MEOP based 3He polarization and injection system for experiments below 1 K
Abstract
Metastability exchange optical pumping (MEOP) is a widely used technique for producing polarized 3He. In connection with an experiment to search for the electric dipole moment of the neutron (nEDM) we have built a MEOP based 3He polarization and injection system to prepare 80 % polarized 3He at room temperature which will be injected into a ~400 mK measurement cell filled with superfluid 4He. We describe the polarization and injection system, which is designed to allow for final concentrations of 10-8-10-10 of 80 % polarized 3He in the superfluid filled measurement cell. Only ≈0.72\% polarization loss due to gradients is expected during injection
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