469 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre for Arctic Gas Hydrate, Environment and ClimateNO44 papers
- Centre National de la Recherche ScientifiqueFR28 papers
- University of OsloNO21 papers
- Norwegian Computing CenterNO16 papers
- University of WarwickGB13 papers
- University of ArizonaUS12 papers
- Technical University of DenmarkDK11 papers
- KTH Royal Institute of TechnologySE10 papers
- Massachusetts Institute of TechnologyUS10 papers
- Norwegian University of Science and TechnologyNO10 papers
- Observatoire de ParisFR10 papers
- University Hospital of North NorwayNO10 papers
38 papers · 1 filter
Divertor shaping with neutral baffling as a solution to the tokamak power exhaust challenge
K. Verhaegh, J. R. Harrison, D. Moulton +20
Exhausting power from the hot fusion core to the plasma-facing components is one of the biggest challenges in fusion energy. The MAST Upgrade tokamak uniquely integrates strong con…
Stochastic modelling of blob-like plasma filaments in the scrape-off layer: Theoretical foundation
J. M. Losada, A. Theodorsen, O. E. Garcia
A stochastic model is presented for a super-position of uncorrelated pulses with a random distribution of amplitudes, sizes, velocities and arrival times. The pulses are assumed to…
Beyond the Oberbeck-Boussinesq and long wavelength approximation
Markus Held, Matthias Wiesenberger
We present the first simulations of a reduced magnetized plasma model that incorporates both arbitrary wavelength polarization and non-Oberbeck-Boussinesq effects. Significant infl…
Numerical turbulence simulations of intermittent fluctuations in the scrape-off layer of magnetized plasmas
Gregor Decristoforo, Audun Theodorsen, John Omotani +2
Intermittent fluctuations in the boundary of magnetically confined plasmas are investigated by numerical turbulence simulations of a reduced fluid model describing the evolution of…
Blob interaction in 2D scrape off layer simulations
Gregor Decristoforo, Fulvio Militello, Odd Erik Garcia +4
Interaction of coherent structures known as blobs in the scrape-off layer of magnetic confinement fusion devices is investigated. Isolated and interacting seeded blobs as well as f…
Comparison between mirror Langmuir probe and gas puff imaging measurements of intermittent fluctuations in the Alcator C-Mod scrape-off layer
R. Kube, A. Theodorsen, O. E. Garcia +3
Statistical properties of the scrape-off layer (SOL) plasma fluctuations are studied in ohmically heated plasmas in the Alcator C-Mod tokamak. For the first time, plasma fluctuatio…
Weakly nonlinear ion sound waves in gravitational systems
P. Guio, H. L. Pecseli
Ion sound waves are studied in a plasma subject to gravitational field. Such systems are interesting by exhibiting a wave growth that is a result of energy flux conservation in inh…
Non-Oberbeck-Boussinesq zonal flow generation
Markus Held, Matthias Wiesenberger, Ralph Kube +1
Novel mechanisms for zonal flow (ZF) generation for both large relative density fluctuations and background density gradients are presented. In this non-Oberbeck-Boussinesq (NOB) r…
Probability distribution functions for intermittent scrape-off layer plasma fluctuations
Audun Theodorsen, Odd Erik Garcia
A stochastic model for intermittent fluctuations in the scrape-off layer of magnetically confined plasmas has been constructed based on a super-position of uncorrelated pulses arri…
Outlier classification using Autoencoders: application for fluctuation driven flows in fusion plasmas
R. Kube, F. M. Bianchi, D. Brunner +1
Understanding the statistics of fluctuation driven flows in the boundary layer of magnetically confined plasmas is desired to accurately model the lifetime of the vacuum vessel com…
Intermittent electron density and temperature fluctuations and associated fluxes in the Alcator C-Mod scrape-off layer
Ralph Kube, Odd Erik Garcia, Audun Theodorsen +4
The Alcator C-Mod mirror Langmuir probe system has been used to sample data time series of fluctuating plasma parameters in the outboard mid-plane far scrape-off layer. We present…
Universality of Poisson-driven plasma fluctuations in the Alcator C-Mod scrape-off layer
A. Theodorsen, O. E. Garcia, R. Kube +2
Large-amplitude, intermittent fluctuations are ubiquitous in the boundary region of magnetically confined plasmas and lead to detrimental plasma-wall interactions in the next-gener…
Intermittent fluctuations due to uncorrelated Lorentzian pulses
O. E. Garcia, A. Theodorsen
Fluctuations due to a super-position of uncorrelated Lorentzian pulses with a random distribution of amplitudes and duration times are considered. These are demonstrated to be stro…
Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas
O. E. Garcia, R. Kube, A. Theodorsen +2
Plasma fluctuations in the scrape-off layer of the Alcator C-Mod tokamak in ohmic and high confinement modes have been analyzed using gas puff imaging data. In all cases investigat…
Skewed Lorentzian pulses and exponential frequency power spectra
O. E. Garcia, A. Theodorsen
Frequency power spectra due to a super-position of uncorrelated Lorentzian pulses with a random distribution of amplitudes are considered. For pulses with constant duration, there…
Isotope effect on blob-statistics in gyrofluid simulations of scrape-off layer turbulence
Ole Hauke Heinz Meyer, Alexander Kendl
We investigate time-series obtained from gyrofluid simulations in coupled edge/scrape-off layer turbulence characteristic for fusion edge-region plasmas. Blob birth near the separa…
Level crossings and excess times due to a super-position of uncorrelated exponential pulses
Audun Theodorsen, Odd Erik Garcia
A well-known stochastic model for intermittent fluctuations in physical systems is investigated. The model is given by a super-position of uncorrelated exponential pulses, and the…
Relationship between frequency power spectra and intermittent, large-amplitude bursts in the Alcator C-Mod scrape-off layer
A. Theodorsen, O. E. Garcia, R. Kube +2
Fluctuations in the boundary region of the Alcator C-Mod tokamak have been analyzed using gas puff imaging data from a set of Ohmically heated plasma density scan experiments. It i…
Auto-correlation function and frequency spectrum due to a super-position of uncorrelated exponential pulses
O. E. Garcia, A. Theodorsen
The auto-correlation function and the frequency power spectral density due to a super-position of uncorrelated exponential pulses are considered. These are shown to be independent…
Isotope effect on filament dynamics in fusion edge plasmas
Ole Hauke Heinz Meyer, Alexander Kendl
The influence of the ion mass on filament propagation in the scrape-off layer of toroidal magnetised plasmas is analysed for various fusion relevant majority species, like hydrogen…
Unified transport scaling laws for plasma blobs and depletions
Matthias Wiesenberger, Markus Held, Ralph Kube +1
We study the dynamics of seeded plasma blobs and depletions in an (effective) gravitational field. For incompressible flows the radial center of mass velocity of blobs and depletio…
Power law spectra and intermittent fluctuations due to uncorrelated Lorentzian pulses
O. E. Garcia, A. Theodorsen
A stochastic model for intermittent fluctuations due to a super-position of uncorrelated Lorentzian pulses is presented. For constant pulse duration, this is shown to result in an…
SOL width and intermittent fluctuations in KSTAR
O. E. Garcia, R. Kube, A. Theodorsen +5
Radial profiles of the ion saturation current and its fluctuation statistics are presented from probe measurements in L-mode, neutral beam heated plasmas at the outboard mid-plane…
Amplitude and size scaling for interchange motions of plasma filaments
R. Kube, M. Wiesenberger, O. E. Garcia
The interchange dynamics and velocity scaling of blob-like plasma filaments are investigated using a two-field reduced fluid model. For incompressible flows due to buoyancy the max…