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Polarized ~~3He neutron spin filter program at the JCNS

机译:JCNS的极化~~ 3He中子自旋滤波器程序

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摘要

Polarized neutron instruments will occupy about 80% of the Jülich Centre for Neutron Science (JCNS) instrument park. A successful polarized ~~3He program will be integral to many of these instruments. We have been focusing the developments on spin-exchange optical pumping (SEOP) to polarize the ~~3He gas in situ. Where possible, in situ polarization using the SEOP method will provide higher time averaged performance of the instruments. Further this allows a custom-built and independent source of polarized ~~3He to be developed optimized for each instruments demands. In this paper we will: present an argument for the advantages of in situ polarization; describe an in situ polarizer we have constructed, and initial tests of its performance; describe testing of polarization analysis for small angle neutron scattering on biological samples, and our plans for an in situ polarizer for this application.
机译:极化中子仪器将占据约利希中子科学中心(JCNS)仪器园的80%。成功的极化~~ 3He程序将成为许多此类仪器不可或缺的一部分。我们一直致力于自旋交换光泵浦(SEOP)的开发,以使~~ 3He气体原位极化。在可能的情况下,使用SEOP方法进行原位极化将提供更高的时间平均性能。此外,这还允许针对每种仪器需求优化开发定制的,独立的极化~~ 3He光源。在本文中,我们将:针对原位极化的优势提出一个论点;描述我们制造的原位偏振片,并对其性能进行初步测试;描述了极化分析对生物样品上小角度中子散射的测试,以及我们针对该应用的原位偏振器计划。

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