基于THGEM的TPC读出研究

高能物理向高亮度、高能量、高精度方向的发展趋势，对时间投影室提出了更高的计数率要求。在自制厚型气体电子倍增器（THGEM）取得成功的基础上，我们提出高电子透过率及高阳离子抑制能力的基于THGEM的TPC读出方案，设计两种新型的THGEM探测器：大孔小rim的THGEM和三电极结构的THGEM，采用错层结构，制作具有较高计数率性能的TPC探测器样机。本项目的研究成果可直接应用在未来的对撞物理、重离子物理等实验上。

Nowadays the high energy physics is trend to high luminosity, high energy, and high precision. As one of the most commonly used 3D tracking detector, higher counting rate capability of time projection chamber (TPC) is needed. Based on the thick gaseous electron multiplier (THGEM) developed by our group, we propose a high electron transfer efficiency (ETE) and high ion back flow (IBF) suppression solution for TPC readout. It consists of two kinds of THGEM, one has a larger hole with smaller rim to keep the high ETE, the other one is triple electrodes THGEM to suppress the IBF. A TPC prototype based on THGEMs with mis-aligned configuration is also proposed. The result of this project can be directly used in collision physics, heavy ion collision physics and other physic topics.