Results 81 to 90 of about 3,977 (219)

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

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

Localized phase contrast imaging at the Wendelstein 7-X stellarator

In its basic form, phase contrast imaging (PCI) provides line-integrated measurements of electron density fluctuations in plasmas. As turbulent fluctuations in magnetically confined plasmas have wave vectors almost perpendicular to the background ...
Stechow, A. von, Wendelstein 7-X Team, Grulke, O., Porkolab, M., Edlund, E. M., Hansen, S. K., Bähner, J.-P.   +6 more
core   +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

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

The construction of the Wendelstein 7-X stellarator

, 2008
This paper reviews the recent progress in the construction and assembly of the large, superconducting stellarator device Wendelstein 7-X in Greifswald, Germany. Technical solutions are discussed as well as the impact on the later physics program.
Klinger, T.
core  

Collective Thomson scattering diagnostic at Wendelstein 7-X [PDF]

, 2019
A Collective Thomson Scattering (CTS) diagnostic is installed at Wendelstein 7-X for ion temperature measurements in the plasma core. The diagnostic utilizes 140 GHz gyrotrons usually used for electron cyclotron resonance heating (ECRH) as a source of ...
Rasmussen, J, Korsholm, SB, S. K. Nielsen, H. P. Laqua, R. C. Wolf, Salewski, Mirko, Moseev, D., Lechte, C., Braune, H, Nielsen, SK, Wolf, R.C., Stange, T, D. Moseev, F. Leipold, Salewski, M, N. Schneider, Stejner, M., Kasparek, W, S. B. Korsholm, Leipold, F, Moseev, D, U. Hoefel, Leipold, Frank, Marsen, S, C. Lechte, Stejner, M, T. Stange, Laqua, H., Schneider, N, M. Stejner, M. Salewski, Nielsen, S., S. Marsen, Marsen, S., Korsholm, S.B., Wolf, RC, Wolf, R. C., H. Braune, J. Rasmussen, Laqua, H.P., Nielsen, S. K., Salewski, M., Laqua, HP, Rasmussen, J., Höfel, Udo, Wolf, R., Hoefel, U., Kasparek, W., I. Abramovic, Stange, T., Korsholm, S., Leipold, F., Schneider, N., M. Weißgerber, W. Kasparek, Weißgerber, M, Nielsen, S.K., Braune, H., Lechte, C, Abramovic, I Ivana, Weißgerber, M., Abramovic, I., Laqua, H. P., Korsholm, Søren Bang   +63 more
core   +1 more source