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TY - UNPB AU - Wilhelm, P. ED - Schaa, Volker RW ED - Marx, Michaela ED - Tilmont, Manuel TI - Electron Cooling of Bunched Ion Beams and Recent Results at the Heidelberg Cryogenic Storage Ring (CSR) J2 - Proc. of COOL2017, Bonn, Germany, 18-22 September 2017 C1 - Bonn, Germany T2 - Workshop on Beam Cooling and Related Topics T3 - 11 LA - english AB - The cryogenic storage ring CSR is an electrostatic machine of 35 m circumference for positive and negative ions at up to 300 keV kinetic energy per charge. Vacuum chambers and ion optics are cooled to well below 10 K by a closed-cycle He system. Rest gas densities down to a room-temperature equivalent pressure of <10⁻¹⁴ mbar and 1/e ion-beam lifetimes up to ~45 min were observed*. With rotationally cold diatomic ions, photodissociation Feshbach resonances of CH⁺ (J=0,1,2) were reported**. By time-dependent laser photodetachment, free-space radiative lifetimes of OH⁻ ions (J=1,2) up to ~190 s were measured***. An electron cooling device with a cryogenic (high-temperature superconducting) magnet and beam-merging system was taken into operation with an electron beam of ~40 eV from the TSR GaAs photocathode system****. It was applied to perform bunched-beam electron cooling of 1200 keV F(6+) ions. Future research will be devoted to interaction studies between stored atomic, molecular and cluster ions and laser, electron and neutral particle beams. Electron-beam studies (meV relative energies) will focus on dissociative recombination and state-changing collisions of molecular ions. PB - JACoW CP - Geneva, Switzerland ER -