Summary

The capabilities and future possibilities of in-tense polarized proton sources are summarized. The best Lamb-shift sources have achieved-4 PA of 8-. Atomic sources have achieved 6 “A ft- dc (30 “A pulsed) and 125 PA I? dc (200 pA pulsed). Planned developments are described which should increase the atomic source output current to the multi- milliampere range for both t?+ and fr. Opt ical pumping techniques have succeeded in producing 25 PA of d- and 200 pA of w. Polarized ion sources using optical pumping which may eventually lead to amperes of 8- have been proposed