TY  - JOUR
AU  - Han, X.
AU  - Krämer-Flecken, A.
AU  - Xiang, H. M.
AU  - Vécsei, M.
AU  - Knieps, A.
AU  - Windisch, T.
AU  - Anda, G.
AU  - Andreeva, T.
AU  - Bozhenkov, S. A.
AU  - Geiger, J.
AU  - Dunai, D.
AU  - Trier, E.
AU  - Rahbarnia, K.
AU  - Zoletnik, S.
AU  - Liang, Y.
AU  - W7-X Team, the
TI  - Application of the elliptic approximation model for the edge turbulence rotation measurement via the poloidal correlation reflectometer in Wendelstein 7-X
JO  - Nuclear fusion
VL  - 61
IS  - 6
SN  - 0029-5515
CY  - Vienna
PB  - IAEA
M1  - FZJ-2021-05619
SP  - 066029 -
PY  - 2021
N1  - kein Zugriff auf Postprint
AB  - The perpendicular velocity (v⊥) of turbulence is measured by means of a hopping poloidal correlation reflectometer diagnostic for the study of turbulence rotation in the plasma edge region in Wendelstein 7-X. An elliptic approximation (EA) model is applied for calculating the space-time correlation in the edge region. The v⊥ profile is compared in the high-ι (edge ι ≈ 1.2) and limiter (edge ι < 1) configurations. It is found that the v⊥ gradient is inversely proportional to the heating power in the high-ι configuration, which could be attributed to the turbulence activities in the plasma edge. In the limiter configuration, the v⊥ spike is observed near the island boundary, which is corresponded to the plasma current crash. In the standard configuration (edge ι ≈ 1), the v⊥ profile in the island region distributes as a function of the perpendicular separation. With increasing of the plasma current, the island enlarges the size as is referred from the v⊥ scope, accompanying with steepening of the v⊥ gradient at the boundary of the island.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000655413400001
DO  - DOI:10.1088/1741-4326/abfb15
UR  - https://juser.fz-juelich.de/record/904049
ER  -