Deceleration, precooling, and multi-pass stopping of highly charged ions in Be<sup>+</sup> Coulomb crystals

Schmöger, Lisa; Schwarz, Maria A.; Baumann, T.; Versolato, Oscar; Piest, Baptist; Pfeifer, Thomas; Ullrich, J.; Schmidt, Piet O.; López‐Urrutia, J. R. Crespo

doi:10.1063/1.4934245

Cited by 30 publications

(27 citation statements)

References 43 publications

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“…Likewise ions in rf traps (28), and more recently Penning traps (29), are routinely prepared in the ground state. Similarly, sympathetic cooling, in which a laser cooled ion couples via the Coulomb interaction to another ion without a suitable cooling transition, has been demonstrated for a variety of ions (30)(31)(32) and implemented for modern metrology and spectroscopy experiments (33).…”

Section: Sympathetic Coolingmentioning

confidence: 99%

Sympathetic cooling of protons and antiprotons with a common endcap Penning trap

Bohman

Mooser²,

Schneider

et al. 2017

Journal of Modern Optics

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We present an experiment to sympathetically cool single protons and antiprotons in a Penning trap by resonantly coupling the particles to laser cooled beryllium ions using a common endcap technique. Our analysis shows that preparation of (anti)protons at mK temperatures on timescales of tens of seconds is feasible. Successful implementation of the technique will have immediate and significant impact on high-precision comparisons of the fundamental properties of protons and antiprotons. This in turn will provide stringent tests of the fundamental symmetries of the Standard Model. ARTICLE HISTORY

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Section: Sympathetic Coolingmentioning

confidence: 99%

Sympathetic cooling of protons and antiprotons with a common endcap Penning trap

Bohman

Mooser²,

Schneider

et al. 2017

Journal of Modern Optics

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“…Five segmented einzel lenses53 and an electrostatic double-focusing 90° deflector 54 are employed for focusing and steering. A pair of pulsed drift tubes (following the approach described in ref 33. ) is used for deceleration and pre-cooling, reducing the phase-space volume of the bunches.…”

mentioning

confidence: 99%

Coherent laser spectroscopy of highly charged ions using quantum logic

Micke

Leopold

King

et al. 2020

Nature

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134

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Precision spectroscopy of atomic systems 1 is an invaluable tool for the advancement of our understanding of fundamental interactions and symmetries 2. Recently, highly charged ions (HCI) have been proposed for sensitive tests of physics beyond the Standard Model 2-5 and as candidates for high-accuracy atomic clocks 3,5. However, the implementation of these ideas has been hindered by the parts-per-million level spectroscopic accuracies achieved to date 6-8. Here, we cool a trapped HCI to the lowest reported temperatures, and introduce coherent laser spectroscopy on HCI with an eight orders of magnitude leap in precision. We probe the forbidden optical transition in 40 Ar 13+ at 441 nm using quantum-logic spectroscopy 9,10 and measure both its excited-state lifetime and g-factor. Our work ultimately unlocks the potential of HCI, a large, ubiquitous atomic class, for quantum information processing, novel frequency standards, and highly sensitive tests of fundamental physics, such as searching for dark matter candidates 11 or violations of fundamental symmetries 2. Alike a microscope aimed at the quantum world, laser spectroscopy pursues ever higher resolving power. Every increase in resolution enables deeper insights into the subtle effects that all known fundamental interactions have on the atomic wave function. Advances in optical frequency metrology have dramatically improved resolution in the last three decades 1 , and are making laser spectroscopy an extremely sensitive tool for studying open physics questions such as the nature of dark matter, the strength of parity violation, or a possible violation of Einstein's theory of relativity 2. However, only a few atomic and ionic species are currently within the reach of cutting-edge optical frequency metrology. Expanding this field of exploration to systems with high sensitivity to such effects is therefore crucial. Due to their extreme properties, highly charged ions (HCI) are promising candidates for such fundamental tests. Contributions from special

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“…Since the available number of HCI is small, various techniques have been proposed in order to optimize the yield of HCI at the delivery point, e.g., mixing HCI with cold electrons (Beier et al, 2005;Kluge et al, 2008;Poth et al, 1991;Quint et al, 2001) or evaporative cooling from a bunch of HCI oscillating inside a Penning trap (Hobein et al, 2011). One method successfully applied to HCI is pulsed extraction from an EBIT followed by phase-space cooling of the formed ion bunch by application of a time and position dependent sudden electric pulse (Schmöger et al, 2015a) to the moving HCI bunch. After the pulse, more kinetic energy is removed from the faster ions than the slower ones, and an additional time-focusing effect can be conveniently achieved.…”

Section: Techniques For Hci Deliverymentioning

confidence: 99%

Highly charged ions: Optical clocks and applications in fundamental physics

et al. 2018

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Recent developments in frequency metrology and optical clocks have been based on electronic transitions in atoms and singly charged ions as references. The control over all relevant degrees of freedom in these atoms has enabled relative frequency uncertainties at a level of a few parts in 10 −18 . This accomplishment not only allows for extremely accurate time and frequency measurements, but also to probe our understanding of fundamental physics, such as a possible variation of fundamental constants, a violation of the local Lorentz invariance, and the existence of forces beyond the Standard Model of Physics. In addition, novel clocks are driving the development of sophisticated technical applications. Crucial for applications of clocks in fundamental physics are a high sensitivity to effects beyond the Standard Model and Einstein's Theory of Relativity and a small frequency uncertainty of the clock. Highly charged ions offer both. They have been proposed as highly accurate clocks, since they possess optical transitions which can be extremely narrow and less sensitive to external perturbations compared to current atomic clock species. The large selection of highly charged ions in different charge states offers narrow transitions that are among the most sensitive ones for a change in the finestructure constant and the electron-to-proton mass ratio, as well as other new physics effects. Recent experimental advances in trapping and sympathetic cooling of highly charged ions will in the future enable advanced quantum logic techniques for controlling motional and internal degrees of freedom and thus enable high accuracy optical spectroscopy. Theoretical progress in calculating the properties of selected highly charged ions has allowed the evaluation of systematic shifts and the prediction of the sensitivity to the "new physics" effects. New theoretical challenges and opportunities emerge from relativistic, quantum electrodynamics, and nuclear size contributions that become comparable with interelectronic correlations. This article reviews the current status of theory and experiment in the field, addresses specific electronic configurations and systems which show the most promising properties for research, their potential limitations, and the techniques for their study.

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Deceleration, precooling, and multi-pass stopping of highly charged ions in Be⁺ Coulomb crystals

Cited by 30 publications

References 43 publications

Sympathetic cooling of protons and antiprotons with a common endcap Penning trap

Sympathetic cooling of protons and antiprotons with a common endcap Penning trap

Coherent laser spectroscopy of highly charged ions using quantum logic

Highly charged ions: Optical clocks and applications in fundamental physics

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Deceleration, precooling, and multi-pass stopping of highly charged ions in Be+ Coulomb crystals

Cited by 30 publications

References 43 publications

Sympathetic cooling of protons and antiprotons with a common endcap Penning trap

Sympathetic cooling of protons and antiprotons with a common endcap Penning trap

Coherent laser spectroscopy of highly charged ions using quantum logic

Highly charged ions: Optical clocks and applications in fundamental physics

Contact Info

Product

Resources

About

Deceleration, precooling, and multi-pass stopping of highly charged ions in Be⁺ Coulomb crystals