Speaker
Description
Low energy branches of radioactive Ion Beam (RIB) facilities and experiments are faced with an ever increasing need to deliver high-quality ion beams and use them more efficiently. Experiments are commonly limited by isobaric contamination, resulting in decreased signal-to-noise ratios, systematic uncertainties caused by impure ion samples, or the need to process ever larger quantities of ions to reach more exotic isotope species of interest. This challenge is shared by various research activities at RIB facilities across different fields, such as nuclear physics, solid state physics, and medical isotope production.
A novel Multi-Reflection Time-of-Flight (MR-ToF) Mass Spectrometer operating at an unprecedented ion beam energy of 30 keV is currently being built at MIRACLS [1,2] to address these challenges. The new system will serve both as an advanced beam purification apparatus and a high-sensitivity, high-resolution Collinear Laser Spectroscopy (CLS) experiment. The extended ion sample observation time, gained by trapping and repeatedly probing a bunched ion beam, will enable CLS measurements with a significant boost in experimental sensitivity. For closed two-level systems such as even-even Mg or Cd isotopes, for instance, the improvement factor in sensitivity compared to conventional florescence-based CLS is estimated to be 30-700, depending on half-life, mass and spectroscopic transition of the ions of interest. The 30-keV MR-ToF device will in a later phase serve as a first-generation `high-energy' advanced beam purification apparatus at ISOLDE, capable of delivering isobarically purified ion samples to downstream experiments, such as PUMA [3].
In this contribution the MIRACLS system and its application to CLS measurements and ion beam purification are presented, as well as the synergies between these aspects and the integration of the device into ISOLDE.
References
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Ettenauer. First steps in the development of the Multi Ion Reflection Apparatus for Collinear
Laser Spectroscopy. Nuclear Instruments and Methods in Physics Research Section B:
Beam Interactions with Materials and Atoms, 463:310–314, 2020.
[2] V. Lagaki, H. Heylen, I. Belosevic, P. Fischer, C. Kanitz, S. Lechner, F.M. Maier,
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apparatus: Conventional, single-passage collinear laser spectroscopy inside a MR-ToF de-
vice. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spec-
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[3] J. Carbonell, A. Corsi, F. Flavigny, H. De Gersem, G. Hupin, Y. Kubota, R. Lazauskas,
S. Malbrunot, N. Marsic, W. F. O. Muller, S. Naimi, N. Nakatsuka, A.Obertelli, N. Paul,
P. Perez, E.C. Pollacco, M. Rosenbusch, R. Seki, T. Uesaka, and F. Wienholtz. PUMA:
antiprotons and radioactive nuclei. Unpublished, EUROPEAN ORGANIZATION FOR
NUCLEAR RESEARCH: Memorandum to the ISOLDE and Neutron Time-of-Flight Com-
mittee, 2018.
