用于GlueX-III粲夸克偶素计划的跃迁辐射探测器升级
Transition Radiation Detector Upgrade for the GlueX-III Charmonium Program
AI总结：
该研究为GlueX-III实验设计并测试了大型三层GEM跃迁辐射探测器原型，验证了其电子鉴别与时间性能，可有效抑制背景，为未来EIC探测器升级提供参考。
AI中文摘要：
位于杰斐逊实验室的GlueX-III实验计划于2027-2029年运行，将增强实验室在阈值附近探索粲夸克偶素产生以及非微扰区域QCD相关方面的能力。GlueX-III的一项核心升级是大型三层GEM跃迁辐射探测器（TRD），该探测器针对固定靶光产生过程中强子丰富环境下的电子鉴别和π介子抑制进行了优化。本文档描述了此次升级的动机及相关工作，包括在2025年运行期间于现有GlueX-II实验接收度内测试的720x528mm$^{2}$三层GEM-TRD原型的设计、建造和性能。结果验证了原型的集成、时间性能以及电子鉴别能力。文中讨论了其在GlueX-III环境中的预期影响，并展示了在$J/\psi$候选样本中的背景抑制效果。在杰斐逊实验室高背景环境下开发和采用现代TRD技术，可为未来EIC升级路径的探测器设计选择提供参考。
英文摘要：
The GlueX-III experiment at Jefferson Lab, planned to run in 2027-2029, will enhance the laboratory's capability to explore charmonium production near threshold and related aspects of QCD in the non-perturbative regime. A central upgrade for GlueX-III is a large-scale triple-GEM Transition Radiation Detector (TRD) optimized for electron identification and pion suppression in the hadron-rich environment of fixed-target photoproduction. This document describes the motivation for and efforts related to such an upgrade, including the design, construction, and performance of a 720x528mm$^{2}$ triple-GEM-TRD prototype that was tested in the existing GlueX-II experimental acceptance during the 2025 run. Results validate the prototype's integration, timing performance, and electron identification capability. Its projected impact in the GlueX-III setting is discussed, with background reduction in a $J/ψ$ candidate sample demonstrated. The development and use of a modern TRD technology in a high-background environment at Jefferson Lab may inform detector design choices as a future upgrade path for the EIC.
