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Article

Investigations on Dynamical Stability in 3D Quadrupole Ion Traps

1
National Institute for Laser, Plasma and Radiation Physics (INFLPR), Atomiştilor Str. Nr. 409, 077125 Măgurele, Romania
2
Department of Computing and Mathematics, Manchester Metropolitan University, Manchester M1 5GD, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Pablo Padilla de la Torre
Appl. Sci. 2021, 11(7), 2938; https://doi.org/10.3390/app11072938
Received: 26 February 2021 / Revised: 18 March 2021 / Accepted: 22 March 2021 / Published: 25 March 2021
(This article belongs to the Section Applied Physics)
We firstly discuss classical stability for a dynamical system of two ions levitated in a 3D Radio-Frequency (RF) trap, assimilated with two coupled oscillators. We obtain the solutions of the coupled system of equations that characterizes the associated dynamics. In addition, we supply the modes of oscillation and demonstrate the weak coupling condition is inappropriate in practice, while for collective modes of motion (and strong coupling) only a peak of the mass can be detected. Phase portraits and power spectra are employed to illustrate how the trajectory executes quasiperiodic motion on the surface of torus, namely a Kolmogorov–Arnold–Moser (KAM) torus. In an attempt to better describe dynamical stability of the system, we introduce a model that characterizes dynamical stability and the critical points based on the Hessian matrix approach. The model is then applied to investigate quantum dynamics for many-body systems consisting of identical ions, levitated in 2D and 3D ion traps. Finally, the same model is applied to the case of a combined 3D Quadrupole Ion Trap (QIT) with axial symmetry, for which we obtain the associated Hamilton function. The ion distribution can be described by means of numerical modeling, based on the Hamilton function we assign to the system. The approach we introduce is effective to infer the parameters of distinct types of traps by applying a unitary and coherent method, and especially for identifying equilibrium configurations, of large interest for ion crystals or quantum logic. View Full-Text
Keywords: radiofrequency trap; dynamical stability; eigenfrequency; Paul and Penning trap; Hessian matrix; Hamilton function; bifurcation diagram radiofrequency trap; dynamical stability; eigenfrequency; Paul and Penning trap; Hessian matrix; Hamilton function; bifurcation diagram
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MDPI and ACS Style

Mihalcea, B.M.; Lynch, S. Investigations on Dynamical Stability in 3D Quadrupole Ion Traps. Appl. Sci. 2021, 11, 2938. https://doi.org/10.3390/app11072938

AMA Style

Mihalcea BM, Lynch S. Investigations on Dynamical Stability in 3D Quadrupole Ion Traps. Applied Sciences. 2021; 11(7):2938. https://doi.org/10.3390/app11072938

Chicago/Turabian Style

Mihalcea, Bogdan M.; Lynch, Stephen. 2021. "Investigations on Dynamical Stability in 3D Quadrupole Ion Traps" Appl. Sci. 11, no. 7: 2938. https://doi.org/10.3390/app11072938

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