Hannover 2016 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Posters 3: Novelties in Molecular Physics: Theory of Molecular Dynamics, Collisions and Energy Transfer, and Experimental Techniques

MO 14.8: Poster

Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof

The low-energy electron cooler for the Cryogenic Storage Ring (CSR) — •Patrick Wilhelm, Klaus Blaum, Claude Krantz, Jorrit Lion, Svenja Lohmann, Oldřich Novotný, Stephen Vogel, and Andreas Wolf — Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Deutschland

In the recently commissioned Cryogenic Storage Ring CSR, molecular ions are stored for hundreds to thousands of seconds in a low temperature radiation field with a mean temperature below 10 K. By this, stored ionic molecules and clusters can undergo radiative relaxation down toward their ro-vibrational ground-state. Measurements probing fundamental molecular and cluster dynamics can be performed with good internal state definition. For phase-space cooling and for high-precision electron-ion reaction experiments, a low-energy velocity-matched merged electron beam device is set up for the cryogenic environment. Cold electrons are produced by a GaAs photocathode setup at 300 K. The merging of the electrons with the stored ion beam is realized by a cryogenic magnetic guiding field created by a set of solenoids, toroids and racetrack coils made from high-temperature superconductors. The CSR electron cooler is designed to achieve an average kinetic electron beam energy of as low as 1 eV at a thermal energy spread of about 1 meV. The manufacturing process of the cooler system is completed; implementation in the storage ring and commissioning are planned for the first half of 2016.