SLAC的极化电子源Laser系统和E-158宇称破坏实验中电子束螺旋度关联的最小化
SLAC's Polarized Electron Source Laser System and Minimization of Electron Beam Helicity Correlations for the E-158 Parity Violation Experiment
摘要：
SLAC E-158是一个首次测量莫勒散射宇称破坏的实验。E-158将测量液氢靶中非极化电子对45-GeV极化电子束的弹性散射中的左右截面不对称性A_LR^Moller。E-158计划测量预期的约10^-7的标准模型不对称性，以达到优于10^-8的精度。为了进行该测量，偏振电子源需要强圆偏振激光束的操作以及在右螺旋度偏振状态和左螺旋度偏振状态之间快速切换的能力，其中所得到的束参数（强度、位置、角度、光斑尺寸和能量）中具有最小的右-左螺旋度相关不对称性，即束A_LR。该激光束由独特的SLAC设计的闪光灯泵浦Ti：Sapphire激光器产生，并通过精心设计的偏振光学器件进行传播。我们分析了近圆偏振光通过光学系统的传输，并确定了产生光束A_LR的几种机制。我们表明，占主导地位的影响线性依赖于特定的偏振相移的光学系统。我们介绍了激光系统的设计和讨论的抑制和控制的^光束A_LR的。我们还介绍了工程和物理运行的E-158的光束性能的结果。
英文摘要：
SLAC E-158 is an experiment designed to make the first measurement of parity violation in Moller scattering. E-158 will measure the right-left cross-section asymmetry, A_LR^Moller, in the elastic scattering of a 45-GeV polarized electron beam off unpolarized electrons in a liquid hydrogen target. E-158 plans to measure the expected Standard Model asymmetry of ~10^-7 to an accuracy of better than 10^-8. To make this measurement, the polarized electron source requires for operation an intense circularly polarized laser beam and the ability to quickly switch between right- and left-helicity polarization states with minimal right-left helicity-correlated asymmetries in the resulting beam parameters (intensity, position, angle, spot size, and energy), ^beam A_LR's. This laser beam is produced by a unique SLAC-designed flashlamp-pumped Ti:Sapphire laser and is propagated through a carefully designed set of polarization optics. We analyze the transport of nearly circularly polarized light through the optical system and identify several mechanisms that generate ^beam A_LR's. We show that the dominant effects depend linearly on particular polarization phase shifts in the optical system. We present the laser system design and a discussion of the suppression and control of ^beam A_LR's. We also present results on beam performance from engineering and physics runs for E-158.
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