High level of 3He polarization maintained in an on-beam 3He spin filter using SEOP
High level of 3He polarization maintained in an on-beam 3He spin filter using SEOP
复制标题
使用 SEOP 在束上 3He 旋转滤光片中保持高水平 3He 偏振
DOI：
10.1016/j.nima.2010.09.078
复制
发表时间：
2010
影响因子：
1.4
通讯作者：
A. Ioffe
中科院分区：
文献类型：
--
作者：
E. Babcock;S. Mattauch;A. Ioffe
在很长一段时间内保持高水平的~3He偏振对于许多基础和粒子束物理领域非常重要。在这样的实验中，通常需要很长的测量时间，而数据质量是3He偏振的函数。这就是中子散射的情况，3He可以用来分析散射的中子束的自旋。对于中子散射，极化中子的通量相对较小，导致实验时间长于几天。因此，Jülich中子科学中心(JCNS)正在开发能够在典型的中子仪器上就地极化3He气体的自旋交换光学泵浦(SEOP)系统。用我们制作的偏振器，获得了80.4%±1.5%的很高的~3He偏振水平，并保持了良好的时间稳定性。具有随时间稳定的如此高的偏振水平将减少此类实验的测量时间，并消除依赖于时间的数据校正。
Maintaining high levels of3He polarization over long periods of time is important for 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 the3He polarization. This is the case for neutron scattering, where the3He can be used to analyze the spin of a scattered neutron beam. For neutron scattering, the relatively small fluxes of polarized neutrons lead 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 the3He gas in place on a typical neutron instrument. With the polarizer we have constructed, a very high level of3He polarization of 80.4%±1.5% was obtained and maintained with good time stability. Having such high levels of polarization that are stable over time will reduce the measurement times for such experiments and eliminate time-dependent data corrections.