69 citations · 411 across the 28 of their papers we have counts for
28 papers
Long lasting plasma density structures utilizing tailored density profiles
Mufei Luo, Caterina Riconda, Anna Grassi +4
Using fully kinetic Particle In Cell simulations, we investigate the stability and performance of autoresonant plasma beat wave excitation in plasmas with tailored density profiles…
The pellet rocket effect in magnetic confinement fusion plasmas
Nico J. Guth, Oskar Vallhagen, Per Helander +3
Pellets 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 abla…
Reduced modeling of scrape-off losses of runaway electrons during tokamak disruptions
Oskar Vallhagen, Lise Hanebring, Tünde Fülöp +2
Accurate modeling of runaway electron generation and losses during tokamak disruptions is crucial for the development of reactor-scale tokamak devices. In this paper we present a r…
Evolution of the autoresonant plasma wave excitation in two-dimensional particle-in-cell simulations
Mufei. Luo, Caterina. Riconda, Anna. Grassi +4
The generation of an autoresonantly phase-locked high amplitude plasma waves to the chirped beat frequency of two driving lasers is studied in two dimensions using particle-in-cell…
Fluid and kinetic studies of tokamak disruptions using Bayesian optimization
Ida Ekmark, Mathias Hoppe, Tünde Fülöp +4
When simulating runaway electron dynamics in tokamak disruptions, fluid models with lower numerical cost are often preferred to more accurate kinetic models. The aim of this work i…
Bayesian optimization of massive material injection for disruption mitigation in tokamaks
Istvan Pusztai, Ida Ekmark, Hannes Bergström +5
A Bayesian optimization framework is used to investigate scenarios for disruptions mitigated with combined deuterium and neon injection in ITER. The optimization cost function take…
On the minimum transport required to passively suppress runaway electrons in SPARC disruptions
R. A. Tinguely, I. Pusztai, V. A. Izzo +8
In [V.A. Izzo et al 2022 Nucl. Fusion 62 096029], state-of-the-art modeling of thermal and current quench (CQ) MHD coupled with a self-consistent evolution of runaway electron (RE)…
Modeling the complete prevention of disruption-generated runaway electron beam formation with a passive 3D coil in SPARC
RA Tinguely, VA Izzo, DT Garnier +8
The potential formation of multi-mega-ampere beams of relativistic "runaway" electrons (REs) during sudden terminations of tokamak plasmas poses a significant challenge to the toka…
Generation of attosecond electron bunches and X-ray pulses from few-cycle femtosecond laser pulses
Julien Ferri, Vojtech Horný, Tünde Fülöp
Laser-plasma electron accelerators can be used to produce high-intensity X-rays, as electrons accelerated in wakefields emit radiation due to betatron oscillations.Such X-ray sourc…
Spatiotemporal analysis of the runaway distribution function from synchrotron images in an ASDEX Upgrade disruption
M. Hoppe, L. Hesslow, O. Embreus +14
Synchrotron radiation images from runaway electrons (REs) in an ASDEX Upgrade discharge disrupted by argon injection are analyzed using the synchrotron diagnostic tool SOFT and cou…
Kinetic modelling of runaway electron generation in argon-induced disruptions in ASDEX Upgrade
K. Insulander Björk, G. Papp, O. Embreus +8
Massive material injection has been proposed as a way to mitigate the formation of a beam of relativistic runaway electrons that may result from a disruption in tokamak plasmas. In…
Effects of oblique incidence and colliding pulses on laser-driven proton acceleration from relativistically transparent ultrathin targets
Julien Ferri, Evangelos Siminos, Laurent Gremillet +1
The use of ultrathin solid foils offers optimal conditions for accelerating protons from laser-matter interactions. When the target is thin enough that relativistic self-induced tr…
Spin-orbit interaction in a high-power laser irradiated micro-scale plasma waveguide
Longqing Yi, Ke Hu, Tünde Fülöp
Light carries angular momentum as spin and orbital components. The spin-orbit interaction (SOI) of light refers to phenomena in which the spin (left or right circular polarisation)…
Proton Acceleration in a Laser-induced Relativistic Electron Vortex
Longqing Yi, István Pusztai, Alexander Pukhov +2
We show that when a solid plasma foil with a density gradient on the front surface is irradiated by an intense laser pulse at a grazing angle, around 80 degrees, a relativistic ele…
Dynamics of positrons during relativistic electron runaway
Ola Embréus, Linnea Hesslow, Mathias Hoppe +3
Sufficiently strong electric fields in plasmas can accelerate charged particles to relativistic energies. In this paper we describe the dynamics of positrons accelerated in such el…
Electron beam driven generation of frequency-tunable isolated relativistic sub-cycle pulses
Illia Thiele, Evangelos Siminos, Tünde Fülöp
We propose a novel scheme for frequency-tunable sub-cycle electromagnetic pulse generation. To this end a pump electron beam is injected into an electromagnetic seed pulse as the l…
Proton acceleration by a pair of successive ultraintense femtosecond laser pulses
Julien Ferri, Lovisa Senje, Malay Dalui +12
We investigate the target normal sheath acceleration of protons in thin aluminum targets irradiated at relativistic intensity by two time-separated ultrashort (35 fs) laser pulses.…
Effect of partially ionized impurities and radiation on the effective critical electric field for runaway generation
Linnea Hesslow, Ola Embréus, George J Wilkie +2
We derive a formula for the effective critical electric field for runaway generation and decay that accounts for the presence of partially ionized impurities in combination with sy…
Origins of plateau formation in ion energy spectra under target normal sheath acceleration
Timothy C. DuBois, Evangelos Siminos, Julien Ferri +2
Target normal sheath acceleration (TNSA) is a method employed in laser--matter interaction experiments to accelerate light ions (usually protons). Laser setups with durations of a…
Low Mach-number collisionless electrostatic shocks and associated ion acceleration
Istvan Pusztai, Jason M. TenBarge, Aletta N. Csapó +4
The existence and properties of low Mach-number () electrostatic collisionless shocks are investigated with a semi-analytical solution for the shock structure. We show…
Effect of partially-screened nuclei on fast-electron dynamics
Linnea Hesslow, Ola Embréus, Adam Stahl +4
We analyze the dynamics of fast electrons in plasmas containing partially ionized impurity atoms, where the screening effect of bound electrons must be included. We derive analytic…
Global anomalous transport of ICRH- and NBI-heated fast ions
George J. Wilkie, Istvan Pusztai, Ian G. Abel +2
By taking advantage of the trace approximation, one can gain an enormous computational advantage when solving for the global turbulent transport of impurities. In particular, this…
Energetic electron transport in the presence of magnetic perturbations in magnetically confined plasmas
Gergely Papp, Michael Drevlak, Gergő I. Pokol +1
The transport of energetic electrons is sensitive to magnetic perturbations. By using 3D numerical simulation of test particle drift orbits we show that the transport of untrapped…
Bump formation in the runaway electron tail
J. Decker, E. Hirvijoki, O. Embreus +4
Runaway electrons are generated in a magnetized plasma when the parallel electric field exceeds a critical value. For such electrons with energies typically reaching tens of MeV, t…