核子自旋不对称性实验的阈气切伦科夫探测器
A Threshold Gas Čerenkov Detector for the Spin Asymmetries of the Nucleon Experiment
摘要：
我们报告的设计，建造，调试和性能的阈值气体Čerenkov计数器在一个开放的配置，它在高亮度的环境中工作，并产生高的光电子产率。作为一个独特的开放几何探测器包的一部分，被称为大电子望远镜阵列，这个切伦科夫计数器用于识别散射电子，并在托马斯·杰斐逊国家加速器设施（TJNAF）的核子实验E07-003的自旋不对称性中拒绝产生π介子。该实验包括极化电子束撞击极化氨靶的双自旋不对称性$A_{\parallel}$和$A_{\perp}$的测量。切伦科夫计数器的性能特点是每个电子或正电子轨道产生约20个光电子。由于每个径迹有大量的光电子，切伦科夫计数器有足够的分辨率来识别主要由$π^0$衰变产生的光子转换中的电子-正电子对。
英文摘要：
We report on the design, construction, commissioning, and performance of a threshold gas Čerenkov counter in an open configuration, which operates in a high luminosity environment and produces a high photo-electron yield. Part of a unique open geometry detector package known as the Big Electron Telescope Array, this Čerenkov counter served to identify scattered electrons and reject produced pions in an inclusive scattering experiment known as the Spin Asymmetries of the Nucleon Experiment E07-003 at the Thomas Jefferson National Accelerator Facility (TJNAF) also known as Jefferson Lab. The experiment consisted of a measurement of double spin asymmetries $A_{\parallel}$ and $A_{\perp}$ of a polarized electron beam impinging on a polarized ammonia target. The Čerenkov counter's performance is characterised by a yield of about 20 photoelectrons per electron or positron track. Thanks to this large number of photoelectrons per track, the Čerenkov counter had enough resolution to identify electron-positron pairs from the conversion of photons resulting mainly from $π^0$ decays.
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