Mainz 2017 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 7: Poster
MS 7.6: Poster
Mittwoch, 8. März 2017, 17:00–19:00, P OG1
Operating a low-energy electron cooler at the Cryogenic Storage Ring CSR — •Marius Rimmler, Arno Becker, Claude Krantz, Jorrit Lion, Svenja Lohmann, Oldřich Novotný, Sunny Saurabh, Stephen Vogel, Patrick Wilhelm, and Andreas Wolf — Max-Planck-Institut für Kernphysik, Heidelberg, Germany
The Cryogenic Storage Ring CSR is an experimental platform for reaction studies on atomic, molecular and cluster ions stored for hours in a cryogenic enviroment and in a vacuum better than 10−14 mbar. Fundamental reaction dynamics can be probed, while the ions relax toward lower internal energy, in some cases reaching the ro-vibrational ground state. In these experimental studies well-defined overlaps in merged-beam experiments can be attained by minimizing the ion beam’s emittance through phase-space cooling. This proceeds by Coulomb collisions when a low-energy-spread electron beam is merged with the ion beam. In CSR we have implemented such an electron beam device operating at cryogenic conditions.
The cold electrons are produced by a GaAs photocathode and merged with the stored ion beam via a magnetic guiding field using high-temperature superconduting coils. To perform velocity-matched electron cooling of slow heavy ions, the CSR electron cooler was designed to supply electron energies as low as 1eV. It is scheduled to operate during the upcoming cold CSR beam-time(spring 2017). The systematic studies on the performance of the electron cooler in terms of cooling times will be presented.