64 papers
This paper introduces a fully relativistic close-coupling approach that incorporates plasma screening effects to model Stark broadening, resolving theoretical bottlenecks in electron-ion collisions and providing a quantum-mechanical interpretation of screening factors for improved plasma diagnostics.
This paper presents a universal theoretical model that successfully predicts the maximum energy limits of radiation belts across planetary and brown dwarf magnetospheres using only surface magnetic field strength, revealing a 7 TeV asymptotic bound and offering new insights into galactic cosmic ray sources and exoplanet habitability.
This paper proposes a compact, self-probing scheme using GeV electron beams and petawatt lasers to generate and detect vacuum birefringence via high-energy gamma-ray polarimetry, demonstrating through simulations that this approach can achieve the first laboratory observation of this nonlinear QED effect with current technology.
This study demonstrates that anomalous, diffusive particle transport in tokamak edge turbulence arises inherently from fundamental non-linear drift dynamics, with transport coefficients scaling according to the spectral properties of turbulent energy.
This study on ASDEX Upgrade H-mode plasmas reveals that strong electron heating induces hollow toroidal rotation profiles by generating a counter-current intrinsic torque through a transition to mixed ITG-TEM turbulence, which balances inward convective momentum transport and is critically influenced by pedestal-top density.
This paper demonstrates that fine-tuning a PDE foundation model on the JAG benchmark significantly improves sample efficiency and accuracy in the inverse estimation of inertial confinement fusion system parameters from multi-modal observations, particularly in data-limited regimes.
This paper introduces a deflation technique that modifies the objective function to penalize previously found solutions, enabling the efficient discovery of multiple distinct, high-quality stellarator equilibria and coil designs from a single initial guess without relying on prescient starting points.
This paper presents an unbiased method for mapping particles to distribution functions that unifies Boltzmann's and Gibbs' paradigms to derive the principle of maximum entropy, enabling a rigorous statistical mechanical treatment of self-gravitating systems through the decoupling of time and ensemble averages.
This paper establishes a theoretical framework for stellarator coil winding surfaces that proves a dichotomy principle for current distributions on toroidal shapes and demonstrates that oppositely oriented currents on piecewise cylindrical surfaces generate center and saddle point regions with predominantly periodic field lines, offering key insights for optimizing coil design.
This study presents the first experimental characterization of plasma parameters and carbon decontamination rates in microwave resonators used for particle accelerators, utilizing Langmuir probes and quartz crystal microbalances to optimize the in-situ plasma cleaning of superconducting radio frequency cavities.
Using a cylindrical theory model, this study demonstrates that while neoclassical toroidal viscosity (NTV) has negligible impact on plasma flow at the resonant surface, it significantly alters core rotation profiles and, in conjunction with electromagnetic torque under non-uniform pressure conditions, helps maintain the locked mode state.
This paper presents the first systematic thermal analysis of tungsten-based plasma-facing components in the SPARC tokamak, evaluating damage characteristics like melt depth and vaporization losses caused by runaway electron beams during vertical displacement events.
This paper proposes a simple numerical method based on inverse transform sampling to efficiently load relativistic Maxwellian-type distributions by approximating the cumulative distribution of a shifted-Maxwellian energy distribution with an invertible function to generate random energy and momentum variates.
This study demonstrates that incorporating magnetic drift into orbit models significantly alters the potential landscape governing ambipolar electric field selection in non-axisymmetric plasmas, offering an explanation for discrepancies between simulations and experiments while highlighting the field's increased susceptibility to noise-induced state transitions.
Using high-resolution MMS data, this study provides observational evidence that ion-acoustic-like electrostatic wave activity is causally linked to the formation of cavitons (localized density depletions) within foreshock transients, a relationship best quantified by normalizing potential fluctuations by electron temperature.
This study utilizes multi-point in-situ observations of Earth's bow shock to demonstrate that backstreaming ions create cavitons that facilitate the formation of a new quasi-parallel supercritical shock layer through the nonlinear growth driven by gyrating suprathermal ions and subsequent plasma compression.
This paper demonstrates that arbitrarily small odd-parity perturbations fundamentally alter the topology of zero-helicity vortices and field-reversed configurations by transforming their interior flux surfaces from toroidal to simply connected, thereby necessitating a revision of established models in both fusion confinement physics and fluid dynamics.
This paper presents ion-motion simulations of beam-driven plasma wakefields at the FLASHForward facility, demonstrating that the motion of ions, often assumed to be stationary, significantly impacts beam dynamics by causing longitudinally dependent emittance growth.
This paper presents a physics-based interpretability framework using Shapley analysis to decode an AI model's predictions of tearing mode stability in tokamaks, revealing that core electron temperature and rotation peaking are the primary drivers of stability in DIII-D experiments.
Two-dimensional particle-in-cell simulations reveal that magnetic reconnection generates strong out-of-plane magnetic fields within flux ropes through distinct mechanisms—specifically the Weibel instability driven by electron temperature anisotropy in the absence of a guide field and separatrix currents reinforced by the Kelvin-Helmholtz instability in its presence—which subsequently scatter electrons and influence heating processes.