A new electromagnetic calorimeter consisting of 140 lead tungstate (PbWO${}_4$) scintillating crystals was constructed for the PrimEx-$\eta$ experiment at Jefferson lab. The calorimeter was integrated into the data acquisition and trigger systems of the GlueX detector and used in the experiment to reconstruct Compton scattering events. The experiment started collecting data in the spring of 2019 and acquired about 30% of the required statistics. The calorimeter is a prototype for two PbWO${}_4$-based detectors: the Neutral Particle Spectrometer (NPS) and the lead tungstate insert of the Forward CALorimeter (FCAL) of the GlueX detector. The article presents the design and performance of the Compton calorimeter and gives a brief overview of the FCAL and NPS projects.

一种由 140 钨酸铅 (PbWO) 组成的新型电磁量热仪${}_4$) 闪烁晶体是为 PrimEx-$\eta$杰斐逊实验室的实验。热量计被集成到 GlueX 检测器的数据采集和触发系统中，并在实验中用于重建康普顿散射事件。该实验于 2019 年春季开始收集数据，并获得了所需统计数据的 30% 左右。热量计是两个 PbWO 的原型${}_4$基于探测器：中性粒子光谱仪 (NPS) 和 GlueX 探测器的正向热量计 (FCAL) 的钨酸铅插件。本文介绍了康普顿热量计的设计和性能，并简要概述了 FCAL 和 NPS 项目。