| Article | |
| Title | Doppler and sympathetic cooling for the investigation of short-lived radioactive ions |
| Author(s) | Sels, S (CERN ; Leuven U.) ; Maier, F M (CERN ; Greifswald U.) ; Au, M (CERN ; Mainz U.) ; Fischer, P (Greifswald U.) ; Kanitz, C (CERN) ; Lagaki, V (CERN ; Greifswald U.) ; Lechner, S (CERN ; TU Vienna) ; Leistenschneider, E (CERN) ; Leimbach, D (CERN ; Mainz U., Inst. Phys. ; U. Gothenburg (main)) ; Lykiardopoulou, E M (British Columbia U. ; TRIUMF) ; Kwiatkowski, A A (TRIUMF) ; Manovitz, T (Weizmann Inst.) ; Vila Gracia, Y N (CERN) ; Neyens, G (CERN ; Leuven U.) ; Plattner, P (CERN ; Innsbruck U.) ; Rothe, S (CERN) ; Schweikhard, L (Greifswald U.) ; Vilen, M (CERN) ; Wolf, R N (U. Sydney (main)) ; Malbrunot-Ettenauer, S (cern) |
| Publication | 2022 |
| Number of pages | 19 |
| In: | Phys. Rev. Res. 4 (2022) 033229 |
| DOI | 10.1103/PhysRevResearch.4.033229 (publication) |
| Subject category | Accelerators and Storage Rings |
| Abstract | At radioactive ion beam (RIB) facilities, ions of short-lived radionuclides are cooled and bunched in buffergas-filled Paul traps to improve the ion-beam quality for subsequent experiments. To deliver even colder ions, beneficial to RIB experiments’ sensitivity or accuracy, we employ Doppler and sympathetic cooling in a Paul trap cooler-buncher. The improved emittance of Mg$^+$, K$^+$, and O$^+_2$ ion beams is demonstrated by a reduced time-of-flight spread of the extracted ion bunches with respect to room-temperature buffer-gas cooling. Cooling externally-produced hot ions with energies of at least 7 eV down to a few Kelvin is achieved in a timescale of $O$(100 ms) by combining a low-pressure helium background gas with laser cooling. This is sufficiently short to cool short-lived radioactive ions. As an example of this technique’s use for RIB research, the mass-resolving power in a multireflection time-of-flight mass spectrometer is shown to increase by up to a factor of 4.6 with respect to buffer-gas cooling. Simulations show good agreement with the experimental results and guide further improvements and applications. These results open a path to a significant emittance improvement and, thus, unprecedented ion-beam qualities at RIB facilities, achievable with standard equipment readily available. The same method provides opportunities for future high-precision experiments with radioactive cold trapped ions. |
| Copyright/License | publication: © 2022-2025 authors (License: CC-BY-4.0) |
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