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000858022 1001_ $$0P:(DE-HGF)0$$aLiu, S. C.$$b0$$eCorresponding author
000858022 245__ $$aCharacteristics of the SOL turbulence structure in the first experimental campaign on W7-X with limiter configuration
000858022 260__ $$a[S.l.]$$bAmerican Institute of Physics$$c2018
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000858022 520__ $$aIn the first experimental campaign of Wendelstein 7-X (W7-X), a combined probe head mounted on the multi-purpose manipulator has been used to measure the scrape-off layer (SOL) turbulence characteristics. The preliminary experimental results are summarized to illustrate the SOL turbulence properties in the limiter configuration on W7-X. In a standard limiter configuration, significant electrostatic fluctuations can be found in the near SOL, and the dominant frequency of fluctuation power is below 100 kHz. The auto-correlation spectrum power law decay factor is α ≈ −1 below 40 kHz and α ≈ –2 between 50 and 200 kHz. A broadband spectrum appears between 240 and 380 kHz with a low spectral power density, but a high cross-correlation coefficient. The statistical characteristics of turbulence are calculated by the two-point cross-correlation technique. A clear poloidal dispersion relation is found in the spectrum S(kθ, f), propagating along the ion diamagnetic drift direction with a group velocity (below 100 kHz) about 0.56 km/s in the near SOL in the laboratory frame. The poloidal correlation length is around 5–10 mm in SOL. The turbulence phase velocity is about 0.5–1 km/s when close to the last closed flux surface, which is comparable with the poloidal E × B drift speed.
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000858022 7001_ $$0P:(DE-Juel1)130088$$aLiang, Yunfeng$$b1
000858022 7001_ $$0P:(DE-Juel1)162257$$aDrews, P.$$b2
000858022 7001_ $$0P:(DE-Juel1)130075$$aKrämer-Flecken, A.$$b3
000858022 7001_ $$0P:(DE-Juel1)171363$$aHan, X.$$b4
000858022 7001_ $$0P:(DE-Juel1)130112$$aNicolai, D.$$b5
000858022 7001_ $$0P:(DE-Juel1)130135$$aSatheeswaran, G.$$b6
000858022 7001_ $$0P:(DE-HGF)0$$aWang, N. C.$$b7
000858022 7001_ $$0P:(DE-Juel1)171371$$aCai, Jianqing$$b8
000858022 7001_ $$0P:(DE-Juel1)129982$$aCharl, A.$$b9
000858022 7001_ $$0P:(DE-Juel1)167468$$aCosfeld, J.$$b10
000858022 7001_ $$0P:(DE-Juel1)161317$$aGao, Yu$$b11
000858022 7001_ $$0P:(DE-HGF)0$$aGrulke, O.$$b12
000858022 7001_ $$0P:(DE-Juel1)168196$$aHenkel, M.$$b13
000858022 7001_ $$0P:(DE-Juel1)133683$$aHollfeld, K. P.$$b14
000858022 7001_ $$0P:(DE-HGF)0$$aKiller, C.$$b15
000858022 7001_ $$0P:(DE-Juel1)173792$$aKnieps, A.$$b16
000858022 7001_ $$0P:(DE-Juel1)159297$$aKönig, R.$$b17
000858022 7001_ $$0P:(DE-Juel1)130109$$aNeubauer, O.$$b18
000858022 7001_ $$0P:(DE-Juel1)145407$$aRack, M.$$b19
000858022 7001_ $$0P:(DE-Juel1)130134$$aSandri, N.$$b20
000858022 7001_ $$0P:(DE-Juel1)168195$$aSereda, S.$$b21
000858022 7001_ $$0P:(DE-Juel1)130154$$aSchweer, B.$$b22
000858022 7001_ $$0P:(DE-Juel1)168296$$aWang, Erhui$$b23
000858022 7001_ $$0P:(DE-Juel1)168343$$aWei, Yanling$$b24
000858022 773__ $$0PERI:(DE-600)1472746-8$$a10.1063/1.5033353$$gVol. 25, no. 7, p. 072502 -$$n7$$p072502 -$$tPhysics of plasmas$$v25$$x1089-7674$$y2018
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