳极平面和阴极平面之间是均匀的。然而，由于机械变形、电极故障或宇宙射线产生的空间电荷积累等影响，可能会出现显著的失真。后一种效应与放置在地球表面附近、漂移距离大、漂移时间长的探测器特别相关。为了确定电场原位，紫外（UV）激光系统安装在费米国家加速器实验室的MicroBooNE实验。该系统的目的是提供E场的精确测量，并且使得能够校正由于E场不均匀性而引起的3D空间失真。在这里，我们描述的方法，推导出的空间失真，漂移速度和电场从紫外激光测量。
Liquid argon time projection chambers (LArTPCs) are now a standard detector technology for making accelerator neutrino measurements, due to their high material density, precise tracking, and calorimetric capabilities. An electric field (E-field) is required in such detectors to drift ionization electrons to the anode where they are collected. The E-field of a TPC is often approximated to be uniform between the anode and the cathode planes. However, significant distortions can appear from effects such as mechanical deformations, electrode failures, or the accumulation of space charge generated by cosmic rays. The latter effect is particularly relevant for detectors placed near the Earth's surface and with large drift distances and long drift time. To determine the E-field in situ, an ultraviolet (UV) laser system is installed in the MicroBooNE experiment at Fermi National Accelerator Laboratory. The purpose of this system is to provide precise measurements of the E-field, and to make it possible to correct for 3D spatial distortions due to E-field non-uniformities. Here we describe the methodology developed for deriving spatial distortions, the drift velocity and the E-field from UV-laser measurements.