Results 71 to 80 of about 330 (178)

Magnetic geometry effects on turbulent density fluctuations in Wendelstein 7-X

Nuclear Fusion
Line-integrated density fluctuation measurements from the core of the optimised stellarator Wendelstein 7-X (W7-X) are studied in the context of magnetic field geometry changes.
J.-P. Bähner, L. Podavini, A. Bañón Navarro, M. Porkolab, S.K. Hansen, E.M. Edlund, A. von Stechow, S.A. Bozhenkov, O.P. Ford, G. Fuchert, F. Jenko, A. Langenberg, N.A. Pablant, E. Pasch, P.Zs. Pölöskei, T. Romba, A. Zocco, O. Grulke, the W7-X Team   +18 more
doaj   +1 more source

Publisher Correction: Demonstration of reduced neoclassical energy transport in Wendelstein 7-X. [PDF]

Nature, 2021
Beidler CD, Smith HM, Alonso A, Andreeva T, Baldzuhn J, Beurskens MNA, Borchardt M, Bozhenkov SA, Brunner KJ, Damm H, Drevlak M, Ford OP, Fuchert G, Geiger J, Helander P, Hergenhahn U, Hirsch M, Höfel U, Kazakov YO, Kleiber R, Krychowiak M, Kwak S, Langenberg A, Laqua HP, Neuner U, Pablant NA, Pasch E, Pavone A, Pedersen TS, Rahbarnia K, Schilling J, Scott ER, Stange T, Svensson J, Thomsen H, Turkin Y, Warmer F, Wolf RC, Zhang D, W7-X Team.   +39 more
europepmc   +1 more source

Core plasma fueling by fast inward particle transport after hydrogen pellet injection in Wendelstein 7-X

Nuclear Fusion
A large database of more than 1000 individual cryogenic hydrogen pellets injected into Wendelstein 7-X for plasma fueling was analyzed to improve the understanding of the three phases of the process: the ablation, deposition and transport of the pellet ...
H. Damm, J. Baldzuhn, R.C. Wolf, T.S. Petersen, J. Schilling, N. Panadero, S.A. Bozhenkov, C. Brandt, K.J. Brunner, G. Fuchert, J. Knauer, A. Langenberg, S. Kwak, N.A. Pablant, E. Pasch, H. Thomsen, the W7-X Team   +16 more
doaj   +1 more source

Visible core spectroscopy at Wendelstein 7-X

Review of Scientific Instruments
This paper presents an overview of recent hardware extensions and data analysis developments to the Wendelstein 7-X visible core spectroscopy systems. These include upgrades to prepare the in-vessel components for long-pulse operation, nine additional spectrometers, a new line of sight array for passive spectroscopy, and a coherence imaging charge ...
W7-X Team, Ford, O. P., Langenberg, A., Romba, T., Pölöskei, P., Zanini, M., Bannmann, S., Gonda, T., Ida, K., Lopez Cansino, R., Pablant, N., De La Riva Villen, J., Swee, C., Yoshinuma, M., Alonso, A., Geiger, B., Perseo, V., Viezzer, E.   +17 more
openaire   +6 more sources

Heat and particle exhaust in high-performance plasmas in Wendelstein 7-X

Nuclear Fusion
The paper reports for the first time the heat and particle exhaust at the plasma boundary through various edge diagnostics for the high-performance plasma obtained after pellet injection on Wendelstein 7-X.
Yu Gao, Joachim Geiger, Marcin W. Jakubowski, Arun Pandey, Sergey Bozhenkov, Yuhe Feng, Michael Endler, Jürgen Baldzuhn, Valeria Perseo, Thierry Kremeyer, Georg Schlisio, Aleix Puig Sitjes, Matthias Otte, Dirk Naujoks, Maciej Krychowiak, Ralf König, Daihong Zhang, Tamás Szepesi, Gábor Kocsis, Gábor Cseh, Attila Buzás, Fabio Pisano, Alexander Knieps, the W7-X Team   +23 more
doaj   +1 more source

Experimental investigation of the ECRH stray radiation during the start-up phase in Wendelstein 7-X

EPJ Web of Conferences, 2017
Electron cyclotron resonance heating (ECRH) is the main heating mechanism in the Wendelstein 7-X stellarator (W7-X). W7-X is equipped with five absolutely calibrated sniffer probes that are installed in each of the five modules of the device. The sniffer
Moseev Dmitry, Laqua Heinrich, Marsen Stefan, Stange Torsten, Braune Harald, Erckmann Volker, Gellert Florian, Oosterbeek Johann Wilhelm, Wenzel Uwe   +8 more
doaj   +1 more source

A neural network-based method for input parameter optimization of edge transport modeling utilizing experimental diagnostics

Nuclear Fusion
A neural network-based method is developed to fast optimize EMC3-EIRENE input parameters, enabling EMC3-EIRENE to produce synthetic data that closely match experimental measurements on Wendelstein 7-X.
Y. Luo, S. Xu, Y. Liang, E. Wang, J. Cai, Y. Feng, D. Reiter, A. Knieps, S. Brezinsek, D. Harting, M. Krychowiak, D. Gradic, P. Ren, D. Zhang, Y. Gao, G. Fuchert, A. Pandey, M. Jakubowski, the W7-X Team   +18 more
doaj   +1 more source

Modelling of ICRH slow wave propagation and absorption in Wendelstein 7-X stellarator

Nuclear Fusion
The propagation and absorption of the slow waves (SWs) in the three-ion plasma of the Wendelstein 7-X stellarator have been investigated by ray tracing.
D. Grekov, C. Albert, Yu. Turkin, Yu. Volkova   +3 more
doaj   +1 more source

First experimental observation of zonal flows in the optimized stellarator Wendelstein 7-X

Physical Review Research
In this work, we present the first experimental evidence of the presence of zonal flow (ZF) structures in the optimized stellarator Wendelstein 7-X.
D. Carralero, T. Estrada, J. M. García-Regaña, E. Sánchez, T. Windisch, A. Alonso, E. Maragkoudakis, C. Brandt, K. J. Brunner, C. Gallego-Castillo, P. Kornejew, K. Parks, K. Rahbarnia, H. Thienpondt   +13 more
doaj   +1 more source

Impurity leakage mechanisms in the Wendelstein 7-X island divertor under friction-dominated conditions

Nuclear Fusion
The EMC3-Eirene code was used to study the main impurity leakage mechanism for the island divertor in the standard magnetic field configuration. It was found that under experimentally accessible plasma scenarios in the last experimental campaign, the ...
V.R. Winters, F. Reimold, Y. Feng, V. Perseo, M. Beurskens, S. Bozhenkov, K.J. Brunner, G. Fuchert, R. Koenig, J. Knauer, M. Krychowiak, E. Pasch, E. Scott, D. Zhang, the W7-X Team   +14 more
doaj   +1 more source