Achieving stationary high performance plasmas at Wendelstein 7-X

A. Langenberg*, F. Warmer, G. Fuchert, O. Ford, S. Bozhenkov, T. Andreeva, S. Lazerson, N. A. Pablant, T. Gonda, M. N.A. Beurskens, K. J. Brunner, B. Buttenschön, A. Dinklage, D. Hartmann, J. Knauer, O. Marchuk, E. Pasch, F. Reimold, T. Stange, Th WegnerO. Grulke, R. C. Wolf

*Corresponding author for this work

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Abstract

This work reports on recent results on the search for high performance plasma scenarios at the magnetically confined stellarator fusion device Wendelstein 7-X. In four new designed scenarios, the development from transient toward stationary plasmas of improved performance has been realized. In particular, a high performance duration of up to 5 s, an energy confinement time of 0.3 s, a diamagnetic energy of 1.1 MJ, a central ion temperature of 2.2 keV, and a fusion triple product of 3.4 × 10 19 m − 3 · keV · s have been achieved, and previously observed limitations of the machine have been overcome, regarding both the performance and its duration. The two main experimental techniques for stationary high performance are neutral beam injection core fueling on the one hand and the use of a magnetic field configuration with internal islands on the other hand. Two of the developed scenarios are expected to be extendable straightforward toward a duration of several tens of seconds, making use of the long pulse operation capabilities of W7-X.

Original languageEnglish
Article number052502
JournalPhysics of Plasmas
Volume31
Issue number5
Number of pages8
ISSN1070-664X
DOIs
Publication statusPublished - 2024

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