ACOL stochastic cooling systems

The CERN Antiproton Collector cooling systems are designed to reduce the transverse emittances and the momentum spread by one order of magnitude in the duty cycle of the proton synchrotron. Fast cooling is obtained using a 2 GHz bandwidth split into three equal sub-bands. Limitations due to weak input signals and to high output power are overcome by using cryoelectronics techniques and by maintaining the electrodes close to the beam while the beam envelope is shrinking. The characteristics of the main components: mobile electrodes, combiner/splitter structures, preamplifiers, solid state power amplifiers and filters are reviewed. A short description of the new cooling systems in the accumulator ring is also given