PROBING A COOLED BEAM OF DECELERATED HIGHLY-CHARGED HEAVY-IONS EXTRACTED OUT OF THE ESR BY A CHANNELING EXPERIMENT

A cooled beam of decelerated highly-charged heavy ions is slowly extra cted out of the cooler and storage ring ESR, by combining the decelera tion technique and the charge exchange extraction mode. The quality of the external ion beam is tested by a channeling experiment. Bare AU(7 9+) ions are injected into the ESR at an energy of 360 MeV/u, decelera ted to 53 MeV/u, and finally cooled strongly in the electron cooler. B y breeding of neighboring charge state ions via radiative recombinatio n in the electron cooler H-like ions are produced. The H-like ion frac tion is extracted out of the storage ring. This extracted Au78+ ion be am is probed by a channeling experiment measuring the extinction rate of the projectile K alpha X-ray yield around the [110] axis of a thin silicon crystal.