Diagnostics for Electron Cooled Beams

Nearly all modern hadron storage/accumulator rings use an electron cooling device to increase the phase space density of the circulating beam before its transfer to another accelerator or to the experiments. For fast and efficient cooling, the properties of the electron and hadron beams need to be monitored before, during and after the cooling process in a non-destructive manner in order not to perturb the normal operation of the machine. In this paper we review the various techniques used to measure and optimise the different parameters that determine the quality of the cooling.