Achieving stationary high performance plasmas at Wendelstein 7-X

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

doi:10.1063/5.0199958

Title: Achieving stationary high performance plasmas at Wendelstein 7-X

Journal Article · 06 May 2024 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0199958 · OSTI ID:2352457

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Max-Planck-Institut für Plasmaphysik 1, Greifswald (Germany)
Max-Planck-Institut für Plasmaphysik 1, Greifswald (Germany); Eindhoven University of Technology (Netherlands)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung, Jülich (Germany)
Max-Planck-Institut für Plasmaphysik 1, Greifswald (Germany); Technical University of Denmark, Lyngby (Denmark)
Max-Planck-Institut für Plasmaphysik 1, Greifswald (Germany); Technical University of Berlin (Germany)

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 x 10¹⁹ 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.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; European Union

Contributing Organization:: W7-X Team

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2352457

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 31; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

References (34)

First feedback-controlled divertor detachment in W7-X: Experience from TDU operation and prospects for operation with actively cooled divertor Krychowiak, M.; König, R.; Barbui, T. Nuclear Materials and Energy, Vol. 34 https://doi.org/10.1016/j.nme.2023.101363	journal	March 2023
Turbulent impurity transport simulations in Wendelstein 7-X plasmas García-Regaña, J. M.; Barnes, M.; Calvo, I. Journal of Plasma Physics, Vol. 87, Issue 1 https://doi.org/10.1017/S0022377820001543	journal	February 2021
Overview of core impurity transport in the first divertor operation of Wendelstein 7-X Wegner, Th.; Bähner, J. -P.; Buttenschön, B. Journal of Plasma Physics, Vol. 89, Issue 3 https://doi.org/10.1017/S0022377823000417	journal	May 2023
Magnetic configuration effects on the Wendelstein 7-X stellarator Dinklage, A.; Beidler, C. D.; Helander, P. Nature Physics, Vol. 14, Issue 8 https://doi.org/10.1038/s41567-018-0141-9	journal	May 2018
Demonstration of reduced neoclassical energy transport in Wendelstein 7-X Beidler, C. D.; Smith, H. M.; Alonso, A. Nature, Vol. 596, Issue 7871 https://doi.org/10.1038/s41586-021-03687-w	journal	August 2021
The Thomson scattering system at Wendelstein 7-X Pasch, E.; Beurskens, M. N. A.; Bozhenkov, S. A. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4962248	journal	September 2016
Prospects of X-ray imaging spectrometers for impurity transport: Recent results from the stellarator Wendelstein 7-X (invited) Langenberg, A.; Pablant, N. A.; Wegner, Th. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5036536	journal	October 2018
Performance of Wendelstein 7-X stellarator plasmas during the first divertor operation phase Wolf, R. C.; Alonso, A.; Äkäslompolo, S. Physics of Plasmas, Vol. 26, Issue 8 https://doi.org/10.1063/1.5098761	journal	August 2019
Charge-state independent anomalous transport for a wide range of different impurity species observed at Wendelstein 7-X Langenberg, A.; Wegner, Th.; Pablant, N. A. Physics of Plasmas, Vol. 27, Issue 5 https://doi.org/10.1063/5.0004462	journal	May 2020
Correction and verification of x-ray imaging crystal spectrometer analysis on Wendelstein 7-X through x-ray ray tracing Pablant, N. A.; Langenberg, A.; Alonso, J. A. Review of Scientific Instruments, Vol. 92, Issue 4 https://doi.org/10.1063/5.0043513	journal	April 2021
Characterization of injection and confinement improvement through impurity induced profile modifications on the Wendelstein 7-X stellarator Lunsford, R.; Killer, C.; Nagy, A. Physics of Plasmas, Vol. 28, Issue 8 https://doi.org/10.1063/5.0047274	journal	August 2021
Characterization of energy confinement in net-current free plasmas using the extended International Stellarator Database Yamada, H.; Harris, J. H.; Dinklage, A. Nuclear Fusion, Vol. 45, Issue 12 https://doi.org/10.1088/0029-5515/45/12/024	journal	November 2005
Enhanced energy confinement after series of pellets in Wendelstein 7-X Baldzuhn, J.; Damm, H.; Beidler, C. D. Plasma Physics and Controlled Fusion, Vol. 62, Issue 5 https://doi.org/10.1088/1361-6587/ab8112	journal	April 2020
On the role of density fluctuations in the core turbulent transport of Wendelstein 7-X Carralero, D.; Estrada, T.; Maragkoudakis, E. Plasma Physics and Controlled Fusion, Vol. 64, Issue 4 https://doi.org/10.1088/1361-6587/ac4d14	journal	February 2022
Wall conditioning at the Wendelstein 7-X stellarator operating with a graphite divertor Goriaev, A.; Wauters, T.; Brakel, R. Physica Scripta, Vol. T171 https://doi.org/10.1088/1402-4896/ab60fa	journal	January 2020
Diamagnetic energy measurement during the first operational phase at the Wendelstein 7-X stellarator Rahbarnia, K.; Thomsen, H.; Neuner, U. Nuclear Fusion, Vol. 58, Issue 9 https://doi.org/10.1088/1741-4326/aacab0	journal	July 2018
Observation of anomalous impurity transport during low-density experiments in W7-X with laser blow-off injections of iron Geiger, B.; Wegner, Th.; Beidler, C. D. Nuclear Fusion, Vol. 59, Issue 4 https://doi.org/10.1088/1741-4326/aaff71	journal	February 2019
First divertor physics studies in Wendelstein 7-X Sunn Pedersen, T.; König, R.; Jakubowski, M. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab280f	journal	July 2019
Increasing the density in Wendelstein 7-X: benefits and limitations Fuchert, G.; Brunner, K. J.; Rahbarnia, K. Nuclear Fusion, Vol. 60, Issue 3 https://doi.org/10.1088/1741-4326/ab6d40	journal	February 2020
High-performance plasmas after pellet injections in Wendelstein 7-X Bozhenkov, S. A.; Kazakov, Y.; Ford, O. P. Nuclear Fusion, Vol. 60, Issue 6 https://doi.org/10.1088/1741-4326/ab7867	journal	May 2020
Impact of boronizations on impurity sources and performance in Wendelstein 7-X Sereda, S.; Brezinsek, S.; Wang, E. Nuclear Fusion, Vol. 60, Issue 8 https://doi.org/10.1088/1741-4326/ab937b	journal	July 2020
Impact of the temperature ratio on turbulent impurity transport in Wendelstein 7-X Wegner, Thomas; Alcuson, Jorge Alberto; Geiger, Benedikt Nuclear Fusion https://doi.org/10.1088/1741-4326/abb869	journal	September 2020
Radial electric field and density fluctuations measured by Doppler reflectometry during the post-pellet enhanced confinement phase in W7-X Estrada, T.; Carralero, D.; Windisch, T. Nuclear Fusion, Vol. 61, Issue 4 https://doi.org/10.1088/1741-4326/abddee	journal	March 2021
First neutral beam experiments on Wendelstein 7-X Lazerson, Samuel A.; Ford, Oliver; Äkaslompolö, Simppa Nuclear Fusion, Vol. 61, Issue 9 https://doi.org/10.1088/1741-4326/ac121c	journal	July 2021
Ion temperature clamping in Wendelstein 7-X electron cyclotron heated plasmas Beurskens, M. N. A.; Bozhenkov, S. A.; Ford, O. Nuclear Fusion, Vol. 61, Issue 11 https://doi.org/10.1088/1741-4326/ac1653	journal	October 2021
High-performance ECRH at W7-X: experience and perspectives Laqua, H. P.; Baldzuhn, J.; Braune, H. Nuclear Fusion, Vol. 61, Issue 10 https://doi.org/10.1088/1741-4326/ac1a1b	journal	August 2021
Impurity transport in ion- and electron-root confinement scenarios at Wendelstein 7-X Langenberg, A.; Wegner, Th.; Marchuk, O. Nuclear Fusion, Vol. 61, Issue 11 https://doi.org/10.1088/1741-4326/ac24d4	journal	September 2021
Experimental confirmation of efficient island divertor operation and successful neoclassical transport optimization in Wendelstein 7-X Sunn Pedersen, Thomas Nuclear Fusion https://doi.org/10.1088/1741-4326/ac2cf5	journal	October 2021
Magnetic configuration scans during divertor operation of Wendelstein 7-X Andreeva, T.; Geiger, J.; Dinklage, A. Nuclear Fusion, Vol. 62, Issue 2 https://doi.org/10.1088/1741-4326/ac3f1b	journal	January 2022
Suppression of anomalous impurity transport in NBI-heated W7-X plasmas Romba, T.; Reimold, F.; Jaspers, R. J. E. Nuclear Fusion, Vol. 63, Issue 7 https://doi.org/10.1088/1741-4326/acd5e1	journal	June 2023
Long plasma duration operation analyses with an international multi-machine (tokamaks and stellarators) database Litaudon, X.; Bosch, H. -S.; Morisaki, T. Nuclear Fusion, Vol. 64, Issue 1 https://doi.org/10.1088/1741-4326/ad0606	journal	November 2023
Real-time dispersion interferometry for density feedback in fusion devices Brunner, K. J.; Akiyama, T.; Hirsch, M. Journal of Instrumentation, Vol. 13, Issue 09 https://doi.org/10.1088/1748-0221/13/09/P09002	journal	September 2018
First Observation of a Stable Highly Dissipative Divertor Plasma Regime on the Wendelstein 7-X Stellarator Zhang, D.; König, R.; Feng, Y. Physical Review Letters, Vol. 123, Issue 2 https://doi.org/10.1103/PhysRevLett.123.025002	journal	July 2019
Turbulence Mechanisms of Enhanced Performance Stellarator Plasmas Xanthopoulos, P.; Bozhenkov, S. A.; Beurskens, M. N. Physical Review Letters, Vol. 125, Issue 7 https://doi.org/10.1103/PhysRevLett.125.075001	journal	August 2020

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