标题： HERA-B环形切连科夫计数器 显示英文标题

标题： The HERA-B Ring Imaging Cherenkov Counter

摘要： HERA-B RICH 使用 2.8 米的辐射路径长度在 C_4F_10 气体中，并使用一个 24 平方米的球面镜来成像切连科夫环。 光探测器由 2240 个滨松多阳极光电倍增管组成，大约有 27000 个通道。 每个 PMT 前面有一个 2:1 的减小双透镜望远镜，以增加敏感区域，但导致像素尺寸增大，从而对分辨率的贡献大致与色散相当。 该计数器于 1999 年 1 月完成，多年来其性能一直稳定可靠。 RICH 的设计性能得到了充分实现：对于 β=1 粒子，RICH 中检测到的平均光子数为 33，单次命中分辨率为 0.7 mrad 和 1 mrad，分别对应精细和粗粒度区域。 显示英文摘要

摘要： The HERA-B RICH uses a radiation path length of 2.8 m in C_4F_10 gas and a large 24 square meters spherical mirror for imaging Cherenkov rings. The photon detector consists of 2240 Hamamatsu multi-anode photomultipliers with about 27000 channels. A 2:1 reducing two-lens telescope in front of each PMT increases the sensitive area at the expense of increased pixel size, resulting in a contribution to the resolution which roughly matches that of dispersion. The counter was completed in January of 1999, and its performance has been steady and reliable over the years it has been in operation. The design performance of the RICH was fully reached: the average number of detected photons in the RICH for a beta=1 particle was found to be 33 with a single hit resolution of 0.7 mrad and 1 mrad in the fine and coarse granularity regions, respectively.