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MS: Fachverband Massenspektrometrie
MS 9: Ion Storage Rings
MS 9.1: Invited Talk
Thursday, March 17, 2022, 14:00–14:30, MS-H9
Isochronous mass spectrometry and beam purification in an electrostatic storage ring — •Viviane C. Schmidt — Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
Electrostatic storage rings have been primarily used for collision studies of charged atoms or molecules with photons, atoms, and electrons until now. Due to the electrostatic nature and therefore mass-independent storage of the devices, multiple ion species can be stored simultaneously. The identification and removal of these predominantly isobaric contaminations from the beam is not obvious. So far, electrostatic storage rings mostly rely on identification and purification methods prior to injection for contaminant-free measurements. Here, we report the first successful isochronous operation of an electrostatic storage ring achieved at the Cryogenic Storage Ring (CSR) facility at the Max-Planck-Institut für Kernphysik in Heidelberg (von Hahn et al., Rev. Sci. Instrum. 87, 2016). The isochronous operation enables a sensitive, mass based identification of the stored beam components, information vital for all experiments conducted at CSR. Uncooled beams with typical momentum spreads of 10−3 and emittance of a few mm·mrad were investigated at non-relativistic beam energies of a few hundred keV. Mass resolutions of Δ m/m<10−5 could be reached and isobaric contaminations below relative beam fractions of 10−4 could be identified. The proof-of-principle measurements presented here open up a new field of application in the form of ion mass measurements for these devices. Furthermore, beam purification methods to remove the identified contaminations inside the ring have been developed.