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

Autor:	Jiang CY; Instrument and Source Design Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA., Tong X; Instrument and Source Design Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA., Brown DR; Instrument and Source Design Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA., Chi S; Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA., Christianson AD; Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA., Kadron BJ; Instrument and Source Design Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA., Robertson JL; Instrument and Source Design Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA., Winn BL; Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Jazyk:	angličtina
Zdroj:	The Review of scientific instruments [Rev Sci Instrum] 2014 Jul; Vol. 85 (7), pp. 075112.
DOI:	10.1063/1.4890391
Abstrakt:	We constructed a compact in situ polarized (3)He neutron spin filter based on spin-exchange optical pumping which is capable of continuous pumping of the (3)He 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% (3)He 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.
Databáze:	MEDLINE
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