IOP : Sympathetic cooling schemes for separately trapped ions coupled via image currents

Will, C.; Borchert, M.J.; Wiesinger, M.; Ospelkaus, C.; Mooser, A.; Matsuda, Y.; Devlin, J.A.; Fleck, M.; Driscoll, T.; Moller, R.; Smorra, C.; Abbass, F.; Quint, W.; Blaum, K.; Bohman, M.; Ulmer, S.; Walz, J.; Popper, D.; Latacz, B.; Wursten, E.; Erlewein, S.

doi:10.1088/1367-2630/ac55b3

Article
Report number	arXiv:2112.04818
Title	Sympathetic cooling schemes for separately trapped ions coupled via image currents
Author(s)	Will, C. (Heidelberg, Max Planck Inst.) ; Bohman, M. (Heidelberg, Max Planck Inst. ; Wako, RIKEN) ; Driscoll, T. (Texas U.) ; Wiesinger, M. (Heidelberg, Max Planck Inst. ; Wako, RIKEN) ; Abbass, F. (Mainz U., Inst. Phys.) ; Borchert, M.J. (Wako, RIKEN ; Leibniz U., Hannover ; Braunschweig, Phys. Tech. Bund.) ; Devlin, J.A. (Wako, RIKEN ; CERN) ; Erlewein, S. (Wako, RIKEN ; CERN) ; Fleck, M. (Wako, RIKEN ; Tokyo U.) ; Latacz, B. (Wako, RIKEN) ; Moller, R. (Mainz U., Inst. Phys.) ; Mooser, A. (Heidelberg, Max Planck Inst.) ; Popper, D. (Mainz U., Inst. Phys.) ; Wursten, E. (Heidelberg, Max Planck Inst. ; Wako, RIKEN ; CERN) ; Blaum, K. (Heidelberg, Max Planck Inst.) ; Matsuda, Y. (Tokyo U.) ; Ospelkaus, C. (Leibniz U., Hannover ; Braunschweig, Phys. Tech. Bund.) ; Quint, W. (Darmstadt, GSI) ; Walz, J. (Mainz U., Inst. Phys. ; Helmholtz Inst., Mainz) ; Smorra, C. (Wako, RIKEN ; Mainz U., Inst. Phys.) ; Ulmer, S. (Wako, RIKEN)
Publication	2022-03-17
Imprint	2021-12-09
Number of pages	19
In:	New J. Phys. 24 (2022) 033021
DOI	10.1088/1367-2630/ac55b3 (publication)
Subject category	nucl-ex ; Nuclear Physics - Experiment ; physics.atom-ph ; Other Fields of Physics
Abstract	Cooling of particles to mK-temperatures is essential for a variety of experiments with trapped charged particles. However, many species of interest lack suitable electronic transitions for direct laser cooling. We study theoretically the remote sympathetic cooling of a single proton with laser-cooled $^9$Be$^+$ in a double-Penning-trap system. We investigate three different cooling schemes and find, based on analytical calculations and numerical simulations, that two of them are capable of achieving proton temperatures of about 10 mK with cooling times on the order of 10 s. In contrast, established methods such as feedback-enhanced resistive cooling with image-current detectors are limited to about 1 K in 100 s. Since the studied techniques are applicable to any trapped charged particle and allow spatial separation between the target ion and the cooling species, they enable a variety of precision measurements based on trapped charged particles to be performed at improved sampling rates and with reduced systematic uncertainties.
Copyright/License	publication: © 2022-2025 The Author(s) (License: CC-BY-4.0) preprint: (License: CC BY 4.0)

$(a) Simplified schematic of a cylindrical Penning trap. The axial motion of the ion induces image currents in the trap electrodes, which are detected by means of a resonant circuit with high quality factor. (b) Simulated axial frequency data for low and high modified cyclotron temperatures using the model described in the text. The blue lines indicate the axial frequency without fluctuations from modified cyclotron transitions. A spin flip corresponding to a $\approx 170$\,mHz frequency shift occurs at simulation number 20 and 80. The spin flip is easily resolved at a low modified cyclotron temperature. In contrast, at high $T_+$ the superimposed fluctuations prevent an unambiguous identification of a spin flip. The last magnetic moment measurement of the proton \cite{Sch17} used $T_\text{thresh} = 600$\,mK.$ $(a) Simplified schematic of a cylindrical Penning trap. The axial motion of the ion induces image currents in the trap electrodes, which are detected by means of a resonant circuit with high quality factor. (b) Simulated axial frequency data for low and high modified cyclotron temperatures using the model described in the text. The blue lines indicate the axial frequency without fluctuations from modified cyclotron transitions. A spin flip corresponding to a $\approx 170$\,mHz frequency shift occurs at simulation number 20 and 80. The spin flip is easily resolved at a low modified cyclotron temperature. In contrast, at high $T_+$ the superimposed fluctuations prevent an unambiguous identification of a spin flip. The last magnetic moment measurement of the proton \cite{Sch17} used $T_\text{thresh} = 600$\,mK.$ $(a) Sketch of the experimental setup for the common-endcap coupling. The common endcap electrode can be modelled as a ideal capacitor. (b) Sketch of the experimental setup for the common-resonator coupling. The proton and \Be{} ions are stored in two independent traps which share a common resonator.$ Show more plots

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Záznam vytvorený 2022-04-07, zmenený 2025-01-09

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