SAMOP 2023 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 2: Multi-Reflection Time-of-Flight Spectrometers
MS 2.3: Vortrag
Mittwoch, 8. März 2023, 11:30–11:45, F128
Ion beam purification with the PUMA multi-reflection time-of-flight mass spectrometer — •Moritz Schlaich1, Alexandre Obertelli1, Frank Wienholtz1, and Clara Klink1,2 — 1Institut für Kernphysik, TU Darmstadt, Darmstadt, Deutschland — 2CERN, Genf, Schweiz
Using low-energy antiprotons provided by the Extra Low Energy Antiproton ring (ELENA) at CERN, the antiProton Unstable Matter Annihilation (PUMA) experiment aims to probe the isospin composition in the density tail of radioactive nuclei. For this purpose, PUMA intends to trap one billion antiprotons at ELENA in a portable Penning trap and transport them to the Isotope mass Separator On-Line DEvice (ISOLDE) at CERN. By analyzing the annihilation reactions of antiprotons with radioactive nuclei, the experiment plans to study neutron skin formation of neutron-rich nuclei and halo nuclei.
Reference measurements and the investigation of the neutron skin evolution along isotopic chains of stable nuclei (e.g. Ca, Sn or Xe) preceding the application to radioactive nuclei require a versatile offline ion source setup. In addition to a linear Paul trap used for ion cooling and accumulation, it includes a multi-reflection time-of-flight mass spectrometer (MR-ToF MS) for ion beam purification. By using electrostatic fields only, the MR-ToF MS can prolong the ion flight path by up to three orders of magnitude. This allows ion ejection with a mass resolving power up to 105, thus separating only the mass-over-charge value of interest. The talk will provide an overview of the experimental setup as well as first results of ion beam purification experiments.