用于光电阴极表征的低电压延迟场Mott偏振仪
A low-voltage retarding-field Mott polarimeter for photocathode characterization
摘要：
托马斯·杰斐逊国家加速器设施的CEBAF的核物理实验依赖于高极化电子束。我们描述了一个最近委托的资格预审和研究光电阴极CEBAF与负载锁定，低电压极化电子源耦合到一个紧凑的延迟场莫特偏振计系统。旋光仪使用简化的电极结构，工作电压为5至30 kV。通过与CEBAF 5 MeV Mott旋光仪的比较，对该装置的有效Sherman函数进行了校准。对于20 keV厚金靶的弹性散射，有效谢尔曼函数为0.201（5）。其在20 keV下的最大效率（定义为检测到的计数率除以入射粒子电流）为5.4（2）x 10-4，产生的品质因数或分析功率平方乘以效率为1.0（1）x 10-5。这种新的旋光仪设计的操作参数进行比较，以前公布的数据为其他紧凑型莫特旋光仪的延迟场类型。
英文摘要：
Nuclear physics experiments at Thomas Jefferson National Accelerator Facility's CEBAF rely on high polarization electron beams. We describe a recently commissioned system for prequalifying and studying photocathodes for CEBAF with a load-locked, low-voltage polarized electron source coupled to a compact retarding-field Mott polarimeter. The polarimeter uses simplified electrode structures and operates from 5 to 30 kV. The effective Sherman function for this device has been calibrated by comparison with the CEBAF 5 MeV Mott polarimeter. For elastic scattering from a thick gold target at 20 keV, the effective Sherman function is 0.201(5). Its maximum efficiency at 20 keV, defined as the detected count rate divided by the incident particle current, is 5.4(2) x 10-4, yielding a figure-of-merit, or analyzing power squared times efficiency, of 1.0(1) x 10-5. The operating parameters of this new polarimeter design are compared to previously published data for other compact Mott polarimeters of the retarding-field type.
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