Experience with stochastic cooling of particle beams

A review of stochastic cooling (St.C.) systems in several machines, which are or have been in use or are under construction is given. It includes a discussion on operational performance, improvements after startup and practical limitations. Bunched beam stochastic cooling has been a challenge since many years and it appears that the reasons for the difficulties experienced in the past are better understood now. For the design of future St.C. systems some hints on practical and theoretical issues are presented as well as a collection of diagnostic tools for running-in and for operation of St.C. systems.