Results 21 to 30 of about 3,977 (219)

Tungsten based divertor development for Wendelstein 7-X

Nuclear Materials and Energy, 2023
Wendelstein 7-X, the world’s largest superconducting stellarator in Greifswald (Germany), started plasma experiments with a water-cooled plasma-facing wall in 2022, allowing for long pulse operation. In parallel, a project was launched in 2021 to develop
Joris Fellinger, M. Richou, G. Ehrke, M. Endler, F. Kunkel, D. Naujoks, Th. Kremeyer, A. Menzel-Barbara, Th. Sieber, J-F. Lobsien, R. Neu, J. Tretter, Z. Wang, J-H. You, H. Greuner, K. Hunger, P. Junghanns, O. Schneider, M. Wirtz, Th. Loewenhoff, A. Houben, A. Litnovsky, P-E. Fraysinnes, P. Emonot, S. Roccella, O. Widlund, B. Končar, M. Tekavčič   +27 more
doaj   +1 more source

Quantitative comparison of impurity transport in turbulence reduced and enhanced scenarios at Wendelstein 7-X

Nuclear Fusion, 2023
We assess the turbulent particle transport being responsible for the limitation of the confinement and, thus, the overall performance of the neoclassically optimized stellarator Wendelstein 7-X.
J.A. Alcusón, Th. Wegner, A. Dinklage, A. Langenberg, J.-P. Bähner, B. Buttenschön, E.M. Edlund, G. Fuchert, J.M. García-Regaña, O. Grulke, Z. Huang, M. Porkolab, A.V. Stechow, P. Xanthopoulos, A. Zocco, the W7-X Team   +15 more
doaj   +1 more source

On the interaction between the island divertor heat fluxes, the scrape-off layer radial electric field and the edge turbulence in Wendelstein 7-X plasmas

Nuclear Fusion, 2022
The formation of the radial electric field, $E_\textrm{r}$ in the scrape-off layer (SOL) has been experimentally studied for attached divertor conditions in stellarator W7-X.
E. Maragkoudakis, D. Carralero, T. Estrada, T. Windisch, Y. Gao, C. Killer, M. Jakubowski, A. Puig Sitjes, F. Pisano, H. Sándor, M. Vecsei, S. Zoletnik, A. Cappa, the W7-X Team   +13 more
doaj   +1 more source

Uncertainty quantification in three‐dimensional magnetohydrodynamic equilibrium reconstruction via surrogate‐assisted Bayesian inference

Contributions to Plasma Physics, Volume 63, Issue 5-6, June-July 2023., 2023
Abstract In three‐dimensional (3D) equilibrium, reconstruction defining parameters of an ideal magneto‐hydrodynamic equilibrium are inferred from a set of plasma diagnostic measurements. For the reconstructed parameters, various forms of uncertainty estimates exist within common 3D reconstruction frameworks.
Robert Köberl, Udo von Toussaint, Hans‐Joachim Bungartz, Jonathan Schilling, Christopher G. Albert, W7‐X Team   +5 more
wiley   +1 more source

Configuration Management for Wendelstein 7-X [PDF]

Fusion Engineering and Design, 2009
A complex system like the large superconducting Wendelstein 7-X stellarator necessitates a dedicated organizational structure which assures permanent consistency between the requirements of its system specification and the performance attributes of all its components throughout its life time.
Brakel, R., van Eeten, P., Hartmann, D. A., Henkelmann, K., Knauer, J., Müller, K., Okkenga-Wolf, A., Wenzel, U.   +7 more
openaire   +3 more sources

Hydrogen content in divertor baffle tiles in Wendelstein 7-X

Nuclear Materials and Energy, 2021
Plasma–wall interactions play a crucial role for the performance of fusion devices and the lifetime of plasma-facing components. In this work the results of some plasma–wall interaction processes, namely the erosion/deposition pattern and the fuel ...
Jannis Oelmann, Erik Wüst, Sebastijan Brezinsek, Cong Li, Dongye Zhao, Marcin Rasinski, Chandra Prakash Dhard, Matej Mayer, Dirk Naujoks, Yu Gao   +9 more
doaj   +1 more source

Translation model for anterior segment tomographic data to corneal spherical aberration derived from a Monte‐Carlo simulation based on raytracing

Acta Ophthalmologica, Volume 100, Issue 8, Page e1665-e1674, December 2022., 2022
Abstract Background Intraocular lenses with a negative aspherical design for correction of corneal spherical aberration (SA) have gained popularity in recent decades. In most cases, a ‘one size fits all’ concept is followed, where all eyes receive lenses with the same SA correction. The purpose of this study is to develop a strategy based on raytracing
Achim Langenbucher, Nóra Szentmáry, Alan Cayless, Lena Münninghoff, Rosalie Wortmann, Jascha Wendelstein, Peter Hoffmann   +6 more
wiley   +1 more source

Prediction of CW chord as a measure for the eye’s orientation axis after cataract surgery from preoperative IOLMaster 700 measurement data

Acta Ophthalmologica, Volume 100, Issue 6, Page e1232-e1239, September 2022., 2022
Abstract Background The angles alpha and kappa are widely discussed for centring refractive procedures, but they cannot be determined with ophthalmic instruments. The purpose of this study is to investigate the Chang‐Waring chord (position of the Purkinje reflex PI relative to the corneal centre) derived from an optical biometer before and after ...
Achim Langenbucher, Nóra Szentmáry, Alan Cayless, Johannes Weisensee, Jascha Wendelstein, Peter Hoffmann   +5 more
wiley   +1 more source

Implementation and validation of guiding centre approximation into ERO2.0

Contributions to Plasma Physics, Volume 62, Issue 5-6, June‐July 2022., 2022
Abstract The Monte‐Carlo code ERO2.0 uses full orbit resolution to follow impurity particles throughout the plasma volume to determine the local erosion and deposition fluxes on the plasma‐facing components of fusion devices in magnetic confinement fusion.
Sebastian Rode, Juri Romazanov, Dirk Reiser, Sebastijan Brezinsek, Christian Linsmeier, Alexander Pukhov   +5 more
wiley   +1 more source

ECE Diagnostic for the initial Operation of Wendelstein 7-X [PDF]

EPJ Web of Conferences, 2019
The ECE diagnostic at W7-X in its standard mode of operation measures in X2 mode polarization with a 32 channel radiometer in the frequency band around 140 GHz for central magnetic field 2.5T.
Hirsch Matthias, Höfel Udo, Oosterbeek Johan Willem, Chaudhary Neha, Geiger Joachim, Hartfuss Hans-Jürgen, Kasparek Walter, Marushchenko Nikolai, van Milligen Boudewijn, Plaum Burkhard, Stange Torsten, Svensson Jakob, Tsuchiya Hayato, Wagner Dietmar, McWeir Gavin, Wolf Robert   +15 more
doaj   +1 more source