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DOE OSTI · 3413255

Design, simulation, and manufacturability of a micro-ion trap incorporating a 3D-printed loading zone for improved hot-ion capture

Patra, Sayan [Lawrence Livermore National Laboratory]·Parakh, Abhinav [Lawrence Livermore National Laboratory]·Xia, Xiaoxing [Lawrence Livermore National Laboratory]·Biener, Juergen [Lawrence Livermore National Laboratory]·Häffner, Hartmut [University of California Berkeley]·Beck, Kristi [Lawrence Livermore National Laboratory]
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Patra, Sayan [Lawrence Livermore National Laboratory], Parakh, Abhinav [Lawrence Livermore National Laboratory], Xia, Xiaoxing [Lawrence Livermore National Laboratory], Biener, Juergen [Lawrence Livermore National Laboratory], Häffner, Hartmut [University of California Berkeley], Beck, Kristi [Lawrence Livermore National Laboratory]. 2026-08-13. Design, simulation, and manufacturability of a micro-ion trap incorporating a 3D-printed loading zone for improved hot-ion capture. https://doi.org/10.1063/5.0343417

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DOE OSTI2026

Magnus method for electronic structure calculations at extreme conditions

We present the application of Magnus based methods to the solution of first order coupled ordinary differential equations in High Energy Density (HED) physics applications. Our focus is on the application to quantum mechanical methods, specifically on the solution of the radial Dirac equation for real and complex energies. HED applications require accurate solutions across a wide range of spatial and energy domains, including regimes where the solutions exhibit pronounced oscillatory behavior. Such cases pose significant computational challenges. We demonstrate that Magnus-based integrators can efficiently and accurately address these challenges. We discuss the implementation of the Magnus method for the solution of the radial Dirac equation, including practical considerations such as the evaluation of matrix exponentials, numerical integration, error estimation, and adaptive step size control. We also discuss the application of these methods to complex energy Green’s function techniques and the efficient approximation of integrals of the solutions relevant to HED electronic structure calculations. Here, we demonstrate the accuracy and robustness of the resulting method in applications to the free-particle case, for which analytic solutions are available for comparison, as well as the challenging case of gold at HED conditions.

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