标题： 基于Timepix3芯片的GridPix TPC读出系统的性能 显示英文标题

标题： Performance of a GridPix TPC readout based on the Timepix3 chip

摘要： 以开发ILC上TPC的基于像素的读出系统为最终目标，一个由一个集成放大网格的Timepix3芯片组成的GridPix读出系统被嵌入到原型探测器中。在波恩的ELSA加速器上，用2.5 GeV电子进行了测试束实验研究了其性能。在漂移方向和读出平面中的轨迹位置测量误差主要由扩散引起。系统不确定度低于10 $\mu$m。GridPix可以高效地检测单个电离电子，这允许进行能量损失测量和粒子识别。通过截断求和，对于有效轨迹长度为1 m的情况，能量损失（dE/dx）分辨率为4.1%。使用相同类型的芯片，开发了一个Quad模块，可以拼接以覆盖ILC上的TPC读出平面。模拟研究表明，像素读出可以将ILC上TPC的动量分辨率提高约20%。 显示英文摘要

摘要： With the ultimate goal of developing a pixel-based readout for a TPC at the ILC, a GridPix readout system consisting of one Timepix3 chip with an integrated amplification grid was embedded in a prototype detector. The performance was studied in a testbeam with 2.5 GeV electrons at the ELSA accelerator in Bonn. The error on the track position measurement both in the drift direction and in the readout plane is dominated by diffusion. Systematic uncertainties are limited to below 10 $\mu$m. The GridPix can detect single ionization electrons with high efficiency, which allows for energy loss measurements and particle identification. From a truncated sum, an energy loss (dE/dx) resolution of 4.1% is found for an effective track length of 1 m. Using the same type of chips, a Quad module was developed that can be tiled to cover a TPC readout plane at the ILC. Simulation studies show that a pixel readout can improve the momentum resolution of a TPC at the ILC by about 20%.