Development of a compact in situ polarized He-3 neutron spin filter at Oak Ridge National Laboratory

作者：Jiang C Y^*; Tong X; Brown D R; Chi S; Christianson A D; Kadron B J; Robertson J L; Winn B L

来源：Review of Scientific Instruments, 2014, 85(7): 075112.

DOI：10.1063/1.4890391

• 3He neutron spin filters
• Hybrid spectrometers
• Neutron instruments
• Neutron polarization
• Neutron polarizers
• Oak ridge National Laboratory
• Spin exchange optical pumping
• Triple axis spectrometers

We constructed a compact in situ polarized He-3 neutron spin filter based on spin-exchange optical pumping which is capable of continuous pumping of the He-3 gas while the system is in place in the neutron beam on an instrument. The compact size and light weight of the system simplifies its utilization on various neutron instruments. The system has been successfully tested as a neutron polarizer on the triple-axis spectrometer (HB3) and the hybrid spectrometer (HYSPEC) at Oak Ridge National Laboratory. Over 70% He-3 polarization was achieved and maintained during the test experiments. Over 90% neutron polarization and an average of 25% transmission for neutrons of 14.7 meV and 15 meV was also obtained.

• 出版日期2014-7