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Description
The Optically Pumped Polarized Ion Source (OPPIS) provided polarized H$^-$ to the injector chain of the RHIC. The scheme used in the OPPIS is as follows: An atomic hydrogen beam produced by an external source is injected into a He-gas ionizer cell inside a high magnetic field solenoid to produce a proton beam. This proton beam then passes through an optically pumped Rb vapor cell and picks up a polarized electron. The polarization is transferred to the proton through a spin-exchange transition. Finally, the polarized H atom passes through a sodium cell and picks up an extra electron and is extracted at 35 keV. The use of a high-brightness primary beam and large cross-sections of charge-exchange cross-sections resulted in the production of a high-intensity H$^-$ ion beam of 85% polarization. High beam brightness and polarization resulted in 75% polarization at 23 GeV out of the AGS and 60-65% beam polarization at 100-250 GeV colliding beams in RHIC.
We are also developing a high-intensity (2e$^{11}$ ions per pulse) 3He$^{++}$ polarized ion source for the future Electron Ion Collider (EIC). This source will use a new technique which is based on the polarization of accumulated ultra-pure 3He gas in a high magnetic field by metastability-exchange optical pumping. Polarized gas will be ionized by the electron beam of the existing Electron Beam Ion Source (EBIS). An infrared laser system for pumping and measurement in the high field of EBIS has been developed. In the test setup, polarization of 80-85% has been achieved for ultra-pure 3He gas in the "Open" cell configuration with refilling valve tube inlet and isolation valve closed. The development of the spin-rotator and 3He-4He absolute nuclear polarimeter at 6 MeV 3He$^{++}$ beam energy is also presented.
