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Neeraj Chaubey

Publications and source records attributed to Neeraj Chaubey.

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DustNET: enabling machine learning and AI models of dusty plasmas

Dusty plasmas are ubiquitous throughout the universe, spanning laboratory and industrial plasmas, fusion devices, planetary environments, cometary comae, and interstellar media. Despite decades of research, many aspects of their behavior remain poorly understood within a unified framework. While numerous theoretical and numerical models describe specific phenomena, such as dust charging, transport, waves, and self-organization, fully predictive models across the wide range of spatial and temporal scales in both laboratory and natural systems remain elusive. Conventional plasma descriptions rely on coupled differential equations for particle densities, momenta, and energies, but their solutions are often limited by computational cost, numerical uncertainties, and incomplete knowledge of boundary conditions and transport processes. Recent advances in machine learning (ML), particularly deep neural networks, offer new opportunities to complement traditional physics-based modeling. Here we review ML and artificial intelligence (AI) approaches, termed bottom-up data-driven methods, for dusty plasma research. Central to this effort is Dust Neural nEtworks Technology (DustNET), a community-driven dataset initiative inspired by ImageNet, integrating experimental, simulation, and synthetic data to enable predictive modeling, uncertainty quantification, and multi-scale analysis. DustNET-trained models may also be deployed in real-time experimental settings under edge computing constraints. Combined with emerging multi-modal AI foundation models and autonomous agents, this framework provides a pathway toward a unified, physics-informed understanding of dusty plasmas across laboratory, industrial, space, and astrophysical environments.

physics.plasm-ph

Controlling the electric force on a dust particle during the afterglow of a plasma at a higher gas pressure

When dust particles are immersed in a plasma, and the power that sustains a plasma is terminated, the charge of dust particles will change in the early afterglow, as electrons and ions gradually diminish in number. The possibility of controlling this charge, along with the electric force acting on the particles in the late afterglow, has earlier been demonstrated at a low gas pressure of 8 mTorr. Here, it is confirmed experimentally that controlling particles is possible also at a higher gas pressure of 90 mTorr, in a capacitively coupled radio-frequency plasma (CCP). A timed application of a DC electric field during the afterglow is a key element of this control scheme. Analyzing the experimental results, the electric force in the late afterglow was determined by comparing measurements of particle velocity to a prediction made by integrating the equation of motion, taking into account gas friction. In addition to applying friction to dust particles, gas also slows the drifting motion of electrons and ions, reducing their energy during the afterglow, but nevertheless we find that dust particles become charged in the afterglow so that one can apply an electric force to them that is comparable to the gravitational force, even at a higher pressure than had previously been demonstrated. This result extends the parameter range for which it is expected that particle contamination in semiconductor manufacturing can be mitigated by controlling charge and forces during the afterglow. Because of the way that forces scale with particle size, it is expected that submicron particles can be controlled even more easily than the larger spheres in the present experiment.

physics.plasm-ph