HIRFL-CSR electron cooler commissioning

HIRFL-CSR, a new ion cooler-storage ring, is under construction at IMP. It is equipped with two electron cooling devices. The technical parameters of the project will be reviewed briefly. The HIRFL-CSR cooler could be a new generation cooler with some unique features such as a new electron gun capable to produce hollow electron beam, electrostatic bending plates and a new structure of solenoid coils at the cooling section. The commissioning of the first cooler with electron beam at IMP was completed. The second cooler with energy 300 keV is under final assembling.