Hannover 2016 – wissenschaftliches Programm
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SYML: Symposium From First Molecules to Life
SYML 2: Molecules and Ions in Isolation
SYML 2.2: Vortrag
Mittwoch, 2. März 2016, 15:00–15:15, e415
First Cold Operation of the Cryogenic Storage Ring (CSR) — •Stephen Vogel1, Arno Becker1, Klaus Blaum1, Christian Breitenfeldt1,2, Sebastian George1, Jürgen Göck1, Manfred Grieser1, Florian Grussie1, Philipp Herwig1, Jonas Karthein1, Claude Krantz1, Holger Kreckel1, Sunil Kumar1, Jorrit Lion1, Svenja Lohmann1, Christian Meyer1, Preeti M. Mishra1, Oldřich Novotný1, Aodh P. O’Connor1, Roland Repnow1, Kaija Spruck1,3, Stefan Schippers3, Dirk Schwalm1,4, Lutz Schweikhard2, Robert von Hahn1, and Andreas Wolf1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, Germany — 3Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany — 4Weizmann Institute of Science, Rehovot 76100, Israel
CSR is an electrostatic storage ring for ions of <300 keV per unit charge kinetic energy. The ion beam optics and vacuum chambers of the 35-m circumference ring can be cryogenically cooled. The ring was cooled down with 4-K liquid He in 28 cryopumping units, starting from near 10−10 mbar vacuum at 300 K. Ion beams of 60–90 keV were stored for species including Ar+, OH−, CH+, C2−, Co2−, Ag2− and Co3−. With the cold ring, extensive non-destructive beam diagnostics were performed including Schottky-noise and beam-position detection. Beam lifetimes up to 2500 s were measured by laser photodetachment. Inelastic collisions of the stored ions with rest gas molecules were nearly undetectable, indicating <100 cm−3 rest-gas density (corresponding to <10−14 mbar pressure at 300 K). Rotational cooling of OH− ions to >95% in J=0 was shown by near-threshold photodetachment.