Gyrokinetic prediction of core tungsten peaking in a WEST plasma with nitrogen impuritiesTungsten peaking is predicted in the core of a WEST plasma with total-f gyrokinetic simulations, including both collisional and turbulent transport. This prediction is validated with a synthetic…J. Dominski, P. Maget, O. Manas et al.·Oct 18, 2024SaveLearn
On the critical role of the rear wall thickness of a grooved TNSA targetThe cutoff energy and the divergence of the protons generated by the target normal sheath acceleration mechanism are known to be significantly influenced by micrometer and nanometer-size structures…Imran Khan, Vikrant Saxena·Oct 18, 2024SaveLearn
Plasma-Metal Junction:A Junction With Negative Turn-On VoltageUnlike junctions in solid-state devices, a plasma-metal junction (pm-junction) is a junction of classical and quantum electrons. The plasma electrons are Maxwellain in nature, while metal electrons…Sneha Latha Kommuguri, Smrutishree Pratihary, Thangjam Rishikanta Singh et al.·Oct 18, 2024SaveLearn
Identifying the Growth Phase of Magnetic Reconnection using Pressure-Strain InteractionMagnetic reconnection often initiates abruptly and then rapidly progresses to a nonlinear quasi-steady state. While satellites frequently detect reconnection events, ascertaining whether the system…M. Hasan Barbhuiya, Paul A. Cassak, Alex Chasapis et al.·Oct 18, 2024SaveLearn
FEQIS: A free-boundary equilibrium solver for integrated modeling of tokamak plasmasA new axisymmetric equilibrium solver has been written, called FEQIS (Flexible EQuIlibrium Solver), which purpose is to be used inside integrated modeling of tokamak plasmas. The FEQIS code solves…E. Fable, G. Tardini, L. Giannone et al.·Oct 17, 2024SaveLearn
Applications of Computational Topology to Fusion ScienceThree novel applications of computational topology in the field of fusion science are developed. A procedure for the automatic classification of the orbits of magnetic field lines into topologically…Nicholas Bohlsen·Oct 17, 2024SaveLearn
Designing a Validation Experiment for Radio Frequency CondensationTheoretical studies have suggested that nonlinear effects can lead to "radio frequency condensation", which coalesces RF power deposition and driven current near the center of a magnetic…Lanke Fu, E. Litvinova Mitra, R. Nies et al.·Oct 17, 2024SaveLearn
Designing tungsten armoured plasma facing components to pulsed heat loads in magnetic fusion machinesA possible design rule for preventing surface damage from thermal transients to solid tungsten armour is proposed and formulated for the plasma facing components (divertor, first wall) of magnetic…R Mitteau, M Diez, M Firdaouss·Oct 17, 2024SaveLearn
X-ray free-electron lasing in a flying-focus undulatorLaser-driven free-electron lasers (LDFELs) replace magnetostatic undulators with the electromagnetic fields of a laser pulse. Because the undulator period is half the wavelength of the laser pulse,…D. Ramsey, B. Malaca, T. T. Simpson et al.·Oct 16, 2024SaveLearn
Collimated γ-flash emission along the target surface irradiated by a laser at non-grazing incidenceThe interaction of a high-power laser with a solid target provides ways to produce beams of γ-photons. For normal incidence of the laser on the target the beams usually appear in a form of two…M. Matys, P. Hadjisolomou, R. Shaisultanov et al.·Oct 16, 2024SaveLearn
Impact of Ion Mobility on Electron Density and Temperature in Hypersonic FlowsThis study provides the first comprehensive analysis of how ion mobility affects electron density and temperature in hypersonic flows. We compare two ion mobility models: one derived from Gupta-Yos…Felipe Martin Rodriguez Fuentes, Bernard Parent·Oct 16, 2024SaveLearn
Efficient generation of divergent and collimated hot electrons via a novel multi-beam two-plasmon decay and stimulated Raman scattering mechanismIn inertial confinement fusion (ICF) implosions, the preheating risks associated with hot electrons generated by laser plasma instabilities (LPI) are contingent upon the angular characteristics of…K. Y. Meng, Z. H. Cai, J. Li et al.·Oct 16, 2024SaveLearn
Nonlinear Bayesian Doppler Tomography for Simultaneous Reconstruction of Flow and TemperatureWe present a nonlinear Bayesian tomographic framework for Doppler spectral imaging that enables simultaneous reconstruction of emissivity, ion temperature, and flow velocity from line-integrated…Kenji Ueda, Masaki. Nishiura·Oct 16, 2024SaveLearn
Real-time steerable frequency-stepped Doppler Backscattering (DBS) System for local helicon wave electric field measurements on the DIII-D tokamakA new frequency-stepped Doppler backscattering (DBS) system has been integrated with a real-time steerable electron cyclotron heating launcher to probe local background turbulence (f<10 MHz) and…S. Chowdhury, N. A. Crocker, W. A. Peebles et al.·Oct 16, 2024SaveLearn
Energy-momentum-conserving stochastic differential equations and algorithms for nonlinear Landau-Fokker-Planck equationCoulomb collision is a fundamental diffusion process in plasmas that can be described by the Landau-Fokker-Planck (LFP) equation or the stochastic differential equation (SDE). While energy and…Yichen Fu, Justin R. Angus, Hong Qin et al.·Oct 15, 2024SaveLearn
A Subgrid Model for Electron-Scale Turbulent Transport in Global Ion-Scale Gyrokinetic Simulations of Tokamak PlasmasA subgrid electron-temperature-gradient (ETG) model is demonstrated here which averages local electron-scale turbulence from the GENE code over intermediate scales in space and time to include in…Stefan Tirkas, Yang Chen, Scott Parker·Oct 15, 2024SaveLearn
Nonlinear Gaussian process tomography with imposed non-negativity constraints on physical quantities for plasma diagnosticsWe propose a novel tomographic method, nonlinear Gaussian process tomography (nonlinear GPT), that uses the Laplace approximation to impose constraints on non-negative physical quantities, such as…Kenji Ueda, Masaki Nishiura·Oct 15, 2024SaveLearn
Linear and Nonlinear Dynamics of Self-Consistent Collisionless Tearing Modes in Toroidal Gyrokinetic SimulationsWe investigate tearing modes (TM) driven by current density gradient in collisionless tokamak plasmas by using the electromagnetic gyrokinetic simulation code ORB5. We elucidate the TM width by…Fabien Widmer, Emanuele Poli, Alexey Mishchenko et al.·Oct 15, 2024SaveLearn
Differentiable Programming for Computational Plasma PhysicsDifferentiable programming allows for derivatives of functions implemented via computer code to be calculated automatically. These derivatives are calculated using automatic differentiation (AD).…Nick McGreivy·Oct 15, 2024SaveLearn
Reducing turbulent transport in tokamaks by combining intrinsic rotation and the low momentum diffusivity regimeBased on the analysis of a large number of high-fidelity nonlinear gyrokinetic simulations, we propose a novel strategy to improve confinement in spherical tokamak plasmas by combining up-down…Haomin Sun, Justin Ball, Stephan Brunner et al.·Oct 14, 2024SaveLearn
AI-Driven Autonomous Control of Proton-Boron Fusion Reactors Using Backpropagation Neural NetworksProton-boron (p-11B) fusion presents a promising path towards sustainable, neutron-free energy generation. However, its implementation is hindered by extreme operational conditions, such as plasma…Michele Laurelli·Oct 14, 2024SaveLearn
Manipulation of annular electron beams in plasmasThe annular electron beam has significant practical potential in high-energy physics and condensed matter physics, which can be used to edge-enhancement electron imaging, collimation of antiprotons…Yangchun Liu, Dong Wu, Tianyi Liang et al.·Oct 14, 2024SaveLearn
Beam Pointing of Relativistic High-order Harmonics Genrated on a Nonuniform Pre-plasmaThe use of tunable pre-pulse is a common technique to enhance the high-order harmonic generation from surface plasma. The shape and dynamic of the electron density, the degree of ionization and its…Chaoneng Wu, Yiming Xu, Andre Kalouguine et al.·Oct 13, 2024SaveLearn
Radiatively Cooled Magnetic Reconnection Experiments Driven by Pulsed PowerMagnetic reconnection is a ubiquitous process in astrophysical plasmas, responsible for the explosive conversion of magnetic energy into thermal and kinetic energy. In extreme astrophysical systems,…Rishabh Datta·Oct 13, 2024SaveLearn
Electromagnetic coil optimization for reduced Lorentz forcesThe reduction of magnetic forces on electromagnetic coils is an important consideration in the design of high-field devices such as the stellarator or tokamak. Unfortunately, these forces may be too…Siena Hurwitz, Matt Landreman, Alan Kaptanoglu·Oct 12, 2024SaveLearn