Princeton Plasma Physics Laboratory

Laboratory Measurements of Energy Partitioning and Anomalous Electron Heating in Magnetized, Perpendicular Collisionless Shocks

Abstract We present laboratory results on energy partitioning from supercritical, magnetized collisionless shock experiments ( M A ∼ 8, M ms ∼ 4). We report the first observation of fully developed laboratory shocks that evolve for more than seven upstream ion gyroperiods and hav...

Characteristics of monotonic sheaths near a wall with grazing magnetic incidence

Abstract We consider a magnetised plasma in contact with an absorbing planar wall, where the angle α between the magnetic field and the wall is small, α ≪ 1 (in radians), and the plasma is uniform in the directions tangential to the wall. The finite ratio γ of the characteristic...

The geometry of flux surfaces with quasi-poloidal symmetry

Quasi-poloidal (QP) magnetic fields have desirable properties for confining plasma: no radial drift of guiding centres (with positive implications for neoclassical transport), zero Pfirsch–Schlüter current and a lower level of damping for poloidal flows. Despite their attractive...

Fine-tuning a universal machine-learned interatomic potential for oxygen plasma interactions with WS2

Molecular dynamics simulation of plasma–surface interactions requires an interatomic potential that is simultaneously accurate, computationally efficient, and able to describe many elements and bonding types in reactive systems. In principle, a foundation model for machine-learne...

Geodesic extended modes in low magnetic shear tokamaks and stellarators

Theories of ion-scale microinstabilities in tokamaks and stellarators typically assume that the passing electrons respond adiabatically due to their fast propagation speed. However, when the magnetic shear becomes sufficiently small, ion-scale modes can extend far along the magne...

Signaturesof Black Hole Spin in Horizon-Scale Polarimetry

The angular momentum of a black hole, usually expressed in terms of a dimensionless “spin,” both shapes the strong-field spacetime and provides a reservoir of rotational energy that can be exchanged with surrounding plasma. Very long baseline interferometry (VLBI) has now begun t...

Probing the Interface of Plasma, Metal, and Catalyst Support in Plasma-Assisted Dry Methane Reforming on Pt-Based Catalysts

Abstract Nonthermal plasma (NTP)-assisted dry methane reforming (DMR) on supported metal catalysts has emerged as a promising method for sustainable, electrified conversion of methane (CH4) and carbon dioxide (CO2) into carbon monoxide (CO) and hydrogen (H2), which are valuable c...

AI-coupled HPC Workflow Applications, Middleware and Performance

AI integration is revolutionizing the landscape of HPC simulations, enhancing the importance, use, and performance of AI-coupled HPC workflows. This paper surveys the diverse and rapidly evolving field of AI-driven HPC and provides a common conceptual basis for understanding such...

First-Principles Microkinetic Model for Ammonia Synthesis on Fe(110) under Nonequilibrium Programmable Heating and Quenching Operation

Abstract Traditional thermochemical processes typically operate under relatively static conditions, where conventional reactors restrict the time scales over which key reaction parameters (such as temperature) can be varied. Electrification via Joule heating offers a way to overc...

Plasmon-Driven ChargeTransfer Aids Selective NonthermalVibrational Excitation in Nitrobenzenethiol on Silver Nanoparticles:Insights from Embedded Correlated Wavefunction Calculations

Abstract In plasmonic photocatalysis, a commonly invoked reaction enhancement mechanism is the excitation of a metal-to-molecule charge transfer state, resulting in transient-ion formation. Once accessed, a transient-ion state leads to changes in the molecular geometry that can l...