Results 101 to 110 of about 452,681 (253)

First measurements with a Coherence Imaging Charge Exchange Recombination Spectroscopy (CICERS) diagnostic at Wendelstein 7-X

Plasma Physics and Controlled Fusion
In this work, the Coherence Imaging Spectroscopy technique is exploited for active charge exchange radiation measurements to infer high spatial resolution 2D ion temperature ( Ti ) maps in the core region of Wendelstein 7-X plasmas.
R. Lopez-Cansino, V. Perseo, E. Viezzer, D. Kriete, O. Ford, T. Romba, P. Poloskei   +6 more
semanticscholar   +1 more source

Performance of Wendelstein 7-X stellarator plasmas during the first divertor operation phase

Physics of Plasmas, 2019
Wendelstein 7-X is the first comprehensively optimized stellarator aiming at good confinement with plasma parameters relevant to a future stellarator power plant. Plasma operation started in 2015 using a limiter configuration.
R. Wolf, A. Alonso, S. Äkäslompolo, J. Baldzuhn, M. Beurskens, C. Beidler, C. Biedermann, H. Bosch, S. Bozhenkov, R. Brakel, H. Braune, S. Brezinsek, K. Brunner, H. Damm, A. Dinklage, P. Drewelow, F. Effenberg, Y. Feng, O. Ford, G. Fuchert, Y. Gao, J. Geiger, O. Grulke, N. Harder, D. Hartmann, P. Helander, B. Heinemann, M. Hirsch, U. Höfel, C. Hopf, K. Ida, M. Isobe, M. Jakubowski, Y. Kazakov, C. Killer, T. Klinger, J. Knauer, R. König, M. Krychowiak, A. Langenberg, H. Laqua, S. Lazerson, P. McNeely, S. Marsen, N. Marushchenko, R. Nocentini, K. Ogawa, G. Orozco, M. Osakabe, M. Otte, N. Pablant, E. Pasch, A. Pavone, M. Porkolab, A. Puig Sitjes, K. Rahbarnia, R. Riedl, N. Rust, E. Sánchez, E. Scott, J. Schilling, R. Schroeder, T. Stange, A. von Stechow, E. Strumberger, T. Sunn Pedersen, J. Svensson, H. Thomson, Y. Turkin, L. Vanó, T. Wauters, G. Wurden, M. Yoshinuma, M. Zanini, D. Zhang   +74 more
semanticscholar   +1 more source

Bayesian modelling of multiple plasma diagnostics at Wendelstein 7-X

Nuclear Fusion
Inference of electron density and temperature has been performed using multiple, diverse sets of plasma diagnostic data at Wendelstein 7-X. Predictive models for the interferometer, Thomson scattering and helium beam emission spectroscopy (He-BES ...
Sehyun Kwak, U. Hoefel, M. Krychowiak, A. Langenberg, J. Svensson, H. Trimino Mora, Y.-C. Ghim, the W7-X Team   +7 more
doaj   +1 more source

Bayesian inference of electron density and ion temperature profiles from neutral beam and halo Balmer-α emission at Wendelstein 7-X

Plasma Physics and Controlled Fusion
By employing Bayesian inference techniques, the full electron density profile from the plasma core to the edge of Wendelstein 7-X (W7-X) is inferred solely from neutral hydrogen beam and halo Balmer-α (Hα) emission data.
S. Bannmann, O. Ford, U. Höfel, P. Poloskei, A. Pavone, S. Kwak, J. Svensson, S. Lazerson, P. McNeely, N. Rust, D. Hartmann, E. Pasch, G. Fuchert, A. Langenberg, N. Pablant, K. Brunner, R. Wolf   +16 more
semanticscholar   +1 more source

Impurities in a non-axisymmetric plasma: transport and effect on bootstrap current [PDF]

, 2015
Impurities cause radiation losses and plasma dilution, and in stellarator plasmas the neoclassical ambipolar radial electric field is often unfavorable for avoiding strong impurity peaking.
Braun, Stefanie, Helander, Per, Landreman, Matt, Mollén, Albert, Smith, Håkan M.   +4 more
core   +2 more sources

Investigation of a low frequency coherent mode in Wendelstein 7-X with island divertor

Nuclear Fusion, 2023
During the island divertor operation of W7-X, especially in standard magnetic configuration (with 5/5 island chain in the scrape-off-layer (SOL)), quasi-periodic electromagnetic oscillation is observed.
H.M. Xiang, A. Krämer-Flecken, X. Han, T. Windisch, G. Weir, K. Rahbarnia, J. Schilling, H. Thomsen, S.vaz Mendes, A. Knieps, M. Vécsei, M. Otte, S. Zoletnik, G. Anda, D. Dunai, D. Zhang, P. Kornejew, J. Huang, T. Zhang, X.D. Lin, X. Gao, Y. Liang, the W7-X team   +22 more
doaj   +1 more source

Electron-temperature-gradient-driven ion-scale turbulence in high-performance scenarios in Wendelstein 7-X

Physical Review Research
Through intercode gyrokinetic numerical simulations, we predict that, for the conditions met during improved performances in the stellarator Wendelstein 7-X, turbulent transport can be dominated by electron-temperature-gradient-driven ion-scale ...
A. Zocco, L. Podavini, F. Wilms, A. Bañón Navarro, F. Jenko   +4 more
semanticscholar   +1 more source

Impurity transport and bulk ion flow in a mixed collisionality stellarator plasma

, 2017
The accumulation of impurities in the core of magnetically confined plasmas, resulting from standard collisional transport mechanisms, is a known threat to their performance as fusion energy sources.
Helander, Per, Mollén, Albert, Newton, Sarah L., Smith, Håkan M.   +3 more
core   +1 more source

Wall conditioning throughout the first carbon divertor campaign on Wendelstein 7-X

Nuclear Materials and Energy, 2018
Controlling the recycling of hydrogen and the release of impurities from the plasma facing components proved to be essential and challenging throughout the first divertor campaign on W7-X. This paper discusses the conditioning requirements throughout the
Tom Wauters, Andrei Goriaev, Arturo Alonso, Juergen Baldzuhn, Rudolf Brakel, Sebastijan Brezinsek, Andreas Dinklage, Heinz Grote, Joris Fellinger, Oliver P. Ford, Ralf König, Heinrich Laqua, Dmitry Matveev, Torsten Stange, Lilla Vanó   +14 more
doaj   +1 more source

A study of turbulent filaments in the edge plasma of the Wendelstein 7-X stellarator

Nuclear Fusion
Filaments are studied by examining fast camera images on the Wendelstein 7-X stellarator. Fast cameras offer a unique perspective, revealing the complex 3D structure of filaments in the entire poloidal cross-section of the plasma.
A. Buzás, G. Kocsis, C. Biedermann, G. Cseh, T. Szepesi, M. Szűcs   +5 more
semanticscholar   +1 more source