Data-driven local operator finding for reduced-order modelling of plasma systems: I. Concept and verificationsReduced-order plasma models that can efficiently predict plasma behavior across various settings and configurations are highly sought after yet elusive. The demand for such models has surged in the…Farbod Faraji, Maryam Reza, Aaron Knoll et al.·Mar 3, 2024SaveLearn
Tokamak to Stellarator Conversion using Permanent MagnetsWith the advances in the optimization of magnetic field equilibria, stellarators have become a serious alternative to the tokamak, bringing this concept to the forefront of the pursuit of fusion…M. Madeira, R. Jorge·Mar 1, 2024SaveLearn
When should PIC simulations be applied to atmospheric pressure plasmas? Impact of correlation heatingMolecular dynamics simulations are used to test when the particle-in-cell (PIC) method applies to atmospheric pressure plasmas. It is found that PIC applies only when the plasma density and…M. Acciarri, C. Moore, L. P. Beving et al.·Mar 1, 2024SaveLearn
Broadening of the Divertor Heat Flux Profile in High Confinement Tokamak Fusion Plasmas with Edge Pedestals Limited by Turbulence in DIII-DMulti-machine empirical scaling predicts an extremely narrow heat exhaust layer in future high magnetic field tokamaks, producing high power densities that require mitigation. In the experiments…D. R. Ernst, A. Bortolon, C. S. Chang et al.·Feb 29, 2024SaveLearn
Needed computations and computational capabilities for stellaratorsStellarator plasmas are externally controlled to a degree unparalleled by any other fusion concept, magnetic or inertial. This control is largely through the magnetic fields produced by external…Allen H Boozer·Feb 29, 2024SaveLearn
RMP screening in JOREK-CARIDDIEdge localized modes (ELMs) are instabilities at the tokamak edge that can have short outbursts of highly energetic particles and heat, which can severely damage the walls of a plasma reactor.…Bas Slotema, Matthias Hoelzl, Verena Mitterauer·Feb 29, 2024SaveLearn
Unraveling electronic correlations in warm dense quantum plasmasThe study of matter at extreme densities and temperatures has emerged as a highly active frontier at the interface of plasma physics, material science and quantum chemistry with direct relevance for…Tobias Dornheim, Tilo Döppner, Panagiotis Tolias et al.·Feb 29, 2024SaveLearn
Autoresonant Removal of Fusion Products in Mirror MachinesMagnetic confinement fusion reactors produce ash particles that must be removed for efficient operation. It is suggested to use autoresonance (a continuous phase-locking between anharmonic motion and…Eli Gudinetsky, Tal Miller, Ilan Be'ery et al.·Feb 28, 2024SaveLearn
External charge perturbation in a flowing plasma and electrostatic turbulenceIn this work, an 1D electrostatic hybrid-Particle-in-Cell-Monte-Carlo-Collisionh-PIC-MCC) code is used to study the response of a plasma to a moving, external, charged perturbation (debris). We show…Mridusmita Das, Madhurjya P. Bora·Feb 28, 2024SaveLearn
Analytic solutions for the linearized first-order magnetohydrodynamics and implications for causality and stabilityWe address the linear-mode analysis performed near an equilibrium configuration in the fluid rest frame with a dynamical magnetic field perturbed on a constant configuration. We develop a simple and…Zhe Fang, Koichi Hattori, Jin Hu·Feb 28, 2024SaveLearn
Current potential patchesA novel form of the current potential, a mathematical tool for the design of stellarators and stellarator coils, is developed. Specifically, these are current potentials with a finite-element-like…Todd Elder, Allen H Boozer·Feb 27, 2024SaveLearn
Impact of azimuthal forcing on the Brillouin limit in a collisional two-species Ohkawa filterThis paper investigates the physics of plasma separation in a two species rotating collisional Ohkawa filter, when the source of rotation is an orbital angular momentum carrying wave. The electric…Timothée Nicolas·Feb 27, 2024SaveLearn
Narrowband THz Emission from a Plasma Oscillator Imbedded in a Plasma Density GradientA novel method is presented for generating radiation using the beat wave associated with a bi-frequency laser pulse, to excite plasma oscillations in a plasma slab with a density gradient. By…Manoj Kumar, Bernhard Ersfeld, Jaeho Lee et al.·Feb 27, 2024SaveLearn
Stellarator equilibrium axis-expansion to all orders in distance from the axis for arbitrary plasma betaA systematic theory of the asymptotic expansion of the magnetohydrodynamic (MHD) equilibrium in the distance from the magnetic axis is developed to include arbitrary smooth currents near the magnetic…W. Sengupta, E. Rodriguez, R. Jorge et al.·Feb 26, 2024SaveLearn
Using Spherical Harmonics to solve the Boltzmann equation: an operator based approachThe transport of charged particles or photons in a scattering medium can be modelled with a Boltzmann equation. The mathematical treatment for scattering in such scenarios is often simplified if…Nils W. Schween, Brian Reville·Feb 26, 2024SaveLearn
Relativistic Alfvén turbulence at kinetic scalesIn a strongly magnetized, magnetically dominated relativistic plasma, Alfvénic turbulence can extend to scales much smaller than the particle inertial scales. It leads to an energy cascade somewhat…Cristian Vega, Stanislav Boldyrev, Vadim Roytershteyn·Feb 25, 2024SaveLearn
System size scaling of triangularity effects on global temperature gradient-driven gyrokinetic simulationsIn this work, we explore the triangularity effects on turbulent transport employing global gyrokinetic simulations performed with the ORB5 code. Numerous experiments on the Tokamak à Configuration…Giovanni Di Giannatale, Alberto Bottino, Stephan Brunner et al.·Feb 25, 2024SaveLearn
Prediction of Fishbone Linear Instability in Tokamaks with Machine Learning MethodsA machine learning based surrogate model for fishbone linear instability in tokamaks is constructed. Hybrid simulations with the kinetic-magnetohydrodynamic (MHD) code M3D-K is used to generate the…Z. Y. Liu, H. R. Qiu, G. Y. Fu et al.·Feb 23, 2024SaveLearn
Direct laser acceleration: A model for the electron injection from the walls of a cylindrical guiding structureWe use analytical methods and particle-in-cell simulation to investigate the origin of electrons accelerated by the process of direct laser acceleration driven by high-power laser pulses in preformed…P. Valenta, D. Maslarova, R. Babjak et al.·Feb 22, 2024SaveLearn
Global gyrokinetic analysis of Wendelstein 7-X discharge: unveiling the importance of trapped-electron-mode and electron-temperature-gradient turbulenceWe present the first nonlinear, gyrokinetic, radially global simulation of a discharge of the Wendelstein 7-X-like stellarator (W7-X), including kinetic electrons, an equilibrium radial electric…Felix Wilms, Alejandro Bañón Navarro, Thomas Windisch et al.·Feb 22, 2024SaveLearn
Development of a gyrokinetic-MHD energetic particle simulation code Part II: Linear simulations of Alfvén eigenmodes driven by energetic particlesWe have developed a hybrid code GMEC: Gyro-kinetic Magnetohydrodynamics (MHD) Energetic-particle Code that can numerically simulate energetic particle-driven Alfvén eigenmodes and energetic particle…Z. Y. Liu, P. Y. Jiang, S. Y. Liu et al.·Feb 22, 2024SaveLearn
The Maintenance of Coherent Vortex Topology by Lagrangian Chaos in Drift-Rossby Wave TurbulenceThis work introduces the "potential vorticity bucket brigade," a mechanism for explaining the resilience of vortex structures in magnetically confined fusion plasmas and geophysical flows.…Norman M. Cao, Di Qi·Feb 21, 2024SaveLearn
The Karzas-Latter-Seiler Model of a High-Altitude Electromagnetic Pulse: A New Numerical Code for an Old ModelA high-altitude nuclear blast can produce an electromagnetic pulse (EMP) capable of disrupting electronics on Earth. The basic phenomenology of the initial (E1) phase of the EMP was initially worked…Gavin S. Hartnett·Feb 21, 2024SaveLearn
Influence of the Dufour effect on striations formation in radio-frequency dischargesIn recent years, interest in striation phenomena in radio-frequency (rf) discharges has risen due to the availability of new experimental data and implementation of new computational models.…Dmitry Levko, Laxminarayan L. Raja·Feb 21, 2024SaveLearn
Thermal Weibel instability induced magnetic fields co-exist with linear wakes in laser-ionized plasmasWhen a moderately intense, few-picoseconds long laser pulse ionizes gas to produce an underdense plasma column, a linear relativistic plasma wave or wake can be excited by the self-modulation…Yipeng Wu, Audrey Farrell, Mitchell Sinclair et al.·Feb 21, 2024SaveLearn