HERA的纵向偏振仪
The Longitudinal Polarimeter at HERA
摘要：
本文介绍了DESY HERA储存环上的康普顿背散射激光偏振计的设计、结构和工作情况。该设备测量的纵向极化的电子束之间的自旋旋转器在HERMES实验的分数系统的不确定度为1.6%。当设备在多光子模式下操作时，对0.01的绝对统计精度的射束偏振的测量通常需要一分钟。偏振计还测量每个单独电子聚束的偏振，在大约5分钟内达到0.06的绝对统计精度。发现碰撞和非碰撞聚束可以具有显著不同的偏振。这一信息对于对撞机实验H1和ZEUS未来的纵向极化电子计划非常重要，因为这些实验只使用碰撞聚束。
英文摘要：
The design, construction and operation of a Compton back-scattering laser polarimeter at the HERA storage ring at DESY are described. The device measures the longitudinal polarization of the electron beam between the spin rotators at the HERMES experiment with a fractional systematic uncertainty of 1.6%. A measurement of the beam polarization to an absolute statistical precision of 0.01 requires typically one minute when the device is operated in the multi-photon mode. The polarimeter also measures the polarization of each individual electron bunch to an absolute statistical precision of 0.06 in approximately five minutes. It was found that colliding and non-colliding bunches can have substantially different polarizations. This information is important to the collider experiments H1 and ZEUS for their future longitudinally polarized electron program because those experiments use the colliding bunches only.
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