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DESCRIPTION:Chenyang Jiang\, ORNL\n\nThe unique advantages of using polariz
ed 3He as neutron spin filters\, such as broadband and wide ang
ular acceptance of neutron beams\, have made it widely used among neutron
scattering communities. Here we report the current status of the polarized
3He development at the Oak Ridge National Laboratory (ORNL). O
ver the last several years\, we have developed a robust polarized 3
sup>He program to meet the increasing needs of 3He based neutro
n spin filters at ORNL’s High Flux Isotope Reactor (HFIR) and Spallation
Neutron Source (SNS). At ORNL\, spin-exchange optical pumping is used to
produce polarized 3He. Two optical pumping stations have been b
uilt in the lab to perform ex situ pumping of 3He. In order to
solve the complications in data analysis brought by the 3He pol
arization relaxation in the ex situ pumping\, we have constructed in situ
pumping systems for several beamlines which has produced very high 3<
/sup>He polarization (76%) and the polarization has been maintained throug
hout the experiments. In addition\, a novel polarized 3He filli
ng station for the Hybrid Spectrometer (HYSPEC) at SNS is under developmen
t. We will present the preliminary test results of this system.
DTSTART:20131210T203000Z
LOCATION:Physics Building\, Room 218
SUMMARY:The Development of Polarized 3He Neutron Spin Filters at the Oak Ri
dge National Laboratory
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