论文标题
表演火炬飞行时间检测器的性能
Performance of a prototype TORCH time-of-flight detector
论文作者
论文摘要
Torch是一种新型飞行时间检测器，旨在在9.5 m的飞行路径上以2-20 GEV/C的动量范围2-20 GEV/C提供带电的颗粒鉴定。一个包含10mm厚的石英板的检测器模块提供了Cherenkov光子的来源，该光子通过整个内部反射传播到板的一端。在这里，光子聚焦在一系列定制设计的微通道板板光型管（MCP-PMTS）上，该管子测量其位置和到达时间。每个光子的目标时间分辨率为70 ps，对于每个带电粒子检测到的光子的30个PS，可以实现10-15 ps的飞行时间分辨率。已经开发了使用两种MCP-PMT的1.25 m长度的火炬原型模块，并使用8 GEV/C动量的带电强体束在CERN PS进行了测试。描述了模块的构建，MCP-PMT和读取电子的构建。收集的光子产量和单光子时间分辨率的测量是板上颗粒入口点的函数，并与预期进行了比较。这些研究表明，火炬原型的性能接近了全尺度检测器的设计目标。
TORCH is a novel time-of-flight detector, designed to provide charged particle identification of pions, kaons and protons in the momentum range 2-20 GeV/c over a 9.5 m flight path. A detector module, comprising a 10mm thick quartz plate, provides a source of Cherenkov photons which propagate via total internal reflection to one end of the plate. Here, the photons are focused onto an array of custom-designed Micro-Channel Plate Photo-Multiplier Tubes (MCP-PMTs) which measure their positions and arrival times. The target time resolution per photon is 70 ps which, for 30 detected photons per charged particle, results in a 10-15 ps time-of-flight resolution. A 1.25 m length TORCH prototype module employing two MCP-PMTs has been developed, and tested at the CERN PS using a charged hadron beam of 8 GeV/c momentum. The construction of the module, the properties of the MCP-PMTs and the readout electronics are described. Measurements of the collected photon yields and single-photon time resolutions have been performed as a function of particle entry points on the plate and compared to expectations. These studies show that the performance of the TORCH prototype approaches the design goals for the full-scale detector.
