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

Wolf, R. C.; Bozhenkov, S.; Dinklage, A.; Fuchert, G.; Kazakov, Y. O.; Laqua, H. P.; Marsen, S.; Marushchenko, N. B.; Stange, T.; Zanini, M.; Abramovic, I.; Alonso, A.; Baldzuhn, J.; Beurskens, M.; Beidler, C. D.; Braune, H.; Brunner, K. J.; Chaudhary, N.; Damm, H.; Drewelow, P.; Gantenbein, G.; Gao, Yu; Geiger, J.; Hirsch, M.; Höfel, U.; Jakubowski, M.; Jelonnek, J.; Jensen, T.; Kasparek, W.; Knauer, J.; Korsholm, S. B.; Langenberg, A.; Lechte, C.; Leipold, F.; Mora, H. Trimino; Neuner, U.; Nielsen, S. K.; Moseev, D.; Oosterbeek, H.; Pablant, N.; Pasch, E.; Plaum, B.; Pedersen, T. Sunn; Sitjes, A. Puig; Rahbarnia, K.; Rasmussen, J.; Salewski, M.; Schilling, J.; Scott, E.; Stejner, M.; Thomsen, H.; Thumm, M.; Turkin, Y.; Wilde, F.

doi:10.1088/1361-6587/aaeab2

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

Journal Article · 26 November 2018 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/1361-6587/aaeab2 · OSTI ID:1485472

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; Dinklage, A.; Fuchert, G.; Kazakov, Y. O.; Laqua, H. P.; Marsen, S.; Marushchenko, N. B.; Stange, T.; Zanini, M.; Abramovic, I.; Alonso, A.; Baldzuhn, J.; Beurskens, M.; Beidler, C. D.; Braune, H.; Brunner, K. J.; Chaudhary, N.; Damm, H.; Drewelow, P. more »

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 application in a fusion power plant. Wendelstein 7-X (W7-X) is equipped with a steady-state capable ECRH system, operating at 140 GHz, which corresponds to the 2nd cyclotron harmonic of the electrons at a magnetic field of 2.5 T. Ten gyrotrons are operational and already delivered 7 MW to W7-X plasmas. Combined with pellet injection, the highest triple product (0.68 × 10²⁰ keV m^–3 s), observed up to now in stellarators, was achieved. For the first time, W7-X plasmas were sustained by 2nd harmonic O-mode heating, approaching the collisionality regime for which W7-X was optimized. Power deposition scans did not show any indication of electron temperature profile resilience. In low-density, low-power plasmas a compensation of the bootstrap current with electron-cyclotron current drive (ECCD) was demonstrated. Furthermore, sufficiently strong ECCD close to the plasma centre produced periodic internal plasma-crash events, which coincide with the appearance of low order rationals of the rotational transform.

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

Sponsoring Organization:: USDOE

Contributing Organization:: the Wendelstein 7-X Team

OSTI ID:: 1485472

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 1 Vol. 61; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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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 exchange recombination spectroscopy at Wendelstein 7-X Ford, O. P.; Vanó, L.; Alonso, J. A. Review of Scientific Instruments, Vol. 91, Issue 2 https://doi.org/10.1063/1.5132936	journal	February 2020
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Pellet fueling experiments in Wendelstein 7-X Baldzuhn, J.; Damm, H.; Beidler, C. D. Plasma Physics and Controlled Fusion, Vol. 61, Issue 9 https://doi.org/10.1088/1361-6587/ab3567	journal	August 2019
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