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A: Fachverband Atomphysik
A 20: Precision spectroscopy of atoms and ions III
A 20.5: Vortrag
Mittwoch, 11. März 2020, 15:15–15:30, f303
Setup and characterization of a source of highly charged ions with reduced momentum spread — •Michael Karl Rosner1, Peter Micke1,2, Sandra Bogen1, Steffen Kühn1, Julian Stark1, Moto Togawa1, Christian Warnecke1, Sungnam Park3, Keisuke Fujii4, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland — 2Physikalisch-Technische Bundesanstalt, Braunschweig, Deutschland — 3Ulsan National Institute of Science and Technology, Ulsan, Korea — 4Department of Mechanical Engineering and Science, Kyoto University, Kyoto, Japan
Highly charged ions (HCI) exhibit strongly enhanced quantum-electrodynamic and nuclear size effects. In some HCI, the frequency of forbidden optical transitions is very sensitive to a possible variation of the fine-structure constant α. Electron beam ion traps (EBIT) can reliably produce HCI [1], but at temperatures too high for such frequency-metrology studies. For this, sympathetic cooling is applied to HCI in a radio-frequency trap [2], requiring also a beamline for HCI transfer, bunching, pre-cooling and deceleration. A new setup based on our earlier HC-EBIT [1] and beamline designs [3] has been built at MPIK. We characterize it with time-of-flight measurements of the HCI charge-state distribution, kinetic energy and momentum spread; the latter has been much reduced in our pre-cooling deceleration unit.
[1] P. Micke, et al., Rev. Sci. Instrum. 89, 063109 (2018)
[2] L. Schmöger, et al., Science 347, 1233 (2015)
[3] P. Micke, et. el., in preparation