Negative muons of 28.6 Mev/c initial momentum were decelerated in and
extracted from the PSI anticyclotron equipped with a Mylar foil in the
median plane as moderator to provide a continuous mu- beam of 3-30 ke
V energy. This technique can also be used to post-decelerate LEAR anti
protons in a continuous or pulsed mode to keV energies with an efficie
ncy up to 10-20%.