Erlangen 2018 – scientific programme

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MO: Fachverband Molekülphysik

MO 24: Experimental Techniques

MO 24.3: Talk

Friday, March 9, 2018, 11:00–11:15, PA 2.150

Electron cooling of bunched ion beams and experimental program of the CSR electron merged beam setup — •Patrick Wilhelm, Arno Becker, Claude Krantz, Jorrit Lion, Svenja Lohmann, Oldřich Novotný, Marius Rimmler, Sunny Saurabh, Stephen Vogel, and Andreas Wolf — Max Planck Institute for Nuclear Physics, Heidelberg, Germany

In the Cryogenic Storage Ring (CSR) molecular ions are stored for hundreds to thousands of seconds in a low-temperature radiation field given by the black-body radiation of the beamline wall at less than 10 K. By this stored molecular and cluster ions can undergo radiative relaxation toward their ro-vibrational ground-state. Measurements probing fundamental molecular and cluster dynamics can be performed with good internal state definition. For ion-beam phase-space cooling a low-energy electron cooler was set up for the CSR. Cold electrons are produced by a LN2-cooled GaAs photocathode. Merging of the electrons with the stored ion beam is realized by a magnetic guiding field which is created by a set of high-temperature superconducting solenoids, toroids and racetrack coils. The CSR electron cooler is designed to achieve an average kinetic electron-beam energy as low as 1 eV at a rest-frame energy spread of about 1 meV. It was succesfully taken into operation in June 2017. A ∼40 eV electron beam was merged with a 1200 keV F⁶+ ion beam and bunched-beam electron cooling has been demonstrated. Upcoming beamtimes will aim at phase-space cooling and high-resolution studies of electron-ion reactions.