E. Strumberger
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View article: Nonlinear MHD modeling of soft β limits in W7-AS
Nonlinear MHD modeling of soft β limits in W7-AS Open
An important question for the outlook of stellarator reactors is their robustness against pressure driven modes, and the underlying mechanism behind experimentally observed soft β limits. Towards building a robust answer to these questions…
View article: Effect of symmetry-breaking on the MHD edge stability limit of tokamak plasmas
Effect of symmetry-breaking on the MHD edge stability limit of tokamak plasmas Open
We demonstrate for the first time that symmetry-breaking in tokamak plasmas reduces the window of stable edge operational space, leading to a lower achievable edge pressure gradient. Predictive simulations with the linear magnetohydrodynam…
View article: Nonlinear MHD modeling of soft $β$ limits in W7-AS
Nonlinear MHD modeling of soft $β$ limits in W7-AS Open
An important question for the outlook of stellarator reactors is their robustness against pressure driven modes, and the underlying mechanism behind experimentally observed soft $β$ limits. Towards building a robust answer to these questio…
View article: Impact of toroidal rotation on the resistive ballooning modes in ASDEX Upgrade tokamak
Impact of toroidal rotation on the resistive ballooning modes in ASDEX Upgrade tokamak Open
In this work, we investigate the behavior of instabilities appearing between type-I edge localized modes (ELMs), with increasing neutral beam injection (NBI) power concomitant increase in toroidal rotation, and compare it to the modeling r…
View article: Helical mode localization and mode locking of ideal MHD instabilities in magnetically perturbed tokamak plasmas
Helical mode localization and mode locking of ideal MHD instabilities in magnetically perturbed tokamak plasmas Open
In H-mode tokamak plasmas, the achievable pressure-gradient is limited by type-I Edge Localized Modes (ELMs), which are projected to cause severe damage to future fusion devices. There are several approaches aiming to mitigate/suppress the…
View article: CASTOR3D: linear magnetohydrodynamics and diamagnetic drift effects
CASTOR3D: linear magnetohydrodynamics and diamagnetic drift effects Open
We upgrade the three-dimensional linear stability CASTOR3D code by taking into account gyro-viscosity in the momentum equation, as well as pressure and Hall terms in Ohm's law. Making use of the drift approximation, the resulting simplifie…
View article: How well can VMEC predict the initial saturation of external kink modes in near circular tokamaks and <i>l</i> <b>=</b> 2 stellarators?
How well can VMEC predict the initial saturation of external kink modes in near circular tokamaks and <i>l</i> <b>=</b> 2 stellarators? Open
The equilibrium code, VMEC, is used to study external kinks in low β tokamaks and l = 2 stellarators. The applicability of the code when modeling nonlinear MHD effects is explored in an attempt to understand and predict how the initial sat…
View article: How well can VMEC predict the initial saturation of external kink modes in near circular tokamaks and $l=2$ stellarators?
How well can VMEC predict the initial saturation of external kink modes in near circular tokamaks and $l=2$ stellarators? Open
The equilibrium code, VMEC, is used to study external kinks in low $β$ tokamaks and $l=2$ stellarators. The applicability of the code when modelling nonlinear MHD effects is explored in an attempt to understand and predict how the initial …
View article: An intuitive form of the energy functional for resistive plasma perturbations
An intuitive form of the energy functional for resistive plasma perturbations Open
The energy functional of ideal magnetohydrodynamics (MHD) is extended to the regime of finite resistivity and transformed into an intuitive form, which separates pressure-gradient, current-density drive and stabilising phenomena, analogous…
View article: Dataset from: An intuitive form of the energy functional for resistive plasma perturbations
Dataset from: An intuitive form of the energy functional for resistive plasma perturbations Open
The energy functional of ideal magnetohydrodynamics (MHD) is extended to the regime of finite resistivity and transformed to an intuitive form, which separates pressure-gradient, current-density drive and stabilizing phenomena, analogously…
View article: Dataset from: An intuitive form of the energy functional for resistive plasma perturbations
Dataset from: An intuitive form of the energy functional for resistive plasma perturbations Open
The energy functional of ideal magnetohydrodynamics (MHD) is extended to the regime of finite resistivity and transformed to an intuitive form, which separates pressure-gradient, current-density drive and stabilizing phenomena, analogously…
View article: JOREK3D: An extension of the JOREK nonlinear MHD code to stellarators
JOREK3D: An extension of the JOREK nonlinear MHD code to stellarators Open
Although the basic concept of a stellarator was known since the early days of fusion research, advances in computational technology have enabled the modeling of increasingly complicated devices, leading up to the construction of Wendelstei…
View article: Edge ICRF simulations in 3D geometry: From MHD equilibrium to coupling determination
Edge ICRF simulations in 3D geometry: From MHD equilibrium to coupling determination Open
We present in this work a consistent numerical scheme that allows the computation of 3D magnetic fields a nd 3D density profiles and their usage in ion cyclotron range of frequencies (ICRF) coupling simulations. We first utilize the PARVME…
View article: Validation of high-fidelity ion cyclotron range of frequencies antenna coupling simulations in full 3D geometry against experiments in the ASDEX Upgrade tokamak
Validation of high-fidelity ion cyclotron range of frequencies antenna coupling simulations in full 3D geometry against experiments in the ASDEX Upgrade tokamak Open
We address the validation of finite elements ion cyclotron range of frequencies (ICRF) antenna coupling simulation against experiments performed in the ASDEX Upgrade tokamak. Measurements of the loading resistance in ICRF-heated, magnetica…
View article: Extended full-MHD simulation of non-linear instabilities in tokamak plasmas
Extended full-MHD simulation of non-linear instabilities in tokamak plasmas Open
Non-linear magnetohydrodynamic (MHD) simulations play an essential role in active research and understanding of tokamak plasmas for the realization of a fusion power plant. The development of MHD codes such as JOREK is a key aspect of this…
View article: Edge ICRF simulations in 3D geometry: From MHD equilibrium to coupling determination
Edge ICRF simulations in 3D geometry: From MHD equilibrium to coupling determination Open
We present in this work a consistent numerical scheme that allows the computation of 3D magnetic fields a nd 3D density profiles and their usage in ion cyclotron range of frequencies (ICRF) coupling simulations. We first utilize the PARVME…
View article: Performance of Wendelstein 7-X stellarator plasmas during the first divertor operation phase
Performance of Wendelstein 7-X stellarator plasmas during the first divertor operation phase Open
Wendelstein 7-X is the first comprehensively optimized stellarator aiming at good confinement with plasma parameters relevant to a future stellarator power plant. Plasma operation started in 2015 using a limiter configuration. After instal…
View article: Dynamics of ideal modes and subsequent ELM crashes in 3D tokamak geometry from external magnetic perturbations
Dynamics of ideal modes and subsequent ELM crashes in 3D tokamak geometry from external magnetic perturbations Open
The impact of three-dimensional (3D) tokamak geometry from external magnetic perturbations on edge instabilities has been examined in high confinement mode plasmas with edge localised modes (ELMs) in ASDEX Upgrade. The 3D geometry has been…
View article: Field-Line Localized Destabilization of Ballooning Modes in Three-Dimensional Tokamaks
Field-Line Localized Destabilization of Ballooning Modes in Three-Dimensional Tokamaks Open
Field-line localized ballooning modes have been observed at the edge of high confinement mode plasmas in ASDEX Upgrade with rotating 3D perturbations induced by an externally applied n=2 error field and during a moderate level of edge loca…
View article: Three dimensional boundary displacement due to stable ideal kink modes excited by external n = 2 magnetic perturbations
Three dimensional boundary displacement due to stable ideal kink modes excited by external n = 2 magnetic perturbations Open
In low-collisionality scenarios exhibiting mitigation of edge localized modes\n(ELMs), stable ideal kink modes at the edge are excited by externally applied\nmagnetic perturbation (MP)-fields. In ASDEX Upgrade these modes can cause\nthree-…
View article: Investigation of the coupling properties of the ion cyclotron fast wave under applied magnetic perturbations and MHD phenomena in ASDEX Upgrade
Investigation of the coupling properties of the ion cyclotron fast wave under applied magnetic perturbations and MHD phenomena in ASDEX Upgrade Open
\nThe modulation of the ion cyclotron fast wave coupling to the plasma due to non-axisymmetric changes of the distance antenna-R-cutoff is studied. These changes can arise when magnetic perturbation (MP) fields are used, or when MHD activi…
View article: Experimental studies of high-confinement mode plasma response to non-axisymmetric magnetic perturbations in ASDEX Upgrade
Experimental studies of high-confinement mode plasma response to non-axisymmetric magnetic perturbations in ASDEX Upgrade Open
Here, the interaction of externally applied small non-axisymmetric magnetic perturbations (MP) with tokamak high-confinement mode (H-mode) plasmas is reviewed and illustrated by recent experiments in ASDEX Upgrade. The plasma response to t…
View article: Non-linear modeling of the plasma response to RMPs in ASDEX Upgrade
Non-linear modeling of the plasma response to RMPs in ASDEX Upgrade Open
The plasma response to resonant magnetic perturbations (RMPs) in ASDEX Upgrade is modeled with the non-linear resistive MHD code JOREK, using input profiles that match those of the experiments as closely as possible. The RMP configuration …
View article: Linear MHD stability studies with the STARWALL code
Linear MHD stability studies with the STARWALL code Open
The STARWALL/CAS3D/OPTIM code package is a powerful tool to study the linear MHD stability of 3D, ideal equilibria in the presence of multiply-connected ideal and/or resistive conducting structures, and their feedback stabilization by exte…
View article: Beta limit and plasma response to n=1 perturbations in ASDEX Upgrade
Beta limit and plasma response to n=1 perturbations in ASDEX Upgrade Open
V. Igochine, P. Lauber, P. Piovesan, M. Schneller, E. Strumberger, W. Suttrop, D.Yadykin, P.Bettini, A. Bogomolov, T. Bolzonella, I.G.J. Classen, M. Dunne, A. Gude, M. Maraschek, L. Marrelli, R. McDermott, M. Reich, G. Tardini, the EUROfus…