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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.; ... mehr

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 7MW to W7-X plasmas. Combined with pellet injection, the highest triple product (0.68×10²⁰ keVm¯³s), observed up to now in stellarators, was achieved (Sunn Pedersen et al 2018 Plasma Phys. Control. Fusion 61 014035). 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. 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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Verlagsausgabe §
DOI: 10.5445/IR/1000089099
Veröffentlicht am 11.01.2019
DOI: 10.1088/1361-6587/aaeab2
Zitationen: 16
Web of Science
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 0032-1028, 0368-3281, 0741-3335, 1361-6587, 1879-2979, 2057-7648
KITopen-ID: 1000089099
HGF-Programm 31.03.02 (POF III, LK 01)
Plasma Heizsysteme
Erschienen in Plasma physics and controlled fusion
Band 61
Heft 1
Seiten Art. Nr.: 014037
Schlagwörter stellarator, Wendelstein 7-X, electron-cyclotron-resonance heating and current drive
Nachgewiesen in Web of Science
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