%0 Journal Article
%A Han, X.
%A Krämer-Flecken, A.
%A Xiang, H. M.
%A Vécsei, M.
%A Knieps, A.
%A Windisch, T.
%A Anda, G.
%A Andreeva, T.
%A Bozhenkov, S. A.
%A Geiger, J.
%A Dunai, D.
%A Trier, E.
%A Rahbarnia, K.
%A Zoletnik, S.
%A Liang, Y.
%A W7-X Team, the
%T Application of the elliptic approximation model for the edge turbulence rotation measurement via the poloidal correlation reflectometer in Wendelstein 7-X
%J Nuclear fusion
%V 61
%N 6
%@ 0029-5515
%C Vienna
%I IAEA
%M FZJ-2021-05619
%P 066029 -
%D 2021
%Z kein Zugriff auf Postprint
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000655413400001
%R 10.1088/1741-4326/abfb15
%U https://juser.fz-juelich.de/record/904049