Functional perturbation theory under axisymmetry: Simplified formulae and their uses for tokamaksIn strictly axisymmetric configurations of tokamaks, field-line tracing reduces from a three-dimensional ODE system to a two-dimensional one, where Poincaré-Bendixson theorem applies and guarantees…Wenyin Wei, Liang Liao, Alexander Knieps et al.·Mar 8, 2025SaveLearn
Multiple solutions to the static forward free-boundary Grad-Shafranov problem on MAST-UThe Grad-Shafranov (GS) equation is a nonlinear elliptic partial differential equation that governs the ideal magnetohydrodynamic equilibrium of a tokamak plasma. Previous studies have demonstrated…K. Pentland, N. C. Amorisco, P. E. Farrell et al.·Mar 7, 2025SaveLearn
Crystal nucleation rates in one-component Yukawa systemsNucleation in the supercooled Yukawa system is relevant for addressing current challenges in understanding a range of crystallizing systems including white dwarf (WD) stars. We use both brute force…B. Arnold, J. Daligault, D. Saumon et al.·Mar 7, 2025SaveLearn
Suppressing grid instability and noise in particle-in-cell simulation by smoothingSmoothing short-wavelength charge density variations can stabilize explicit electrostatic particle-in-cell (PIC) plasma simulations against grid heating and cold beam instabilities, which cause…Gregory R. Werner, Luke C. Adams, John R. Cary·Mar 7, 2025SaveLearn
Computation of generalised magnetic coordinates asymptotically close to the separatrixIntegrals to calculate generalised magnetic coordinates from an input magnetic flux function asymptotically close to the separatrix are presented, and implemented in the GPEC/DCON code suite. These…Stuart Benjamin, Nikolas Logan, Christopher Hansen·Mar 6, 2025SaveLearn
Algebra of Invariants for the Vlasov-Maxwell SystemThe algebra of invariants for both the relativistic and nonrelativistic multispecies Vlasov-Maxwell system is examined, including the case with a fixed ion background. Invariants and their associated…Philip J. Morrison·Mar 6, 2025SaveLearn
Robustness Optimization for Compact Free-electron Laser Driven by Laser Wakefield AcceleratorsDespite the successful demonstration of compact free electron lasers (FELs) driven by laser wakefield accelerators (LWFAs), the inherent shot-to-shot fluctuations in LWFAs, including both laser and…Hai Jiang, Ke Feng, Runshu Hu et al.·Mar 5, 2025SaveLearn
The shear Alfvén continuum of quasisymmetric stellaratorsThe shear Alfvén wave (SAW) continuum plays a critical role in the stability of energetic particle-driven Alfvén eigenmodes. We develop a theoretical framework to analyze the SAW continuum in…Elizabeth J. Paul, Abdullah Hyder, Eduardo Rodríguez et al.·Mar 5, 2025SaveLearn
Nonlinear skin effect regime when a radio frequency electromagnetic field penetrates into a background plasmaTwo-dimensional, electromagnetic particle-in-cell simulations are employed to study particle kinetics and power deposition in the skin layer when a Radio Frequency (RF) electromagnetic field…Haomin Sun, Jian Chen, Alexander Khrabrov et al.·Mar 5, 2025SaveLearn
Quantitative Magnetohydrodynamic Modelling of Flux Pumping in ASDEX UpgradeThe sawtooth-free hybrid scenario has been achieved recently in ASDEX Upgrade (AUG) with applied non-inductive current sources and auxiliary heating [A. Burckhart et al 2023 Nucl. Fusion 63 126056].…Haowei Zhang, Matthias Hölzl, Isabel Krebs et al.·Mar 5, 2025SaveLearn
Novatron: Equilibrium and StabilityThe Novatron is a fusion concept characterized by its axisymmetric mirror-cusp magnetic topology. The magnetic field exhibits good curvature and a high mirror ratio. Plasma equilibrium profiles for…Kristoffer Lindvall, Rickard Holmberg, Katarina Bendtz et al.·Mar 5, 2025SaveLearn
Non-Linear behavior of the Electron Cyclotron Drift Instability and the Suppression of Anomalous CurrentWe present results of one-dimensional collisionless simulations of plasma turbulence and related anomalous electron current of the Electron Cyclotron Drift Instability (ECDI). Our highly resolved,…Aryan Sharma, Andrei Smolyakov, Raymond J. Spiteri·Mar 4, 2025SaveLearn
Investigation of Plasma Mixing Processes in the Context of Indirect Drive Inertial Confinement FusionIn inertial confinement fusion (ICF), the dynamics of plasma mixing in hohlraums critically influence laser-plasma instabilities (LPI) and implosion performance. This study investigates the mixing of…Xiaoran Li, Jie Qiu, Shuqing Zhang et al.·Mar 4, 2025SaveLearn
Longitudinal shaping of plasma waveguides using diffractive axicons for laser wakefield accelerationNew techniques for the optical generation of plasma waveguides -- optical fibres for ultra-intense light pulses -- have become vital to the advancement of multi-GeV laser wakefield acceleration.…N. Tripathi, B. Miao, A. Sloss et al.·Mar 3, 2025SaveLearn
Characterization of electron density and ionization of a uranium laser produced plasma using laser absorption spectroscopyHigh-resolution tunable laser spectroscopy is used to measure time-resolved absorption spectra for ten neutral uranium transitions and six singly-ionized transitions in a laser produced plasma.…Ryland G. Wala, Mathew P. Polek, Sivanandan S. Harilal et al.·Mar 3, 2025SaveLearn
Plasma Compressibility and the Generation of Electrostatic Electron Kelvin-Helmholtz InstabilityThis study explores the generation of Electrostatic (ES) Electron Kelvin-Helmholtz instability (EKHI) in collisionless plasma with a step-function electron velocity shear akin to that developed in…H. Che·Mar 1, 2025SaveLearn
Particle-based plasma simulation using a graph neural networkA surrogate model for particle-in-cell plasma simulations based on a graph neural network is presented. The graph is constructed in such a way as to enable the representation of electromagnetic…Marin Mlinarević, George K. Holt, Adriano Agnello·Mar 1, 2025SaveLearn
Hot-spot model for inertial confinement fusion implosions with an applied magnetic fieldImposing a magnetic field on inertial confinement fusion (ICF) implosions magnetizes the electrons in the compressed fuel; this suppresses thermal losses which increases temperature and fusion yield.…R. C. Spiers, A. Bose, C. A. Frank et al.·Feb 28, 2025SaveLearn
AE-driven Zonal Modes Produce Transport Barriers and Heat Thermal Ions by Cross-Scale InteractionsIn scenarios where a sustained energetic particle source strongly drives toroidal Alfvén eigenmodes (TAE), and phase-space transport is insufficient to saturate TAE, this novel theory of TAE-zonal…Qinghao Yan, P. H. Diamond·Feb 28, 2025SaveLearn
Interpreting AI for Fusion: an application to Plasma Profile Analysis for Tearing Mode StabilityAI models have demonstrated strong predictive capabilities for various tokamak instabilities--including tearing modes (TM), ELMs, and disruptive event--but their opaque nature raises concerns about…Hiro J Farre-Kaga, Andrew Rothstein, Rohit Sonker et al.·Feb 27, 2025SaveLearn
Runaway electron generation in disruptions mitigated by deuterium and noble gas injection in SPARCOne of the critical challenges in future high current tokamaks is the avoidance of runaway electrons during disruptions. Here, we investigate disruptions mitigated with combined deuterium and noble…I. Ekmark, M. Hoppe, R. A. Tinguely et al.·Feb 27, 2025SaveLearn
Latent Space Mapping: Revolutionizing Predictive Models for Divertor Plasma Detachment ControlThe inherent complexity of boundary plasma, characterized by multi-scale and multi-physics challenges, has historically restricted high-fidelity simulations to scientific research due to their…Ben Zhu, Menglong Zhao, Xue-Qiao Xu et al.·Feb 27, 2025SaveLearn
An Electromagnetic Particle-Particle Model on Solving Relativistic Binary CollisionWith the significant advancements in parallel computing techniques, the particle-particle (PP) model has been effectively utilized in various plasma-related applications. However, PP has been limited…Yanan Zhang, Xiaochun Ma, Hui Liu et al.·Feb 27, 2025SaveLearn
Computation of Magnetohydrodynamic Equilibria with Voigt RegularizationThis work presents the first numerical investigation of using Voigt regularization as a method for obtaining magnetohydrodynamic (MHD) equilibria without the assumption of nested magnetic flux…Yi-Min Huang, Justin Kin Jun Hew, Andrew Brown et al.·Feb 26, 2025SaveLearn
Conceptual study on using Doppler backscattering to measure magnetic pitch angle in tokamak plasmasWe introduce a new approach to measure the magnetic pitch angle profile in tokamak plasmas with Doppler backscattering (DBS), a technique traditionally used for measuring flows and density…AK Yeoh, VH Hall-Chen, QT Pratt et al.·Feb 26, 2025SaveLearn