SAMOP 2023 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 7: Poster

MS 7.9: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

ISOLTRAP’s new Mini-RFQ buncher for beam purification — •Daniel Lange on behalf of the ISOLTRAP collaboration — Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany

High-precision mass measurements of radioactive ions are used to determine nuclear binding energies, which reflect all forces in the nucleus and are used to study among others nuclear structure, nuclear astrophysics and weak interaction. Far away from stability, production cross-sections drop and beams are contaminated with isobars and molecules, impeding precision measurements.

For this, the ISOLTRAP mass spectrometer at ISOLDE/CERN [1] uses various ion traps, including a tandem Penning-trap system and multi-reflection time-of-flight mass spectrometer (MR-ToF MS). The latter is suitable of both mass separation and fast, precise mass measurements. These two different modes of operation can be used in succession to enable measurements of extremely contaminated beams when a re-trapping system is used [2].

The new Mini-RFQ behind the MR-ToF MS should not only recapture the ions of interest, but also re-bunch them. Additionally, a cryogenic approach is pursued to further improve the precision of the mass measurement with the MR-ToF MS. The current setup of the ISOLTRAP experiment is presented together with the future re-bunching design. For this purpose, the experimental test-setup with initial simulations will be outlined in more detail.

[1] Lunney D. et al., J. Phys. G: Nucl. Part. Phys. 44 (2017) 064008

[2] Dickel T. et al., J. Am. Soc. Mass Spectrom., 28 (6) (2017)