TY - JOUR
T1 - Advanced electron cyclotron heating and current drive experiments on the stellarator Wendelstein 7-X
AU - Stange, Torsten
AU - Laqua, Heinrich Peter
AU - Beurskens, Marc
AU - Bosch, Hans Stephan
AU - Bozhenkov, Sergey
AU - Brakel, Rudolf
AU - Braune, Harald
AU - Brunner, Kai Jakob
AU - Cappa, Alvaro
AU - Dinklage, Andreas
AU - Erckmann, Volker
AU - Fuchert, Golo
AU - Gantenbein, Gerd
AU - Gellert, Florian
AU - Grulke, Olaf
AU - Hartmann, Dirk
AU - Hirsch, Matthias
AU - Höfel, Udo
AU - Kasparek, Walter
AU - Knauer, Jens
AU - Langenberg, Andreas
AU - Marsen, Stefan
AU - Marushchenko, Nikolai
AU - Moseev, Dmitry
AU - Pablant, Novomir
AU - Pasch, Ekkehard
AU - Rahbarnia, Kian
AU - Mora, Humberto Trimino
AU - Tsujimura, Toru
AU - Turkin, Yuriy
AU - Wauters, Tom
AU - Wolf, Robert
N1 - Publisher Copyright:
© 2017 The authors, published by EDP Sciences.
PY - 2017/10/23
Y1 - 2017/10/23
N2 - During the first operational phase (OP 1.1) of Wendelstein 7-X (W7-X) electron cyclotron resonance heating (ECRH) was the exclusive heating method and provided plasma start-up, wall conditioning, heating and current drive. Six gyrotrons were commissioned for OP1.1 and used in parallel for plasma operation with a power of up to 4.3 MW. During standard X2-heating the spatially localized power deposition with high power density allowed controlling the radial profiles of the electron temperature and the rotational transform. Even though W7-X was not fully equipped with first wall tiles and operated with a graphite limiter instead of a divertor, electron densities of n e > 3·1019 m-3 could be achieved at electron temperatures of several keV and ion temperatures above 2 keV. These plasma parameters allowed the first demonstration of a multipath O2-heating scenario, which is envisaged for safe operation near the X-cutoff-density of 1.2·1020 m-3 after full commissioning of the ECRH system in the next operation phase OP1.2.
AB - During the first operational phase (OP 1.1) of Wendelstein 7-X (W7-X) electron cyclotron resonance heating (ECRH) was the exclusive heating method and provided plasma start-up, wall conditioning, heating and current drive. Six gyrotrons were commissioned for OP1.1 and used in parallel for plasma operation with a power of up to 4.3 MW. During standard X2-heating the spatially localized power deposition with high power density allowed controlling the radial profiles of the electron temperature and the rotational transform. Even though W7-X was not fully equipped with first wall tiles and operated with a graphite limiter instead of a divertor, electron densities of n e > 3·1019 m-3 could be achieved at electron temperatures of several keV and ion temperatures above 2 keV. These plasma parameters allowed the first demonstration of a multipath O2-heating scenario, which is envisaged for safe operation near the X-cutoff-density of 1.2·1020 m-3 after full commissioning of the ECRH system in the next operation phase OP1.2.
UR - https://www.scopus.com/pages/publications/85032639434
U2 - 10.1051/epjconf/201715702008
DO - 10.1051/epjconf/201715702008
M3 - Conference article
AN - SCOPUS:85032639434
SN - 2101-6275
VL - 157
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
M1 - 02008
T2 - 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017
Y2 - 30 May 2017 through 2 June 2017
ER -