Polarized ion sources for high-energy accelerators (invited)

Motivated by experimental requirements at high energy accelerators, very large increases in polarized H − ion source current have been achieved recently. Polarized H − current of 1 mA dc from the optically pumped source (OPPIS) and 1 mA pulsed H − current from the atomic beam source (ABS) have been demonstrated. High current development of both the ABS and OPPIS is continuing. Pulsed current of more than 10 mA has been proven to be feasible from the OPPIS. An OPPIS is also used in the high precision parity violation experiment at TRIUMF, in which helicity-correlated changes to beam properties must be extremely small.