Speaker
Description
The cryogenic storage ring CSR is a fully electrostatic storage ring used to store atomic, molecular and cluster ion beams in the energy range of q·(20-300) keV, where q is the absolute value of the ion charge state. The entire storage ring can be cooled down to temperatures of only a few Kelvin. This very low temperature creates an extremely low residual gas density. The observations from first cryogenic operation indicate the residual gas densities below 100 molecules/cm^3. The cooling of all ion optics and the vacuum enclosure to 10 K temperature also provides the benefit of uniquely low level of blackbody radiation where the stored molecular ion beams reach their lowest quantum states. In March 2014 the functionality of CSR was demonstrated by storing a 50 keV 40Ar+ beam under room temperature conditions. Later, in 2015, the storage ring was cooled down to an average temperature below 10 K. At this temperature the storage time for singly charged ions achieved up to 2500 s. Electron cooling could be proven in the last two years with molecular ion beams (HeH+, HD+) with energies of 125 and 250 keV as well with an atomic ion beam F6+ (E=1.34 MeV). In the case of the molecular ion beams a transverse and longitudinal cooling time in the range of 1 to 3 s could be measured. In the talk an overview about the CSR will be given.