scholarly journals Electro-Optical Ion Trap for Experiments with Atom-Ion Quantum Hybrid Systems

2020 ◽  
Vol 10 (7) ◽  
pp. 2222 ◽  
Author(s):  
Elia Perego ◽  
Lucia Duca ◽  
Carlo Sias
Keyword(s):  
Hybrid Systems ◽  
Optical Lattice ◽  
Ion Trap ◽  
Optical Trap ◽  
Paul Trap ◽  
Electric Quadrupole ◽  
Ion Traps ◽  
Ion Trapping ◽  
Ion Collisions ◽  
Ion Interactions

In the development of atomic, molecular, and optical (AMO) physics, atom-ion hybrid systems are characterized by the presence of a new tool in the experimental AMO toolbox: atom-ion interactions. One of the main limitations in state-of-the-art atom-ion experiments is represented by the micromotion component of the ions’ dynamics in a Paul trap, as the presence of micromotion in atom-ion collisions results in a heating mechanism that prevents atom-ion mixtures from undergoing a coherent evolution. Here, we report the design and the simulation of a novel ion trapping setup especially conceived of for integration with an ultracold atoms experiment. The ion confinement is realized by using an electro-optical trap based on the combination of an optical and an electrostatic field, so that no micromotion component will be present in the ions’ dynamics. The confining optical field is generated by a deep optical lattice created at the crossing of a bow-tie cavity, while a static electric quadrupole ensures the ions’ confinement in the plane orthogonal to the optical lattice. The setup is also equipped with a Paul trap for cooling the ions produced by photoionization of a hot atomic beam, and the design of the two ion traps facilitates the swapping of the ions from the Paul trap to the electro-optical trap.

The rotating-saddle trap: a mechanical analogy to RF-electric-quadrupole ion trapping?

2002 ◽  
Vol 80 (12) ◽  
pp. 1433-1448 ◽  
Author(s):  
R I Thompson ◽  
T J Harmon ◽  
M G Ball
Keyword(s):  
Ion Trap ◽  
Paul Trap ◽  
Electric Quadrupole ◽  
Quadrupole Ion Trap ◽  
Ion Trapping ◽  
University Of Calgary ◽  
Mechanical Analogue ◽  
Technical Details ◽  
The University ◽  
Excellent Tool

The rotating-saddle potential ball-bearing trap has long been used as a mechanical analogue to explain the operating principles of the Paul-type RF-electric-quadrupole ion trap. This paper outlines the shortcomings of this analogy, as well as explaining how and why this system remains an excellent tool for explaining ion-trap operation. The basic theory of the operating principles of the rotating-saddle trap is provided, which, unlike the Paul Trap is analytically solvable in the friction-free regime. In addition, some extensions to this theory are presented to examine such effects as friction. These results are compared with the equivalent results for Paul-Trap theory, as well as to experimental results measured with a rotating-saddle trap constructed at the University of Calgary. The technical details of this trap, an excellent tool for either lecture demonstrations or teaching laboratory experiments, are also presented, as well as some comments on building such a trap. PACS Nos.: 45.50-j, 01.50Pa, 32.80Pj

scholarly journals Mass-selective removal of ions from Paul traps using parametric excitation

2020 ◽  
Vol 126 (11) ◽  
Author(s):  
Julian Schmidt ◽  
Daniel Hönig ◽  
Pascal Weckesser ◽  
Fabian Thielemann ◽  
Tobias Schaetz ◽  
...  
Keyword(s):  
Parametric Excitation ◽  
Ion Trap ◽  
Paul Trap ◽  
Electric Quadrupole ◽  
Linear Increase ◽  
Selective Removal ◽  
Ion Trapping ◽  
Secular Frequency ◽  
Quadrupole Field ◽  
Narrow Bandwidth

AbstractWe study a method for mass-selective removal of ions from a Paul trap by parametric excitation. This can be achieved by applying an oscillating electric quadrupole field at twice the secular frequency $$\omega _{\text {sec}}$$ ω sec using pairs of opposing electrodes. While excitation near the resonance with the secular frequency $$\omega _{\text {sec}}$$ ω sec only leads to a linear increase of the amplitude with excitation duration, parametric excitation near $$2\, \omega _{\text {sec}}$$ 2 ω sec results in an exponential increase of the amplitude. This enables efficient removal of ions from the trap with modest excitation voltages and narrow bandwidth, therefore, substantially reducing the disturbance of ions with other charge-to-mass ratios. We numerically study and compare the mass selectivity of the two methods. In addition, we experimentally show that the barium isotopes with 136 and 137 nucleons can be removed from small ion crystals and ejected out of the trap while keeping $$^{138}\text {Ba}^{+}$$ 138 Ba + ions Doppler cooled, corresponding to a mass selectivity of better than $$\Delta m / m = 1/138$$ Δ m / m = 1 / 138 . This method can be widely applied to ion trapping experiments without major modifications since it only requires modulating the potential of the ion trap.

scholarly journals Spatial Confinement of Microobjects in the Radiofrequency Ion Trap in a Viscous Medium-=SUP=-*-=/SUP=-

2020 ◽  
Vol 128 (8) ◽  
pp. 1202
Author(s):  
A.V. Romanova ◽  
I.A. Kosternoi ◽  
Y.V. Rozhdestvensky
Keyword(s):  
Ion Trap ◽  
Paul Trap ◽  
Normal Pressure ◽  
Ion Traps ◽  
Viscous Medium ◽  
Spatial Confinement ◽  
Zero Crossing ◽  
Lycopodium Clavatum ◽  
First Time ◽  
Nonlinear Nature

In the present article a spatial confinement of microobjects were explored in the radiofrequency Paul trap at normal pressure. Spores of Lycopodium Clavatum, 33 μm in diameter, and CdSe/ZnS (core/shell) quantum dots conglomerates with size of 2-7 μm were used as such microobjects. Zero-crossing orbits of these objects were observed for the first time what indicates the nonlinear nature of dynamics of these particles in localization area. Mathematical descriptions of particle dynamics in a viscous is presented. It is shown that friction value depends on the radius of microobjects and dynamic viscosity. Moreover, zero-crossing orbits of charged particles in the radiofrequency Paul trap were numerically simulated. A new method of comparative analysis of the morphology of microparticles is proposed. Keywords: ion traps, non-linear dynamic, mass-spectrometry, biological objects.

Numerical analysis of trajectories in a Cassinian ion trap of second order with trap door ion inlet

2021 ◽  
Vol 27 (1) ◽  
pp. 3-12
Author(s):  
Bjoern Raupers ◽  
Hana Medhat ◽  
Juergen Grotemeyer ◽  
Frank Gunzer
Keyword(s):  
Ion Trap ◽  
Ion Traps ◽  
Second Order ◽  
Resolving Power ◽  
Periodic Pattern ◽  
Ion Motion ◽  
Trap Door ◽  
Mass Resolving Power ◽  
Long Time ◽  
The Fourier Transform

Ion traps like the Orbitrap are well known mass analyzers with very high resolving power. This resolving power is achieved with help of ions orbiting around an inner electrode for long time, in general up to a few seconds, since the mass signal is obtained by calculating the Fourier Transform of the induced signal caused by the ion motion. A similar principle is applied in the Cassinian Ion Trap of second order, where the ions move in a periodic pattern in-between two inner electrodes. The Cassinian ion trap has the potential to offer mass resolving power comparable to the Orbitrap with advantages regarding the experimental implementation. In this paper we have investigated the details of the ion motion analyzing experimental data and the results of different numerical methods, with focus on increasing the resolving power by increasing the oscillation frequency for ions in a high field ion trap. In this context the influence of the trap door, a tunnel through which the ions are injected into the trap, on the ion velocity becomes especially important.

Measurement of the effective electric field radius on Digital ion trap spectrometer

The Analyst ◽  
2021 ◽  
Author(s):  
Fuxing Xu ◽  
Weimin Wang ◽  
Bingjun Qian ◽  
Liuyu Jin ◽  
Chuanfan Ding
Keyword(s):  
Electric Field ◽  
Signal Intensity ◽  
Ion Trap ◽  
Great Influence ◽  
Mass Range ◽  
Ion Trapping ◽  
Fundamental Parameter ◽  
Digital Ion Trap ◽  
Effective Electric Field

The effective electric field radius is a fundamental parameter of ion trap which has great influence on ion trapping capability, signal intensity, mass range and some other properties of ion...

Studies of Ion Collisions in Ion Traps

1988 ◽  
Vol T22 ◽  
pp. 164-170 ◽  
Author(s):  
D A Church
Keyword(s):  
Ion Traps ◽  
Ion Collisions

How far can ion trap miniaturization go? Parameter scaling and space-charge limits for very small cylindrical ion traps

2014 ◽  
Vol 49 (3) ◽  
pp. 233-240 ◽  
Author(s):  
Yuan Tian ◽  
Jessica Higgs ◽  
Ailin Li ◽  
Brandon Barney ◽  
Daniel E. Austin
Keyword(s):  
Space Charge ◽  
Ion Trap ◽  
Ion Traps ◽  
Cylindrical Ion Traps

Ion-Neutral Collision Effects on Ion Trapping and Pseudopotential Depth in Ion Trap Mass Spectrometry

2019 ◽  
Vol 30 (12) ◽  
pp. 2750-2755 ◽  
Author(s):  
Ming Li ◽  
Xinwei Liu ◽  
Xiaoyu Zhou ◽  
Zheng Ouyang
Keyword(s):  
Mass Spectrometry ◽  
Ion Trap ◽  
Ion Trapping ◽  
Ion Trap Mass Spectrometry

Ion Motion Stability Diagram for Distorted Square Waveform Trapping Voltage

2002 ◽  
Vol 8 (3) ◽  
pp. 191-199 ◽  
Author(s):  
M. Sudakov ◽  
E. Nikolaev
Keyword(s):  
Ion Trap ◽  
Stability Diagram ◽  
Ion Trapping ◽  
Stable Region ◽  
Ion Motion ◽  
Motion Stability ◽  
Stability Diagrams ◽  
Duty Cycles ◽  
The Matrix ◽  
Considerable Length

Ion motion in a periodic radio frequency (RF) quadrupole electric field is analysed theoretically by the matrix method and direct trajectory calculation. General properties of the ion motion: stability condition, oscillation spectrum and secular frequency are derived analytically from the elements of the transformation matrix. Stability diagrams for ion motion in the Paul ion trap are presented for rectangular waveforms with different duty cycles (duration of pulse over period). Calculation of the secular frequencies of the ion motion in the ion trap is performed for the first time. The relation of radial and axial secular frequencies along the RF scan line was found to be practically identical in both the square waveform and harmonic voltage cases. Pulse shape distortions, due to resistive-inductive-capacitive filtering in real devices, are considered. Stability diagrams of ion motion in the ion trap with distorted voltage waveforms are calculated. Distortion of the waveform is shown to introduce minor changes in the diagram shape with respect to the diagram for an ideal square wave. Within the first stable region, distortion of the waveform does not lead to any auxiliary parametric resonances of the ion motion. Ion trapping with a pure random pulsed voltage is investigated by means of direct trajectory simulations. It is shown that, in this case, the ion motion can be conditionally stable for a considerable length of time.

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