Results 21 to 30 of about 6,348 (198)

Overdense plasma heating in Wendelstein 7-X(W7-X) stellarator

Results in Physics, 2017
High yield nuclear fusion operating in tokamak and stellarator need to heat plasma up to the required temperatures. As the confined plasma is overdensed, the electron cyclotron resonance heating (ECRH) is inefficient due to cut-off layer.
S. Adlparvar, S. Miraboutalebi, S.M. Sadat Kiai, L. Rajaee   +3 more
doaj   +1 more source

Corrigendum: Gas exhaust in the Wendelstein 7-X stellarator during the first divertor operation (2022 Nucl. Fusion 62 096016)

Nuclear Fusion, 2023
In the published paper titled ‘Gas exhaust in the Wendelstein 7-X stellarator during the first divertor operation’ (2022 Nucl. Fusion   https://doi.org/10.1088/1741-4326/ac7ac4 ), figure 8 was incorrect. This corrigendum provides the correct figure 8 .
U. Wenzel, G. Schlisio, P. Drewelow, M. Krychowiak, R. König, T.S. Pedersen, S. Bozhenkov, V. Haak, A.K. Kharwandikar, S. Lazerson, D. Naujoks, V. Perseo, V. Winters   +12 more
doaj   +1 more source

Collisionless microinstabilities in stellarators II - numerical simulations [PDF]

, 2013
Microinstabilities exhibit a rich variety of behavior in stellarators due to the many degrees of freedom in the magnetic geometry. It has recently been found that certain stellarators (quasi-isodynamic ones with maximum-$J$ geometry) are partly resilient
Helander, P., Proll, J. H. E., Xanthopoulos, P.   +2 more
core   +1 more source

ICRH simulations for the Wendelstein 7-X stellarator [PDF]

EPJ Web of Conferences
We present the current status of ion-cyclotron-resonance heating (ICRH) simulations for Wendelstein 7-X (W7-X), a large, superconducting, optimized stellarator in Greifswald, Germany.
Slaby Christoph, Smith Håkan M., Graves Jonathan P., Lazerson Samuel A.   +3 more
doaj   +1 more source

Gyro orbit simulations of neutral beam injection in Wendelstein 7-X

Nuclear Fusion, 2023
Simulations exploring neutral beam operation in Wendelstein 7-X (W7-X) at reduced magnetic field are performed using a newly implemented gyro orbit model in the BEAMS3D code.
Samuel A. Lazerson, David Kulla, Dirk A. Hartmann, Paul McNeely, Norbert Rust, the W7-X Team   +5 more
doaj   +1 more source

Depth resolved analysis of hydrogen in W7-X graphite components using laser-induced ablation-quadrupole mass spectrometry (LIA-QMS)

Nuclear Materials and Energy, 2019
A deep understanding of the plasma-wall interaction processes in fusion devices like Wendelstein 7-X is necessary for an efficient plasma operation and a long lifetime of the plasma-facing components.In this work we present an approach employing residual
Jannis Oelmann, Cong Li, Sebastijan Brezinsek, Marcin Rasinski, Chandra Prakash Dhard, Ralf König, Victoria Winters, Christian Linsmeier   +7 more
doaj   +1 more source

Detecting Plasma Detachment in the Wendelstein 7-X Stellarator Using Machine Learning

Applied Sciences, 2021
The detachment regime has a high potential to play an important role in fusion devices on the road to a fusion power plant. Complete power detachment has been observed several times during the experimental campaigns of the Wendelstein 7-X (W7-X ...
Máté Szűcs, Tamás Szepesi, Christoph Biedermann, Gábor Cseh, Marcin Jakubowski, Gábor Kocsis, Ralf König, Marco Krause, Valeria Perseo, Aleix Puig Sitjes, The Team W7-X   +10 more
doaj   +1 more source

The importance of the classical channel in the impurity transport of optimized stellarators [PDF]

, 2019
In toroidal magnetic confinement devices, such as tokamaks and stellarators, neoclassical transport is usually an order of magnitude larger than its classical counterpart.
Buller, S., Mollén, A., Newton, S. L., Pusztai, I., Smith, H. M.   +4 more
core   +2 more sources

Physics-regularized neural network of the ideal-MHD solution operator in Wendelstein 7-X configurations

Nuclear Fusion, 2023
The computational cost of constructing 3D magnetohydrodynamic (MHD) equilibria is one of the limiting factors in stellarator research and design. Although data-driven approaches have been proposed to provide fast 3D MHD equilibria, the accuracy with ...
Andrea Merlo, Daniel Böckenhoff, Jonathan Schilling, Samuel Aaron Lazerson, Thomas Sunn Pedersen, the W7-X Team   +5 more
doaj   +1 more source

Reflectometry for Wendelstein 7-X [PDF]

Nuclear Fusion, 2006
Diagnostic equipment for the fully optimized stellarator Wendelstein 7-X involves a reflectometry system dedicated to measuring edge density profiles and characterizing density perturbations and their poloidal propagation velocity. Preparatory work such as design activities and the installation of a first antenna pair belongs to the so-called start-up ...
Hirsch, M., Holzhauer, E., Hartfuss, H.
openaire   +3 more sources