Generation of narrow beams of ultrarelativistic positrons (electrons) in the resonant strong electromagnetic field-assisted Breit-Wheeler processThe resonant external field-assisted Breit-Wheeler process (Oleinik resonances) for strong electromagnetic fields with intensities less than the critical Schwinger field has been theoretically…S. P. Roshchupkin, V. D. Serov, V. V. Dubov·Jul 3, 2023SaveLearn
Beam current from downramp injection in electron-driven plasma wakefieldsWe study the stability of plasma wake wave and the properties of density-downramp injection in an electron-driven plasma accelerator. In this accelerator type, a short high-current electron bunch…Céline Hue, Anton Golovanov, Sheroy Tata et al.·Jul 2, 2023SaveLearn
Generation of intense cylindrical vector beams by Faraday effect in plasmaCylindrical vector (CV) beams, whose polarizations are cylindrically symmetric, have recently been widely applied in high energy density physics such as electron acceleration and intense…Wei Liu, Qing Jia, Jian Zheng·Jul 1, 2023SaveLearn
Machine learning for advancing low-temperature plasma modeling and simulationMachine learning has had an enormous impact in many scientific disciplines. Also in the field of low-temperature plasma modeling and simulation it has attracted significant interest within the past…Jan Trieschmann, Luca Vialetto, Tobias Gergs·Jun 30, 2023SaveLearn
Effect of interparticle fields and radiation reaction on beam dynamicsThe dynamics of relativistic particles in an intense electromagnetic field can be described by the Landau-Lifshitz (LL) equation, where the adiation reaction (RR) is accounted for via a self-force,…Michael J. Quin, Antonino Di Piazza, Christoph H. Keitel et al.·Jun 30, 2023SaveLearn
Wave propagation and transformation in the frame of magnetohydrodynamics with a vortex electric fieldBright transient objects in different wave bands have been discovered in recent years. To explain these short (from ms to s), and very powerful events different models, galactic and extragalactic,…G. S. Bisnovatyi-Kogan, I. A. Kondratyev, S. G. Moiseenko·Jun 30, 2023SaveLearn
Parallel flows as a key component to interpret Super-X divertor experimentsThe Super-X Divertor (SXD) is an alternative divertor configuration leveraging total flux expansion at the Outer Strike Point (OSP). While the extended 2-Point Model (2PM) predicts facilitated…M. Carpita, O. Février, H. Reimerdes et al.·Jun 30, 2023SaveLearn
Evidence of free-bound transitions in warm dense matter and their impact on equation-of-state measurementsWarm dense matter (WDM) is now routinely created and probed in laboratories around the world, providing unprecedented insights into conditions achieved in stellar atmospheres, planetary interiors,…Maximilian P. Böhme, Luke B. Fletcher, Tilo Döppner et al.·Jun 30, 2023SaveLearn
Robust stellarator optimization via flat mirror magnetic fieldsStellarator magnetic configurations need to be optimized in order to meet all the required properties of a fusion reactor. In this work, it is shown that a flat-mirror quasi-isodynamic configuration…J. L. Velasco, I. Calvo, E. Sánchez et al.·Jun 30, 2023SaveLearn
RF plugging of multi-mirror machinesOne of the main challenges of fusion reactors based on magnetic mirrors is the axial particle loss through the loss cones. In multi-mirror (MM) systems, the particle loss is addressed by adding…Tal Miller, Ilan Be'ery, Eli Gudinetsky et al.·Jun 29, 2023SaveLearn
Initial Fulcher band observations from high resolution spectroscopy in the MAST-U divertorHigh resolution Fulcher band spectroscopy was used in the MAST-U divertors during Super-X and elongated conventional divertor density ramps with D2 fuelling from the mid-plane high-field…N. Osborne, K. Verhaegh, M. D. Bowden et al.·Jun 29, 2023SaveLearn
Coherent radiation of an electron bunch colliding with an intense laser pulseWe study the conditions for coherent radiation of an electron bunch driven by a counterpropagating strong pulsed electromagnetic plane wave. We derive the spectrum of the coherent radiation and show…Evgeny Gelfer, Alexander Fedotov, Ondrej Klimo et al.·Jun 29, 2023SaveLearn
European Shock-Tube for High-Enthalpy Research Combustion Driver QualificationThe ESTHER shock tube is a new state-of-the-art facility at Instituto Superior Técnico designed to support future ESA planetary exploration missions. Its driver is a high-pressure combustion chamber…Ricardo Grosso Ferreira, Mário Lino da Silva·Jun 29, 2023SaveLearn
Annihilation-Gamma-based Diagnostic Techniques for Magnetically Confined Electron-Positron Pair PlasmaEfforts are underway to magnetically confine electron--positron pair plasmas to study their unique behavior, which is characterized by significant changes in plasma time and length scales, supported…J. von der Linden, S. Nißl, A. Deller et al.·Jun 29, 2023SaveLearn
Density jump as a function of magnetic field strength for perpendicular collisionless shocks with anisotropic upstream pressureShock waves are common in astrophysical environments. On many occasions, they are collisionless, which means they occur in settings where the mean free path is much larger than the dimensions of the…Antoine Bret·Jun 29, 2023SaveLearn
Kinetic Simulation of Ion Thruster Plume Neutralization in a Vacuum ChamberThe electrical environment of a ground vacuum testing chamber creates facility effects for gridded ion thrusters. For example, it is well known that the plume from the thruster generates current…Keita Nishii, Deborah Levin·Jun 29, 2023SaveLearn
Nonlinear interaction of Alfvénic instabilities and turbulence via the modification of the equilibrium profilesNonlinear simulations of Alfvén modes (AM) driven by energetic particles (EP) in the presence of turbulence are performed with the gyrokinetic particle-in-cell code ORB5. The AMs carry a heat flux,…A. Biancalani, A. Bottino, D. Del Sarto et al.·Jun 28, 2023SaveLearn
Understanding the level of Turbulence by Asymmetric Distributions: a motivation for measurements in Space PlasmasIn this article, on the basis of the Langevin equation applied to velocity fluctuations, we numerically model the Partial Variance of Increments, which is a useful tool to measure time and spatial…Iván Gallo-Méndez, Pablo S. Moya·Jun 27, 2023SaveLearn
Gyrokinetic theory of toroidal Alfvén eigenmode saturation via nonlinear wave-wave couplingNonlinear wave-wave coupling constitutes an important route for the turbulence spectrum evolution in both space and laboratory plasmas. For example, in a reactor relevant fusion plasma, a rich…Zhiyong Qiu, Liu Chen, Fulvio Zonca·Jun 27, 2023SaveLearn
The Effect of Ultrastrong Magnetic Fields on Laser-Produced Gamma-Ray FlashesLaser produced gamma-photons can make an important impact on applied and fundamental physics that require high gamma-photon yield and strong collimation. We propose addition of a constant…Prokopis Hadjisolomou, Rashid Shaisultanov, Tae Moon Jeong et al.·Jun 27, 2023SaveLearn
On Nonlinear Scattering of Drift Wave by Toroidal Alfven Eigenmode in Tokamak PlasmasUsing electron drift wave (eDW) as a paradigm model, we have investigated analytically direct wave-wave interactions between a test DW and ambient toroidal Alfvén eigenmodes (TAE) in toroidal…Liu Chen, Zhiyong Qiu, Fulvio Zonca·Jun 27, 2023SaveLearn
Manipulation of γ ray polarization in Compton scatteringHigh-brilliance high-polarization γ rays based on Compton scattering are of great significance in broad areas, such as nuclear, high-energy, astro-physics, etc. However, the transfer mechanism of…Yu Wang, Mamutjan Ababekri, Feng Wan et al.·Jun 26, 2023SaveLearn
Data-driven plasma modelling: Surrogate collisional radiative models of fluorocarbon plasmas from deep generative autoencodersWe have developed a deep generative model that can produce accurate optical emission spectra and colour images of an ICP plasma using only the applied coil power, electrode power, pressure and gas…Gregory A. Daly, Jonathan E. Fieldsend, Geoff Hassall et al.·Jun 26, 2023SaveLearn
PIC simulations of laser-induced proton acceleration by resonant nanoantennas for fusionRapid recent development in laser technology and methods learned from relativistic heavy ion physics led to new possibilities for fusion. Using a Hydrogen rich UDMA-TEGDMA polymer fusion target,…István Papp, Larissa Bravina, Mária Csete et al.·Jun 23, 2023SaveLearn
Contribution of fictitious forces to polarization drag in rotating mediaModels for polarization drag - mechanical analog of the Faraday effect - are extended to include inertial corrections to the dielectrics properties of the rotating medium in its rest-frame. Instead…Julien Langlois, Renaud Gueroult·Jun 23, 2023SaveLearn