Position reconstruction in LUX
Position reconstruction in LUX
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DOI：
10.1088/1748-0221/13/02/p02001
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发表时间：
2018-02-01
影响因子：
1.3
通讯作者：
Zhang, C.
中科院分区：
文献类型：
--
作者：
Akerib, D. S.;Alsum, S.;Zhang, C.
本文介绍了用于大型地下氙（LUX）实验全曝光量分析的（x，y）位置重建方法。该算法是基于一个统计测试，利用迭代的方法来恢复光电倍增管（PMT）的光响应直接从校准数据。光响应函数利用二维函数形式来说明在检测器的内壁上反射的光子。为了提高小脉冲的分辨率，采用光子计数技术来描述光电倍增管的响应。重建进行了评估与校准数据，包括83 mKr（释放的总能量为41.5 keV）和3 H（β（-）与Q = 18.6 keV）衰变，和氘-氘（D-D）中子束（2.45 MeV）。在检测器的基准体积内，对于分别仅200和4，000个检测到的电致发光光子的事件，重建已经实现了sigma = 0.82 cm和sigma = 0.17 cm的（x，y）位置不确定性。这样的信号与能量分别类似于0.25 keV和类似于10 keV的电子反冲相关联。具有从液体表面发射的单个电子（22个检测到的光子）的最小事件的重建位置具有2.13cm的水平（x，y）不确定性。
The (x, y) position reconstruction method used in the analysis of the complete exposure of the Large Underground Xenon (LUX) experiment is presented. The algorithm is based on a statistical test that makes use of an iterative method to recover the photomultiplier tube (PMT) light response directly from the calibration data. The light response functions make use of a two dimensional functional form to account for the photons reflected on the inner walls of the detector. To increase the resolution for small pulses, a photon counting technique was employed to describe the response of the PMTs. The reconstruction was assessed with calibration data including 83mKr (releasing a total energy of 41.5 keV) and 3H (beta(-) with Q = 18.6 keV) decays, and a deuterium-deuterium (D-D) neutron beam (2.45 MeV). Within the detector's fiducial volume, the reconstruction has achieved an (x, y) position uncertainty of sigma = 0.82 cm and sigma = 0.17 cm for events of only 200 and 4,000 detected electroluminescence photons respectively. Such signals are associated with electron recoils of energies similar to 0.25 keV and similar to 10 keV, respectively. The reconstructed position of the smallest events with a single electron emitted from the liquid surface (22 detected photons) has a horizontal (x, y) uncertainty of 2.13 cm.