Results 61 to 70 of about 330 (178)

Validation of a synthetic fast ion loss detector model for Wendelstein 7-X

Nuclear Fusion
We present the first validated synthetic diagnostic for fast ion loss detectors (FILDs) in the Wendelstein 7-X (W7-X) stellarator. This model has been developed on, and validated against experimental data from, a FILD provided by the National Institute ...
A. LeViness, S.A. Lazerson, A. Jansen van Vuuren, J. Rueda-Rueda, M. Beurskens, S. Bozhenkov, K.J. Brunner, O.P. Ford, G. Fuchert, M. Garcìa-Muñoz, M. Isobe, C. Killer, J. Knauer, K. Ogawa, N. Pablant, E. Pasch, P. Poloskei, T. Romba, the W7-X Team   +18 more
doaj   +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

Broadband Alfvénic excitation correlated to turbulence level in the Wendelstein 7-X stellarator plasmas

Nuclear Fusion, 2023
During the first operational phase (OP1) of the Wendelstein 7-X (W7-X) stellarator, poloidal magnetic field fluctuations, $\dot{B}_{\theta}$ , were measured in several different plasma scenarios with a system of Mirnov coils.
S. Vaz Mendes, K. Rahbarnia, C. Slaby, H. Thomsen, J. Schilling, M. Borchardt, R. Kleiber, A. Könies, J.-P. Bähner, A. von Stechow, T. Sunn Pedersen, T. Klinger, the W7-X Team   +12 more
doaj   +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

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

Concurrent operation of 10 gyrotrons at W7-X experience and improvement opportunities

EPJ Web of Conferences, 2018
At the stellarator Wendelstein 7-X (W7-X) Electron Cyclotron Resonance Heating (ECRH) is the main heating system for steady-state operation and was the only available heating system during the operation phase OP1.2a in 2017.
Braune H., Brunner K.J., Laqua H.P., Marsen S., Moseev D., Noke F., Purps F., Schneider N., Schulz T., Stange T., Uhren P., Wilde F.   +11 more
doaj   +1 more source

In-vessel inspection of arc traces on the W7-X plasma facing components after the operation phase OP2.1

Nuclear Materials and Energy
Updated distribution of arc traces across the interior walls after the operation phase 2.1 of Wendelstein 7-X (W7-X) is reported. A total of 105 new arc places were found, with 95% of them located around the stainless steel panels, diagnostic ports, and ...
D. Hwangbo, C.P. Dhard, S. Kajita, D. Naujoks, Y. Gao   +4 more
doaj   +1 more source

Impact of spatially varying transport coefficients in EMC3-Eirene simulations of W7-X and assessment of drifts

Nuclear Fusion
Modelling the scrape-off layer of a stellarator is challenging due to the complex magnetic 3D geometry. The here presented study analyses simulations of the scrape-off layer (SOL) of the stellarator Wendelstein 7-X (W7-X) using spatially varying ...
David Bold, Felix Reimold, Holger Niemann, Yu Gao, Marcin Jakubowski, Carsten Killer, Victoria R. Winters, Nassim Maaziz, the W7-X Team   +8 more
doaj   +1 more source

In-vessel colorimetry of Wendelstein 7-X first wall components after OP2.1

Nuclear Materials and Energy
Colorimetry has been continuously utilized for the estimation of deposition layer distribution on the first wall panels and divertor target elements in each Operation Phases (OP) of Wendelstein 7-X (W7-X).
G. Motojima, S. Masuzaki, C.P. Dhard, D. Naujoks, Mattis Hänel, Yu Gao   +5 more
doaj   +1 more source

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