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Treating Surfaces with a Cold Atmospheric Pressure Plasma using the COST-Jet

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Published on: November 2, 2020

Sculpted ultracold neutral plasmas.

Vikram S Dharodi¹, Michael S Murillo¹

¹Department of Computational Mathematics, Science, and Engineering, Michigan State University, East Lansing, Michigan 48824, USA.

Physical Review. E

|March 15, 2020

Summary

Ultracold neutral plasmas (UNPs) offer tunable conditions for studying complex phenomena. Simulations show sculpted UNPs can explore diverse regimes from fluid to kinetic, enabling research into waves, transport, and instabilities.

Area of Science:

Plasma Physics
Computational Physics
Condensed Matter Physics

Background:

Ultracold neutral plasmas (UNPs) provide a unique experimental platform for investigating fundamental plasma physics.
Control over plasma properties, including Coulomb coupling, allows exploration of diverse physical regimes.
Heterogeneous and nonequilibrium phenomena in plasmas are challenging to study experimentally.

Purpose of the Study:

To investigate the potential of sculpted ultracold neutral plasmas (UNPs) for studying complex plasma phenomena.
To develop and utilize computational models for simulating UNPs with tailored properties.
To explore the range of kinetic and fluid behaviors achievable in sculpted UNPs.

Main Methods:

Molecular dynamics simulations were employed to model UNPs generated by spatially modulated ionizing radiation.

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A computational model incorporating spatiotemporal screening and Langevin collisions was developed.

A hydrodynamics model was derived from simulation data to analyze plasma kinetics and fluid properties.

Main Results:

Simulations demonstrated the creation of UNPs exhibiting a spectrum of behaviors, from near-perfect fluid (Euler limit) to highly kinetic states.
Three distinct geometries (solid rod, hollow rod, gapped slab) were analyzed, revealing control over the spatial Coulomb coupling parameter.
The study identified conditions for generating UNPs suitable for exploring phenomena like shock waves, blast waves, and instabilities.

Conclusions:

Sculpted UNPs are a versatile tool for studying diverse nonequilibrium plasma phenomena.
Computational models provide insights into tailoring UNP properties for specific research objectives.
Achieving high Coulomb couplings, potentially exceeding 10, is feasible, opening avenues for exploring strongly coupled plasma physics.