Doppler and sympathetic cooling for the investigation of short-lived radioactive ions

At radioactive ion beam (RIB) facilities, ions of short-lived radionuclides are cooled and bunched in buffer-gas-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 O2+ 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.

Maier, F. M. (författare)
Au, M. (författare)
Fischer, P. (författare)
Kanitz, C. (författare)
Lagaki, V. (författare)
Lechner, S. (författare)
Leistenschneider, E. (författare)
Leimbach, David,1992Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)(Swepub:gu)xleida (författare)
Lykiardopoulou, E. M. (författare)
Kwiatkowski, A. A. (författare)
Manovitz, T. (författare)
Vila Gracia, Y. N. (författare)
Neyens, G. (författare)
Plattner, P. (författare)
Rothe, S. (författare)
Schweikhard, L. (författare)
Vilen, M. (författare)
Wolf, R. N. (författare)
Malbrunot-Ettenauer, S. (författare)
Göteborgs universitetInstitutionen för fysik (GU) (creator_code:org_t)

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