Universal nonmonotonic structure in the saturation curves of magneto-optical-trap-loaded<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>Na</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>ions stored in an ion-neutral hybrid trap: Prediction and observation

Blümel, R.; Wells, James; Goodman, Douglas S.; Kwolek, Jonathan; Smith, William Hayden

doi:10.1103/physreva.92.063402

Cited by 3 publications

(11 citation statements)

References 27 publications

(55 reference statements)

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“…5, loading curves of the steady-state ion number as a function of loading rate λ are shown for three sets of rf parameters that each result in q = 0.3. In each case, both the monotonic rise in region I and the plateau of region II are visible, predicted and previously observed in [21]. Since q is kept constant in all three cases shown in Fig.…”

Section: Resultssupporting

confidence: 80%

Section: Simulationsmentioning

confidence: 74%

“…Model simulations have already been done [21] that confirm the existence of the four different dynamical regimes. In addition it was shown in [21] that the phenomenon is robust with respect to the statistical distribution of time between loading events, temperature, loading mechanisms, and the geometry of the absorbing boundary. So here the emphasis is not so much on proving the existence of the four dynamical regions, or their robustness, but to see whether the simulations can qualitatively, and to some extent quantitatively, describe the experimentally observed characteristics of regions I and II.…”

Section: Simulationsmentioning

confidence: 74%

“…Since independence of the loading statistics has already been demonstrated in [21], we focus in this paper on the case of uniform loading statistics. Qualitatively, our results stay valid, which we checked explicitly, if different loading statistics, such as Gaussian statistics, are used.…”

Section: Simulationsmentioning

confidence: 99%

“…The loading of the Paul trap as a function of time was also examined. In our previous work [21], the loading as a function of time in region IV was determined from the…”

Section: B Region IImentioning

confidence: 99%

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Loading a linear Paul trap to saturation from a magneto-optical trap

et al. 2017

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We present experimental measurements of the steady-state ion number in a linear Paul trap (LPT) as a function of the ion-loading rate. These measurements, taken with (a) constant Paul trap stability parameter q, (b) constant radio-frequency (rf) amplitude, or (c) constant rf frequency, show nonlinear behavior. At the loading rates achieved in this experiment, a plot of the steady-state ion number as a function of loading rate has two regions: a monotonic rise (region I) followed by a plateau (region II). Also described are simulations and analytical theory which match the experimental results. Region I is caused by rf heating and is fundamentally due to the time dependence of the rf Paul-trap forces. We show that the time-independent pseudopotential, frequently used in the analytical investigation of trapping experiments, cannot explain region I, but explains the plateau in region II and can be used to predict the steady-state ion number in that region. An important feature of our experimental LPT is the existence of a radial cut-offRcut that limits the ion capacity of our LPT and features prominently in the analytical and numerical analysis of our LPT-loading results. We explain the dynamical origin ofRcut and relate it to the chaos border of the fractal of non-escaping trajectories in our LPT. We also present an improved model of LPT ion-loading as a function of time.

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Section: Resultssupporting

confidence: 80%

Section: Simulationsmentioning

confidence: 74%

Section: Simulationsmentioning

confidence: 74%

Section: Simulationsmentioning

confidence: 99%

“…The loading of the Paul trap as a function of time was also examined. In our previous work [21], the loading as a function of time in region IV was determined from the…”

Section: B Region IImentioning

confidence: 99%

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Loading a linear Paul trap to saturation from a magneto-optical trap

et al. 2017

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Cold hybrid ion-atom systems

et al. 2019

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Hybrid systems of laser-cooled trapped ions and ultracold atoms combined in a single experimental setup have recently emerged as a new platform for fundamental research in quantum physics. This paper reviews the theoretical and experimental progress in research on cold hybrid ion-atom systems which aim to combine the best features of the two well-established fields. We provide a broad overview of the theoretical description of ion-atom mixtures and their applications, and report on advances in experiments with ions trapped in Paul or dipole traps overlapped with a cloud of cold atoms, and with ions directly produced in a Bose-Einstein condensate. We start with microscopic models describing the electronic structure, interactions, and collisional physics of ion-atom systems at low and ultralow temperatures, including radiative and non-radiative charge transfer processes and their control with magnetically tunable Feshbach resonances. Then we describe the relevant experimental techniques and the intrinsic properties of hybrid systems. In particular, we discuss the impact of the micromotion of ions in Paul traps on ion-atom hybrid systems. Next, we review recent proposals for using ions immersed in ultracold gases for studying cold collisions, chemistry, many-body physics, quantum simulation, and quantum computation and their experimental realizations. In the last part we focus on the formation of molecular ions via spontaneous radiative association, photoassociation, magnetoassociation, and sympathetic cooling. We discuss applications and prospects of cold molecular ions for cold controlled chemistry and precision spectroscopy.

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Loading a Paul Trap: Densities, Capacities, and Scaling in the Saturation Regime

Blümel

2021

Atoms

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Providing ideal conditions for the study of ion-neutral collisions, we investigate here the properties of the saturated, steady state of a three-dimensional Paul trap, loaded from a magneto-optic trap. In particular, we study three assumptions that are sometimes made under saturated, steady-state conditions: (i) The pseudopotential provides a good approximation for the number, Ns, of ions in the saturation regime, (ii) the maximum of Ns occurs at a loading rate of approximately 1 ion per rf cycle, and (iii) the ion density is approximately constant. We find that none of these assumptions are generally valid. However, based on detailed classical molecular dynamics simulations, and as a function of loading rate and trap control parameter, we show where to find convenient dynamical regimes for ion-neutral collision experiments, or how to rescale to the pseudo-potential predictions. We also investigate the fate of the electrons generated during the loading process and present a new heating mechanism, insertion heating, that in some regimes of trapping and loading may rival and even exceed the rf-heating power of the trap.

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Universal nonmonotonic structure in the saturation curves of magneto-optical-trap-loadedNa+ions stored in an ion-neutral hybrid trap: Prediction and observation

Cited by 3 publications

References 27 publications

Loading a linear Paul trap to saturation from a magneto-optical trap

Loading a linear Paul trap to saturation from a magneto-optical trap

Cold hybrid ion-atom systems

Loading a Paul Trap: Densities, Capacities, and Scaling in the Saturation Regime

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