超B工厂带电粒子识别的成像传播时间系统
An imaging time-of-propagation system for charged particle identification at a super B factory
摘要：
超级B工厂将进一步探索标准模型的风味部门和超越物理学，将需要出色的带电粒子识别（PID），特别是K/pi分离，动量高达4 GeV/c，以及在比当前B工厂实验高得多的束背景下操作的能力。我们描述了一个成像时间的传播（iTOP）检测器，显示出显着的潜力，以满足这些要求。在切伦科夫辐射棒中从带电粒子相互作用发射的光子被内部反射到棒的末端，在那里它们被收集在紧凑的图像平面上，使用具有二维精细空间分割的光电探测器。光子到达时间的精确测量用于增强二维成像，从而允许系统在减小的探测器包络内提供优异的PID能力。这种检测器的几何和物理特性的持续优化的结果，以及模拟PID性能。目前正在夏威夷大学的宇宙射线试验台上使用一个原型对模拟进行验证。
英文摘要：
Super B factories that will further probe the flavor sector of the Standard Model and physics beyond will demand excellent charged particle identification (PID), particularly K/pi separation, for momenta up to 4 GeV/c, as well as the ability to operate under beam backgrounds significantly higher than current B factory experiments. We describe an Imaging Time-of-Propagation (iTOP) detector which shows significant potential to meet these requirements. Photons emitted from charged particle interactions in a Cerenkov radiator bar are internally reflected to the end of the bar, where they are collected on a compact image plane using photodetectors with fine spatial segmentation in two dimensions. Precision measurements of photon arrival time are used to enhance the two dimensional imaging, allowing the system to provide excellent PID capabilities within a reduced detector envelope. Results of the ongoing optimization of the geometric and physical properties of such a detector are presented, as well as simulated PID performance. Validation of simulations is being performed using a prototype in a cosmic ray test stand at the University of Hawaii.
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