Hamburg 2009 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 3: Präzisionsmassenspektrometrie, Ionenfallen, FT-IZR-MS, Moleküle, Cluster III

MS 3.6: Vortrag

Montag, 2. März 2009, 17:30–17:45, VMP 8 R05

Cryogenic trapping of keV ion beams at the CSR prototype — •Sebastian Menk¹, Klaus Blaum¹, Michael Froese¹, Manfred Grieser¹, Oded Heber², Michael Lange¹, Dimitry Orlov¹, Thomas Sieber¹, Michael Rappaport², Robert von Hahn¹, Jozef Varju¹, Andreas Wolf¹, and Daniel Zajfman² — ¹Max-Planck-Institut für Kernphysik, Saupfercheckweg 1,69117 Heidelberg — ²Weizmann Institut of Science, Rehovot, 76100, Israel

A Cryogenic Trap for Fast ion beams (CTF) was built to explore cooling techniques and test thermal decoupling of ion optics for the development of the electrostatic Cryogenic Storage Ring (CSR). These challenging projects will lead to a new experimental field of atomic and molecular physics with keV ion beams. The cold conditions of 2-10 K minimize the blackbody radiation field and are expected to lead to extremely low restgas densities (equivalent pressure at room temperature ≈10⁻¹³ mbar) which result in long storage lifetimes and for molecular ions to radiative cooling to their ro-vibrational ground states.
The CTF consists of two stacks of electrostatic mirror electrodes allowing the storage of up to 20 keV ion beams. Cryogenic ion beam storage has been realized with this device using a liquid helium refrigeration system to cool down the experimental trapping area to few-Kelvin cryogenic temperatures and experiments with cryogenically trapped molecular nitrogen ions have been performed to verify the low vacuum conditions by measuring their storage lifetimes.