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Maintaining high levels of 3He polarization over long periods of time isimportant to many areas of fundamental and particle beam physics. Longmeasurement times are often required in such experiments and the data qualityis a function of the 3He polarization. This is the case for neutron scatteringwhere the 3He can be used to analyze the spin of a scattered neutron beam andrelatively small fluxes of polarized neutrons leads to experiment times longerthan several days. Consequently the J\"ulich Centre for Neutron Science (JCNS)is developing spin-exchange optical pumping (SEOP) systems capable ofpolarizing the 3He gas in place on a typical neutron instrument. Using apolarizer device we constructed a high level of 3He polarization of 81 % \pm2%was maintained with good time stability. Such levels of polarization maintainedover time will be able to reduce the measurement times for such experiments andeliminate time dependent data corrections.

High level of $^3$He polarization of 81\% Maintained in an on-beam $^3$He spin filter using SEOP