电子-离子对撞机自旋光偏振计的发展现状
An update on the developmental status of the Spin-Light Polarimeter for the Electron Ion Collider
摘要：
宇称违反电子散射（PVES）领域的精密实验是探索超越标准模型（SM）物理的主要方法之一。为未来的设施，如电子离子对撞机（EIC）设想的物理计划的很大一部分包括寻找SM之外的物理。在这里，我们提出了一种新的技术，利用空间不对称性的同步辐射产生的电子束通过摆动磁铁跟踪光束偏振的变化。如果要在EIC实现<0.5%旋光的目标，这种相对旋光仪可能是至关重要的。在本文中，我们更新了讨论的Geant 4模拟支持这项技术的发展。简要介绍了旋光仪装置及其基本原理。作为模拟的一部分，电子束电流和束能量的影响进行了研究，这被发现是在很宽的范围内的电子束能量和束电流的管理。据发现，这样的相对偏振计最好的作品在4-20 GeV的制度。
英文摘要：
Precision experiments in the parity violating electron scattering (PVES) sector is one the leading methods to probe physics beyond the standard model (SM). A large part of the physics program being envisioned for future facilities such as the Electron Ion Collider (EIC) includes searching for physics beyond SM. Here, we present a novel technique which uses spacial asymmetry of synchrotron radiation produced by an electron beam passing through a wiggler magnet to trace the changes in beam polarization. Such a relative polarimeter could be vital if the goal of <0.5% polarimetry is to be achieved at EIC. In this paper, we update the discussion on the development of this technique supported by a Geant4 simulation. The polarimeter apparatus along with the underlying basic ideas are briefly introduced. As a part of the simulation, the effects of electron beam current and beam energy were studied which were found to be manageable over a wide range of electron beam energies and beam currents. It was found that such a relative polarimeter works best in the 4-20 GeV regime.
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