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TY - UNPB AU - Wolf, A. ED - Akers, Evelyn (Jefferson Lab), Satogata, Todd Satogata (Jefferson Lab), Schaa, Volker RW Schaa (GSI) TI - First Operation of the Heidelberg Cryogenic Storage Ring CSR for Low-Energy Collision Measurements With Molecular Ion Beams J2 - Proc. of COOL2015, Newport News, VA, USA, September 28 - October 2, 2015 C1 - Newport News, VA, USA T2 - International Workshop on Beam Cooling and Related Topics T3 - 10 LA - english AB - The cryogenic storage ring CSR** has performed its first cryogenic beamtime in the first half of 2015. All vacuum chambers and ion optics of the electrostatic ring of 35 m circumference were cooled well below 10 K. Positive and negative ion beams were stored with energies of 60 keV at storage time constants that exceeded 2000 s in some cases. In the extremely low residual gas pressures, products of collisional beam loss reactions became in many cases unobservable. Laser-induced photodetachment was observed from various atomic and molecular ions including O-, OH-, CH⁺, (Co2)-, (Ag2)-, (Co3)-. Photodetachment signals were used to monitor the ion beam lifetime. Populations of rotational levels in OH⁻ were monitored by photodetachment near threshold with a tunable laser. Radiative cooling of the OH⁻ ions was tracked over >5 min when more than 90% of the ions were found in the J=0 state. Schottky signals of the ions were monitored over similar time intervals, indicating a slow increase of the momentum spread of the ions. Ion beam energies at CSR will reach up to 300 keV·q and a photocathode electron cooler is being installed for phase space cooling and collision experiments***. PB - JACoW CP - Geneva, Switzerland ER -