High-efficiency fast pinching radiation of electron beams in nonuniform plasmaThe continuous development of bright x/gamma-ray sources has opened up new frontiers of science and advanced applications. Currently, there is still a lack of efficient approaches to produce…Xing-Long Zhu, Min Chen, Zheng-Ming Sheng·Dec 20, 2024SaveLearn
Second harmonic generation by radially polarized laser beam propagating in homogeneous plasmaThis study presents an investigation of second harmonic generation (SHG) resulting from interaction of radially polarized laser beam propagating in homogeneous, unmagnetized plasma. Lorentz force and…Shivani Aggarwal, Saumya Singh, Dinkar Mishra et al.·Dec 19, 2024SaveLearn
ThinCurr: An open-source 3D thin-wall eddy current modeling code for the analysis of large-scale systems of conducting structuresIn this paper we present a new thin-wall eddy current modeling code, ThinCurr, for studying inductively-coupled currents in 3D conducting structures -- with primary application focused on the…Christopher Hansen, Alexander Battey, Anson Braun et al.·Dec 19, 2024SaveLearn
Single-mode laser guiding in non-parabolic plasma channels for high-energy electron accelerationThe discovery of laser wakefield acceleration in gaseous plasma was a major milestone that could lead to a significant reduction of size and cost of large electron accelerators. For higher-energy…Zsolt Lécz, Szilárd Majorosi, Nasr A. M. Hafz·Dec 19, 2024SaveLearn
An upper pressure limit for low-Z benign termination of runaway electron beams in TCVWe present a model for the particle balance in the post-disruption runaway electron plateau phase of a tokamak discharge. The model is constructed with the help of, and applied to, experimental data…M Hoppe, J Decker, U Sheikh et al.·Dec 19, 2024SaveLearn
The pellet rocket effect in magnetic confinement fusion plasmasPellets of frozen material travelling into a magnetically confined fusion plasma are accelerated by the so-called pellet rocket effect. The non-uniform plasma heats the pellet ablation cloud…Nico J. Guth, Oskar Vallhagen, Per Helander et al.·Dec 19, 2024SaveLearn
Exploration of the parameter space of piecewise omnigenous stellarator magnetic fieldsPiecewise omnigenous fields are stellarator magnetic fields that are optimized with respect to radial neoclassical transport thanks to a second adiabatic invariant that is piecewisely constant on the…J. L. Velasco, E. Sánchez, I. Calvo·Dec 19, 2024SaveLearn
Generation and Acceleration of Isolated-Attosecond Electron Bunch in a Hollow-Channel Plasma WakefieldWe propose a novel scheme for generating and accelerating simultaneously a dozen-GeV isolated attosecond electron bunch from an electron beam-driven hollow-channel plasma target. During the…Liang-Qi Zhang, Mei-Yu Si, Tong-Pu Yu et al.·Dec 19, 2024SaveLearn
A coordinate-free expression of plasma theoryThe theory of plasmas, that is collectives of charged particles, is developed using the coordinate-free and geometric methods of exterior calculus. This dramatically simplifies the algebra and gives…Michael E. Glinsky·Dec 18, 2024SaveLearn
Reactor-scale stellarators with force and torque minimized dipole coilsIn this work, we utilize new coil objectives for stellarator optimization with autodifferentiation, including pointwise and net coil-coil forces and torques. We use these methods to perform the first…Alan A. Kaptanoglu, Alexander Wiedman, Jacob Halpern et al.·Dec 18, 2024SaveLearn
Applicability of semi-classical theories in the strong field plasma regimeFor many purposes, classical plasma dynamics models can work surprisingly well even for strong electromagnetic fields, approaching the Schwinger critical fields, and high frequencies, approaching the…Haidar Al-Naseri, Gert Brodin·Dec 18, 2024SaveLearn
Degradation of Cyanobacterium Nostoc muscorum via Air, Oxygen, and Nitrogen low temperature plasmasCyanobacteria are prokaryotic microorganisms that possess the capability to convert light energy into chemical energy through the process of photosynthesis. These organisms exhibit numerous potential…Samaa Salah, Mohamed Mokhtar Hefny, Nabil M. El-Siragy et al.·Dec 18, 2024SaveLearn
Rayleigh-Taylor instability in inhomogeneous relativistic classical and degenerate electron-ion magnetoplasmasWe study the Rayleigh-Taylor instability (RTI) of electrostatic plane wave perturbations in compressible relativistic magnetoplasma fluids with thermal ions under gravity in three different cases of…R. Dey, A. P. Misra·Dec 18, 2024SaveLearn
Ion acoustic and spin electron acoustic cnoidal waves in a spin polarized plasma with exchange effectsSeparate spin evolution-quantum hydrodynamic (SSE-QHD) model is employed to address the nonlinear propagation of ion-acoustic wave (IAW) and spin electron-acoustic wave (SEAW) in a spin polarized…B. Sania, Z. Iqbal, Ch. Rozina et al.·Dec 18, 2024SaveLearn
Attention-aware convolutional neural networks for identification of magnetic islands in the tearing mode on EAST tokamakThe tearing mode, a large-scale MHD instability in tokamak, typically disrupts the equilibrium magnetic surfaces, leads to the formation of magnetic islands, and reduces core electron temperature and…Feifei Long, Yian Zhao, Yunjiao Zhang et al.·Dec 18, 2024SaveLearn
Explosive pulsed power to drive a vacuum tubeDevelopment of high-power pulsed radiation sources in any frequency range requires both generation of high power to drive the source and increasing the efficiency of supplied power to radiated…Alexandra Gurinovich·Dec 17, 2024SaveLearn
Determination of confinement regime boundaries via separatrix parameters on Alcator C-Mod based on a model for interchange-drift-Alfvén turbulenceThe separatrix operational space (SepOS) model [Eich \& Manz, Nuclear Fusion (2021)] is shown to predict the L-H transition, the L-mode density limit, and the ideal MHD ballooning limit in…M. A. Miller, J. W. Hughes, T. Eich et al.·Dec 17, 2024SaveLearn
An Efficient Surrogate Model of Secondary Electron Formation and EvolutionThis work extends the adjoint-deep learning framework for runaway electron (RE) evolution developed in Ref. [C. McDevitt et al., A physics-constrained deep learning treatment of runaway electron…Christopher J. McDevitt, Jonathan Arnaud, Xian-Zhu Tang·Dec 17, 2024SaveLearn
A Physics-Constrained Deep Learning Treatment of Runaway Electron DynamicsAn adjoint formulation leveraging a physics-informed neural network (PINN) is employed to advance the density moment of a runaway electron (RE) distribution forward in time. A distinguishing feature…Christopher J. McDevitt, Jonathan Arnaud, Xian-Zhu Tang·Dec 17, 2024SaveLearn
Development of self-modulation as a function of plasma lengthWe use numerical simulations to determine whether the saturation length of the self-modulation (SM) instability of a long proton bunch in plasma could be determined by measuring the radius of the…Arthur Clairembaud, Marlene Turner, Patric Muggli·Dec 17, 2024SaveLearn
A mechanism that could stop the acceleration process within a collisionless shockCollisionless shocks are complex nonlinear structures that are not yet fully understood. In particular, the interaction between these shocks and the particles they accelerate remains elusive. Based…Antoine Bret, Asaf Pe'er·Dec 17, 2024SaveLearn
Higher-order dissipative anisotropic magnetohydrodynamics from the Boltzmann-Vlasov equationWe apply the method of moments to the relativistic Boltzmann-Vlasov equation and derive the equations of motion for the irreducible moments of arbitrary tensor-rank of the invariant single-particle…Etele Molnár, Dirk H. Rischke·Dec 16, 2024SaveLearn
A Non-Negative Least Squares-based Approach for Moment-Preserving Particle MergingIn the present work, a novel particle merging scheme is proposed for PIC-DSMC simulations, based on the solution of a Non-negative Least Squares problem. The merging algorithm conserves arbitrary…Georgii Oblapenko·Dec 16, 2024SaveLearn
Capacitive-Tuned SIW Evanescent-Mode Cavity for Resonant Microwave Plasma JetThis paper introduces a novel atmospheric pressure and frequency-tunable microwave plasma jet utilizing evanescent-mode cavity resonator technology. The design uses a substrate-integrated waveguide…Kazi Sadman Kabir, Abbas Semnani·Dec 16, 2024SaveLearn
Efficient electron heating by laser in finite sized plasma micro-globular targets by repeated collisions of surface and bulk wavesA new mechanism of enhanced laser energy absorption in plasma microglobules is demonstrated with the help of two-dimensional Particle-In-Cell (PIC) simulations. The mechanism relies on the excitation…Animesh Sharma, Amita Das, G Ravindra Kumar·Dec 14, 2024SaveLearn