Spin-exchange polarization study at the TRIUMF OPPIS

The TRIUMF optically pumped polarized ion source (OPPIS) now produces 56 μA H− ion current and 85% polarization for routine operation and 120 μA and 78% polarization in high current mode. This is a result of the latest ECR primary proton source improvements and optimization of optical pumping efficiency. It has been shown that in a pulsed mode suitable for high energy accelerator applications, it is possible to produce 1–2 mA of polarized H− current in a charge‐exchange OPPIS based on the INR‐scheme(1). A possible INR‐scheme upgrade to the 10 mA range is discussed. The experimental results on spin‐exchange polarization presented in this paper hold promise of polarized H− current increasing to the 10 mA range.