Results 81 to 90 of about 6,348 (198)

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

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

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

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   +5 more sources

Characterization and correction of charge-induced pixel shifts in DECam

, 2015
Interaction of charges in CCDs with the already accumulated charge distribution causes both a flux dependence of the point-spread function (an increase of observed size with flux, also known as the brighter/fatter effect) and pixel-to-pixel correlations ...
Bernstein, Gary M., Gruen, Daniel, Jarvis, Mike, Plazas, Andrés A., Rowe, Barnaby, Seitz, Stella, Vikram, Vinu   +6 more
core   +1 more source

Analysis of full disc Ca II K spectroheliograms. II. Towards an accurate assessment of long-term variations in plage areas

, 2019
Reconstructions of past irradiance variations require suitable data on solar activity. The longest direct proxy is the sunspot number, and it has been most widely employed for this purpose.
Chatzistergos, Theodosios, Ermolli, Ilaria, Krivova, Natalie A., Solanki, Sami K.   +3 more
core   +1 more source

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