SAMOP 2021 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 4: Storage Rings
MS 4.3: Vortrag
Freitag, 24. September 2021, 14:45–15:00, H2
First isochronous mass spectrometry in an electrostatic storage ring — •Viviane C. Schmidt1, Manfred Grieser1, Klaus Blaum1, Ábel Kálosi1,2, Holger Kreckel1, Damian Müll1, Oldřich Novotný1, Felix Nuesslein1, and Andreas Wolf1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2Columbia Astrophysics Laboratory, Columbia University, New York, 10027 New York, USA
In magnetic storage rings isochronous mass spectrometry is a vital tool for radionuclei mass measurements. These experiments require relativistic beam energies and low beam emittance and momentum spread, reachable only by means of additional phase-space cooling. Here, we report the first isochronous operation of an electrostatic storage ring, achieved at the Cryogenic Storage Ring facility at the Max-Planck-Institut für Kernphysik in Heidelberg. At non-relativistic energies of a few hundred keV and using beams with typical momentum spreads of 10−3 and emittance of a few mm·mrad high resolution measurements were performed without the need of phase space cooling. Mass resolutions of Δ m/m<10−5 could be reached and isobaric contaminations well below relative beam fractions of 10−4 could be identified at A ∼ 20 u. Both the time-of-flight method and revolution frequency measurements using a Shottky pick-up were successfully employed. Due to the purely electrostatic storage, this method furthermore has the distinct advantage over magnetic storage rings of providing a nearly unlimited mass operation range, enabling measurements from small atoms to complex molecule and cluster systems.