38 citations · 133 across the 10 of their papers we have counts for
10 papers
Flux pumping and bifurcated relaxations of helical core in 3D magnetohydrodynamic modelling of ASDEX Upgrade plasmas
H. Zhang, M. Hoelzl, I. Krebs +12
Flux pumping was achieved in recent hybrid scenario experiments in the ASDEX Upgrade (AUG) tokamak, which is characterized by a sawtooth-free helical quiescent state and the anomal…
A comparison of low-n Mercier unstable Wendelstein stellarators and quasi-interchange modes in tokamaks
Rohan Ramasamy, Haowei Zhang, Joachim Geiger +5
Mercier's criterion is typically enforced as a hard operational limit in stellarator design. At the same time, past experimental and numerical studies have shown that this limit ma…
Quantitative Magnetohydrodynamic Modelling of Flux Pumping in ASDEX Upgrade
Haowei Zhang, Matthias Hölzl, Isabel Krebs +9
The sawtooth-free hybrid scenario has been achieved recently in ASDEX Upgrade (AUG) with applied non-inductive current sources and auxiliary heating [A. Burckhart et al 2023 Nucl.…
Characteristics of the Alfvénic activity during the current quench in ASDEX Upgrade
P. Heinrich, G. Papp, Ph. Lauber +7
ASDEX Upgrade has developed multiple massive gas injection (MGI) scenarios to investigate runaway electron (RE) dynamics. During the current quench of the MGI induced disruptions,…
Numerical study of tearing mode seeding in tokamak X-point plasma
Dmytro Meshcheriakov, Matthias Hoelzl, Valentin Igochine +11
A detailed understanding of island seeding is crucial to avoid (N)TMs and their negative consequences like confinement degradation and disruptions. In the present work, we investig…
Three dimensional boundary displacement due to stable ideal kink modes excited by external n=2 magnetic perturbations
M. Willensdorfer, E. Strumberger, W. Suttrop +15
In low-collisionality scenarios exhibiting mitigation of edge localized modes (ELMs), stable ideal kink modes at the edge are excited by externally applied magnetic perturbation (M…
Experimental investigation of the radial structure of energetic particle driven modes
L. Horvath, G. Papp, Ph. Lauber +8
Alfvén eigenmodes (AEs) and energetic particle modes (EPMs) are often excited by energetic particles (EPs) in tokamak plasmas. One of the main open questions concerning EP driven i…
Sawtooth control using electron cyclotron current drive in the presence of energetic particles in high performance ASDEX Upgrade plasmas
I T Chapman, V Igochine, M Maraschek +4
Sawtooth control using steerable electron cyclotron current drive (ECCD) has been demonstrated in ASDEX Upgrade plasmas with a significant population of energetic ions in the plasm…
Power requirements for electron cyclotron current drive and ion cyclotron resonance heating for sawtooth control in ITER
I. T. Chapman, J. P. Graves, O. Sauter +11
13MW of electron cyclotron current drive (ECCD) power deposited inside the q = 1 surface is likely to reduce the sawtooth period in ITER baseline scenario below the level empirical…
Solitary magnetic perturbations at the ELM onset
RP Wenninger, H Zohm, JE Boom +19
Edge localised modes (ELMs) allow maintaining sufficient purity of tokamak H-mode plasmas and thus enable stationary H-mode. On the other hand in a future device ELMs may cause div…