Abstract
| Original language | English |
|---|---|
| Article number | 014037 |
| Journal | Plasma Physics and Controlled Fusion |
| Volume | 61 |
| Issue number | 1 |
| Number of pages | 9 |
| ISSN | 0741-3335 |
| DOIs | |
| Publication status | Published - 2019 |
| Event | 45th EPS Conference on Plasma Physics - Prague, Czech Republic Duration: 2 Jul 2018 → 6 Jul 2018 |
Conference
| Conference | 45th EPS Conference on Plasma Physics |
|---|---|
| Country | Czech Republic |
| City | Prague |
| Period | 02/07/2018 → 06/07/2018 |
Keywords
- Stellerator
- Wendelstein 7-X
- Electron-cyclotron-resonance heating and current drive
Cite this
}
Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies : Paper. / Wendelstein 7-X Team; 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, Søren Bang; 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.
In: Plasma Physics and Controlled Fusion, Vol. 61, No. 1, 014037, 2019.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies
T2 - Paper
AU - Wendelstein 7-X Team
AU - Wolf, R C
AU - Bozhenkov, S
AU - Dinklage, A
AU - Fuchert, G
AU - Kazakov, Y O
AU - Laqua, H P
AU - Marsen, S
AU - Marushchenko, N B
AU - Stange, T
AU - Zanini, M
AU - Abramovic, I
AU - Alonso, A
AU - Baldzuhn, J
AU - Beurskens, M
AU - Beidler, C D
AU - Braune, H
AU - Brunner, K J
AU - Chaudhary, N
AU - Damm, H
AU - Drewelow, P
AU - Gantenbein, G
AU - Gao, Yu
AU - Geiger, J
AU - Hirsch, M
AU - Höfel, U
AU - Jakubowski, M
AU - Jelonnek, J
AU - Jensen, T
AU - Kasparek, W
AU - Knauer, J
AU - Korsholm, Søren Bang
AU - Langenberg, A
AU - Lechte, C
AU - Leipold, F.
AU - Mora, H Trimino
AU - Neuner, U
AU - Nielsen, S. K.
AU - Moseev, D
AU - Oosterbeek, H
AU - Pablant, N
AU - Pasch, E
AU - Plaum, B
AU - Pedersen, T Sunn
AU - Sitjes, A Puig
AU - Rahbarnia, K
AU - Rasmussen, J.
AU - Salewski, M.
AU - Schilling, J
AU - Scott, E
AU - Stejner, M.
AU - Thomsen, H
AU - Thumm, M
AU - Turkin, Y
AU - Wilde, F
PY - 2019
Y1 - 2019
N2 - 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 (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.
AB - 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 (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.
KW - Stellerator
KW - Wendelstein 7-X
KW - Electron-cyclotron-resonance heating and current drive
U2 - 10.1088/1361-6587/aaeab2
DO - 10.1088/1361-6587/aaeab2
M3 - Journal article
VL - 61
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
SN - 0741-3335
IS - 1
M1 - 014037
ER -