Overview of first Wendelstein 7-X high-performance operation

T Klinger, T Andreeva, S Bozhenkov, C Brandt… - Nuclear …, 2019 - iopscience.iop.org
The optimized superconducting stellarator device Wendelstein 7-X (with major radius, minor
radius, and plasma volume) restarted operation after the assembly of a graphite heat shield …

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

RC Wolf, A Alonso, S Äkäslompolo, J Baldzuhn… - Physics of …, 2019 - pubs.aip.org
Wendelstein 7-X is the first comprehensively optimized stellarator aiming at good
confinement with plasma parameters relevant to a future stellarator power plant. Plasma …

High-performance plasmas after pellet injections in Wendelstein 7-X

SA Bozhenkov, Y Kazakov, OP Ford… - Nuclear …, 2020 - iopscience.iop.org
A significant improvement of plasma parameters in the optimized stellarator W7-X is found
after injections of frozen hydrogen pellets. The ion temperature in the post-pellet phase …

Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X

HS Bosch, RC Wolf, T Andreeva, J Baldzuhn… - Nuclear …, 2013 - iopscience.iop.org
The next step in the Wendelstein stellarator line is the large superconducting device
Wendelstein 7-X, currently under construction in Greifswald, Germany. Steady-state …

Fast particle confinement with optimized coil currents in the W7-X stellarator

M Drevlak, J Geiger, P Helander, Y Turkin - Nuclear Fusion, 2014 - iopscience.iop.org
One of the principal goals of the W7-X stellarator is to demonstrate good confinement of
energetic ions at finite β. This confinement, however, is sensitive to the magnetic field …

Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies

RC Wolf, S Bozhenkov, A Dinklage… - Plasma Physics and …, 2018 - iopscience.iop.org
For stellarators, which need no or only small amounts of current drive, electron-cyclotron-
resonance heating (ECRH) is a promising heating method even for the envisaged …

Wendelstein 7-X on the path to long-pulse high-performance operation

M Endler, J Baldzuhn, CD Beidler, HS Bosch… - Fusion Engineering and …, 2021 - Elsevier
The Wendelstein 7-X project is aimed at demonstrating that an optimised stellarator is an
attractive candidate for a fusion reactor. This requires the achievement of a number of …

Solid state generator for powerful radio frequency ion sources in neutral beam injection systems

W Kraus, U Fantz, B Heinemann, P Franzen - Fusion Engineering and …, 2015 - Elsevier
Radio frequency ion sources used in neutral beam injection systems (NBI) of fusion
machines are currently supplied by self-excited RF generators. These generators have both …

Investigation of the neoclassical ambipolar electric field in ion-root plasmas on W7-X

N Pablant, A Langenberg, A Alonso, J Baldzuhn… - Nuclear …, 2020 - iopscience.iop.org
The role of the radial electric field in high-performance ion-root plasmas on Wendelstein 7-X
(W7-X) is examined and compared with neoclassical predictions. The W7-X stellarator is the …

[HTML][HTML] Performance of the first neutral beam injector at the Wendelstein 7-X stellarator

A Spanier, D Hartmann, S Äkäslompolo, O Ford… - Fusion Engineering and …, 2021 - Elsevier
The neutral beam injection (NBI) system at Wendelstein 7-X (W7-X) was operated for the first
time in 2018. Detailed calorimetric measurements were carried out to accurately determine …