A Focal Plane Polarimeter for CEBAF

罗格斯大学和 W&M 小组将建造一台焦平面偏振计，供 CEBAF 使用。 与磁谱仪结合，该装置将确定电子散射和光子诱导敲除反应中产生的质子和其他强子的偏振态。 探测器由第二个散射目标（分析仪）以及分析仪前后的跟踪室组成。 从第二散射角分布中提取的偏振测量将用于测量质子形状因子，对核子模型、核结构以及电子散射涉及的反应机制进行关键测试。 将开发线室阵列、分析仪、支撑结构和相关的快速电子信号处理器。

A focal plane polarimeter will be constructed for use at CEBAF by the Rutgers and W&M groups. In conjunction with a magnetic spectrometer, this device will determine the polarization state of protons and other hadrons produced in electron scattering and photon induced knockout reactions. The detector consists of a second scattering target (analyzer) plus tracking chambers before and after the analyzer. Measurement of the polarization, extracted from the second scatter angular distribution, will be used to measure the proton form factor, perform critical tests of models of the nucleon, of nuclear structure, and of reaction mechanisms involved in electron scattering. Wire chamber arrays, analyzer, support structure, and associated fast electronic signal processors will be developed.