STOCHASTIC COOLING IN THE CERN ANTIPROTON ACCHMlJLATOR S. van der Meer CERN

A short description of the machine is followed by a review of the eight different cooling systems. Some new filter types used for the precooling system are presented, as well as initial experimental results. General Description of the Machine The Antiproton Accumulator (AA) was built to collect antiprotons at the rate of 'L 6 x 1Ol1 per day for use in pp collision experiments in the SPS (2 x 270 GeV/c), the ISR (2 x 26 GeV/c), or for low-energy i experiments with a small storage ring called LEAR that is now under construction. The antiprotons are produced in a target by 26 GeV/c protons and in-jected into the AA ring at 3.5 GeV/c (near the pro-duction peak) where they are cooled and stacked. The most unusual feature of this machine is th