Results 71 to 80 of about 3,977 (219)

Study on resonant electron cyclotron heating by OSXB double mode conversion at the W7-X stellarator

Nuclear Engineering and Technology, 2018
Electromagnetic waves potentially have been used to heat overdense nuclear fusion plasmas through a double mode conversion from ordinary to slow extraordinary and finally to Electron Bernstein Wave (EBW) modes, OSXB.
S. Adlparvar, S. Miraboutalebi, S.M. Sadat Kiai, L. Rajaee   +3 more
doaj   +1 more source

Evaluating keratometry and corneal astigmatism data from biometers and anterior segment tomographers and mapping to reconstructed corneal astigmatism

Clinical &Experimental Ophthalmology, Volume 52, Issue 6, Page 627-638, August 2024.
Abstract Background To compare results from different corneal astigmatism measurement instruments; to reconstruct corneal astigmatism from the postimplantation spectacle refraction and toric intraocular lens (IOL) power; and to derive models for mapping measured corneal astigmatism to reconstructed corneal astigmatism.
Achim Langenbucher, Leonardo Taroni, Catarina P. Coutinho, Alan Cayless, Nóra Szentmáry, Peter Hoffmann, Jascha Wendelstein, Giacomo Savini   +7 more
wiley   +1 more source

Global gyrokinetic analysis of Wendelstein 7-X discharge: unveiling the importance of trapped-electron-mode and electron-temperature-gradient turbulence

Nuclear Fusion
We present the first nonlinear, gyrokinetic, radially global simulation of a discharge of the Wendelstein 7-X-like stellarator, including kinetic electrons, an equilibrium radial electric field, as well as electromagnetic and collisional effects.
Felix Wilms, Alejandro Bañón Navarro, Thomas Windisch, Sergey Bozhenkov, Felix Warmer, Golo Fuchert, Oliver Ford, Daihong Zhang, Torsten Stange, Frank Jenko, the W7-X Team   +10 more
doaj   +1 more source

Impact of impurities on the effective charge state distribution in the limiter plasmas of Wendelstein 7-X

Nuclear Materials and Energy, 2019
Carbon and oxygen have been identified as the two major impurities in the first limiter operational phase of the stellarator Wendelstein 7-X. We evaluate basic differences between these impurities regarding the effective charge state in the boundary ...
J. Cosfeld, M. Rack, D. Reiter, P. Drews, Y. Feng, D. Zhang   +5 more
doaj   +1 more source

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

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

Development of a scintillator based fast-ion loss detector for the Wendelstein 7-X stellarator

A new scintillator based fast -ion loss detector (FILD) system has been designed for the Wendelstein 7-X (W7X) stellarator. The mechanical design of the system is presented here along with engineering analyses of the system.
Galdon-Quiroga, J., Hidalgo-Salaverri, J., Leviness, A., Ayllon-Guerola, J., Lazerson, S. A., Pablant, N., Garcia-Dominguez, J., Jansen van Vuuren, Anton, Garcia-Munoz, M., Segado-Fernandez, J., Rueda-Rueda, J.   +10 more
core   +1 more source

Implementation and performance evaluation of the real-time algorithms for Wendelstein 7-X divertor protection system for OP2.1

, 2023
A new Infrared (IR) image analysis system will be deployed for real-time diverror protection during the upcoming Operational Phase (OP) 2.1 in the Wendelstein 7-X (W7-X) stellarator.
Wendelstein 7-X Team, Puig Sitjes, Aleix, Makowski, Dariusz, Gao, Yu, Winter, Axel, Jakubowski, Marcin, Jabłoński, Bartłomiej, Fischer, Simon   +7 more
core   +1 more source