73 citations · 486 across the 27 of their papers we have counts for
27 papers
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…
Runaway Electron Dynamics in ITER Disruptions with Shattered Pellet Injections
Oskar Vallhagen, Lise Hanebring, Javier Artola +6
This study systematically explores the parameter space of disruption mitigation through shattered pellet injection in ITER with a focus on runaway electron dynamics, using the disr…
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)…
Feasibility of the EDICAM camera for runaway electron detection in JT-60SA disruptions
Soma Olasz, Mathias Hoppe, Tamás Szepesi +3
The visible camera system EDICAM (Event Detection Intelligent Camera), recently installed on JT-60SA, is simulated to assess whether it can be used for measuring synchrotron radiat…
Parametric scaling of power exhaust in EU-DEMO alternative divertor simulations
A. E. Järvinen, L. Aho-Mantila, T. Lunt +3
Investigations of parametric scaling of power exhaust in the alternative divertor configuration (ADC) SOLPS-ITER simulation database of the EU-DEMO are conducted and compared to pr…
Runaway dynamics in reactor-scale spherical tokamak disruptions
E. Berger, I. Pusztai, S. L. Newton +4
Understanding generation and mitigation of runaway electrons in disruptions is important for the safe operation of future tokamaks. In this paper we investigate runaway dynamics in…
Bayesian approach for validation of runaway electron simulations
Aaro Järvinen, Tünde Fülöp, Eero Hirvijoki +3
Plasma-terminating disruptions in future fusion reactors may result in conversion of the initial current to a relativistic runaway electron beam. Validated predictive tools are req…
Runaway dynamics in disruptions with current relaxation
István Pusztai, Mathias Hoppe, Oskar Vallhagen
The safe operation of tokamak reactors requires a reliable modeling capability of disruptions, and in particular the spatio-temporal dynamics of associated runaway electron current…
Runaway electron generation during tokamak start-up
M. Hoppe, I. Ekmark, E. Berger +1
Tokamak start-up is characterized by low electron densities and strong electric fields, in order to quickly raise the plasma current and temperature, allowing the plasma to fully i…
Effect of Two-Stage Shattered Pellet Injection on Tokamak Disruptions
O. Vallhagen, I. Pusztai, M. Hoppe +2
An effective disruption mitigation system in a tokamak reactor should limit the exposure of the wall to localized heat losses and to the impact of high current runaway electron bea…
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…
The hot-tail runaway seed landscape during the thermal quench in tokamaks
Ida Svenningsson, Ola Embreus, Mathias Hoppe +2
Runaway electron populations seeded from the hot-tail generated by the rapid cooling in plasma-terminating disruptions are a serious concern for next-step tokamak devices such as I…
DREAM: a fluid-kinetic framework for tokamak disruption runaway electron simulations
M. Hoppe, O. Embreus, T. Fülöp
Avoidance of the harmful effects of runaway electrons (REs) in plasma-terminating disruptions is pivotal in the design of safety systems for magnetic fusion devices. Here, we descr…
Validity of models for Dreicer generation of runaway electrons in dynamic scenarios
S. Olasz, O. Embreus, M. Hoppe +6
Runaway electron modelling efforts are motivated by the risk these energetic particles pose to large fusion devices. The sophisticated kinetic models can capture most features of t…
Tomographic reconstruction of the runaway distribution function in TCV using multispectral synchrotron images
T. A. Wijkamp, A. Perek, J. Decker +8
Synchrotron radiation observed in a quiescent TCV runaway discharge is studied using filtered camera images targeting three distinct wavelength intervals. Through the tomographic S…
Runaway electron modelling in the self-consistent core European Transport Simulator, ETS
Gergo I. Pokol, Soma Olasz, Boglarka Erdos +12
Relativistic runaway electrons are a major concern in tokamaks. The European framework for Integrated Modelling (EU-IM), facilitates the integration of different plasma simulation…
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…
Runaway electron synchrotron radiation in a vertically translated plasma
M. Hoppe, G. Papp, T. Wikjamp +6
Synchrotron radiation observed from runaway electrons (REs) in tokamaks depends upon the position and size of the RE beam, the RE energy and pitch distributions, as well as the loc…
Evaluation of the Dreicer runaway generation rate in the presence of high-Z impurities using a neural network
L Hesslow, L Unnerfelt, O Vallhagen +4
Integrated modelling of electron runaway requires computationally expensive kinetic models that are self-consistently coupled to the evolution of the background plasma parameters.…
Experimental and synthetic measurements of polarized synchrotron emission from runaway electrons in Alcator C-Mod
R. A. Tinguely, M. Hoppe, R. S. Granetz +2
This paper presents the first experimental analysis of polarized synchrotron emission from relativistic runaway electrons (REs) in a tokamak plasma. Importantly, we show that the p…
Spatiotemporal evolution of runaway electrons from synchrotron images in Alcator C-Mod
R. A. Tinguely, R. S. Granetz, M. Hoppe +1
In the Alcator C-Mod tokamak, relativistic runaway electron (RE) generation can occur during the flattop current phase of low density, diverted plasma discharges. Due to the high t…
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…
Generalized collision operator for fast electrons interacting with partially ionized impurities
L Hesslow, O Embréus, M Hoppe +4
Accurate modelling of the interaction between fast electrons and partially ionized atoms is important for evaluating tokamak disruption mitigation schemes based on material injecti…