Electron cooler at INS

An electron cooling system for compressing phase spaces occupied by the ion beams stored in the heavy-ion synchrotron-storage ring TARN II has been developed. The cooling device was designed to cool ion beams up to the energy of 200 MeV/u, which requires an equivalent electron energy of 110 keV. All the components of the device were assembled, and the first electron beam was obtained in the complete cooler. The overall design of the electron cooling system is described, and the results of the electron beam experiments are presented.<>