用SEOP在束$^3$ He自旋滤波器中保持81\%的高水平$^3$ He极化
High level of $^3$He polarization of 81\% Maintained in an on-beam $^3$He spin filter using SEOP
摘要：
在很长一段时间内保持高水平的3 He极化对基础物理和粒子束物理的许多领域都很重要。在这样的实验中通常需要长的测量时间，并且数据质量是3 He极化的函数。这是中子散射的情况，其中3 He可以用于分析散射中子束的自旋，并且相对小的极化中子通量导致实验时间长于几天。因此，于利希中子科学中心（JCNS）正在开发能够在典型的中子仪器上极化3 He气体的自旋交换光学泵浦（SEOP）系统。使用偏振器装置，我们构建了81%的高水平的3 He偏振\pm 2%保持良好的时间稳定性。这种随时间保持的偏振水平将能够减少这种实验的测量时间并消除时间相关的数据校正。
英文摘要：
Maintaining high levels of 3He polarization over long periods of time is important to many areas of fundamental and particle beam physics. Long measurement times are often required in such experiments and the data quality is a function of the 3He polarization. This is the case for neutron scattering where the 3He can be used to analyze the spin of a scattered neutron beam and relatively small fluxes of polarized neutrons leads to experiment times longer than several days. Consequently the Jülich Centre for Neutron Science (JCNS) is developing spin-exchange optical pumping (SEOP) systems capable of polarizing the 3He gas in place on a typical neutron instrument. Using a polarizer device we constructed a high level of 3He polarization of 81 % \pm2% was maintained with good time stability. Such levels of polarization maintained over time will be able to reduce the measurement times for such experiments and eliminate time dependent data corrections.
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