We present a characterization of a small (9-liter) and mobile 0.1% ${}^6$Li-doped pulse-shape-sensitive plastic scintillator antineutrino detector called SANDD (Segmented AntiNeutrino Directional Detector), constructed for the purpose of near-field reactor monitoring with sensitivity to antineutrino direction. SANDD comprises three different types of module. A detailed Monte Carlo simulation code was developed to match and validate the performance of each of the three modules. The combined model was then used to produce a prediction of the performance of the entire detector. Analysis cuts were established to isolate antineutrino inverse beta decay events while rejecting large fraction of backgrounds. The neutron and positron detection efficiencies are estimated to be 34.8% and 80.2%, respectively, while the coincidence detection efficiency is estimated to be 71.7%, resulting in inverse beta decay detection efficiency of 20.0% $\pm$ 0.2%(stat.) $\pm$ 2.1%(syst.). The predicted directional sensitivity of SANDD produces an uncertainty of 20${}^{\circ }$ in the azimuthal direction per 100 detected antineutrino events.

我们提出了一种小型（9升）和移动0.1％的特征 ${}^6$掺锂脉冲形敏感塑料闪烁体抗中微子一种称为SANDD（分段反中微子方向检测器）的探测器，构造用于对反中微子方向敏感的近场反应堆监测。SANDD包含三种不同类型的模块。开发了详细的蒙特卡洛模拟代码以匹配和验证三个模块中每个模块的性能。然后使用组合的模型对整个检测器的性能进行预测。建立了分析切点以分离抗中微子反β衰变事件，同时拒绝大部分背景。中子和正电子的检测效率分别估计为34.8％和80.2％，而巧合的检测效率估计为71.7％，导致反向β衰变检测效率为20.0％ $\pm$ 0.2％（统计） $\pm$ 2.1％（系统）预测的SANDD方向灵敏度会产生20的不确定度${}^{\circ }$ 每100个检测到的中微子事件在方位角方向上的位置。