Results 21 to 30 of about 3,273,570 (352)

Multiscale interaction between a large scale magnetic island and small scale turbulence [PDF]

, 2017
Multiscale interaction between the magnetic island and turbulence has been demonstrated through simultaneous two-dimensional measurements of turbulence and temperature and flow profiles.
M. J. Choi, J. Kim, J. Kwon, H. K. Park, Y. In, W. Lee, K. D. Lee, G. Yun, J. Lee, M. Kim, W. Ko, J. Lee, Y. S. Park, Y. Na, N. C. Luhmann, B. H. P. N. F. R. Institute, Ulsan National Institute of Science, Technology, Pohang University of Science, Columbia University, Seoul National University, U. C. Davis   +21 more
semanticscholar   +1 more source

Validation of density pump-out by pedestal-foot magnetic island formation prior to ELM suppression in KSTAR and DIII-D tokamaks

Nuclear Fusion, 2023
TM1 nonlinear two-fluid simulations reveal key characteristics of density pump-out caused by pedestal-foot island formation when applying resonant magnetic perturbation (RMP).
Q.M. Hu, J.-K. Park, S.M. Yang, S.K. Kim, N.C. Logan, R. Nazikian, J. Kang, C. Paz-Soldan, W.H. Ko, G.Y. Park   +9 more
doaj   +1 more source

Self-generated vortex flows in a tokamak magnetic island with a background flow

Nuclear Fusion, 2023
We present a gyrokinetic theory of self-generated E × B vortex flows in a magnetic island in a collisionless tokamak plasma with a background vortex flow.
G.J. Choi
doaj   +1 more source

On-Load Analytical Modeling of Slotted Interior Magnet Synchronous Machines Using Magnetic Islands Method

IEEE Access, 2020
In general, the Magnetic Circuit (MC) is an effective and valuable tool for calculating the PM flux and predicting machine behavior during the no-load operation.
Mohammadreza Mostafavi Ghahfarokhi, Ebrahim Amiri, Samad Taghipour Boroujeni, Aliakbar Damaki Aliabad   +3 more
doaj   +1 more source

Coalescence instability of magnetic islands [PDF]

The Physics of Fluids, 1976
The stability of a periodic magnetic island structure was studied using the ideal MHD equations. An instability is found which describes the tendency toward coalescence of parallel currents in the neighboring islands. It is expected that this instability will proceed at a fast MHD rate as long as the forces driving the instability can overcome the ...
Finn, J. M., Kaw, P. K.
openaire   +3 more sources

Global gyrokinetic simulation of microturbulence with kinetic electrons in the presence of magnetic island in tokamak

Physics of Plasmas, 2019
An electrostatic model has been formulated and implemented in the gyrokinetic toroidal code to study the nonlinear ion temperature gradient (ITG) turbulence in the presence of an n = 1, m = 2 magnetic island.
K. Fang, Zhihong Lin
semanticscholar   +1 more source

Coalescence of Magnetic Islands

The Physics of Fluids, 1979
A detailed numerical analysis has been conducted of the instability described by Finn and Kaw in which parallel currents in neighboring islands tend to coalesce into larger units. The existence of this coalescence instability in the ideal magnetohydrodynamic limit is confirmed, but no evidence is found for a threshold in island width. The linear growth
Biskamp, D., Welter, H.
openaire   +4 more sources

Drift kinetic theory of neoclassical tearing modes in tokamak plasmas: polarisation current and its effect on magnetic island threshold physics

Nuclear Fusion, 2023
A nonlinear 4-dimensional drift island theory derived in (Imada et al 2019 Nucl. Fusion 59 046016 and references therein) provides qualitative predictions of the plasma response to a stationary neoclassical tearing mode (NTM) magnetic island in a low ...
A.V. Dudkovskaia, J.W. Connor, D. Dickinson, P. Hill, K. Imada, S. Leigh, H.R. Wilson   +6 more
doaj   +1 more source

Radial localization of electron temperature pedestal and ELM-like events using ECE measurements at Wendelstein 7-X [PDF]

EPJ Web of Conferences, 2023
A magnetic configuration scan was performed at Wendelstein 7-X stellarator by varying the rotational transform to analyze the plasma confinement for magnetic configurations with different edge magnetic island locations and sizes.
Chaudhary N., Hirsch M., Andreeva T., Geiger J., Hoefel U., Rahbarnia K., Wurden G. A., Wolf R. C.   +7 more
doaj   +1 more source

The onset distribution of rotating tearing modes and its consequences on the stability of high-confinement-mode plasmas in DIII-D

Nuclear Fusion, 2023
Analysis of a multi-scenario database of over 13 000 DIII-D H-mode discharges shows that the $m,n = 2,1$ magnetic islands are dominantly pressure gradient driven, stochastically triggered non-linear instabilities at all edge safety factor ( $q_\text{95}$
L. Bardóczi, N.J. Richner, N.C. Logan
doaj   +1 more source