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000891425 1001_ $$0P:(DE-Juel1)171371$$aCai, J.$$b0
000891425 245__ $$aA new multi-channel Mach probe measuring the radial ion flow velocity profile in the boundary plasma of the W7-X stellarator
000891425 260__ $$a[S.l.]$$bAmerican Institute of Physics$$c2019
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000891425 520__ $$aIon flow velocity measurement in the edge and scraper-off layer region is beneficial to understand the confinement related phenomenon in fusion devices such as impurity transport and plays an important role in impurity control. During the Wendelstein 7-X (W7-X) operation phase 1.2a, a multi-channel (MC) Mach probe mounted on the multi-purpose manipulator has been used to measure radial profiles of edge ion flow velocity. This MC-Mach probe consists of two polar and two radial arrays of directional Langmuir pins (28 pins in total) serving for different aims, of which the polar arrays could obtain a polar distribution of ion saturation current, while the radial arrays can be used to study the dynamic process of a radially propagated event. In this paper, we report the observation of the radially outward propagation of a low frequency mode with a speed of around 200 m/s. The first measurement of the radial ion flow velocity profile using the MC-Mach probe in the boundary plasma of the W7-X with an island divertor will also be presente
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000891425 7001_ $$0P:(DE-Juel1)130088$$aLiang, Yunfeng$$b1$$eCorresponding author
000891425 7001_ $$00000-0001-7747-3066$$aKiller, C.$$b2
000891425 7001_ $$0P:(DE-HGF)0$$aLiu, S.$$b3
000891425 7001_ $$0P:(DE-Juel1)130036$$aHiller, A.$$b4
000891425 7001_ $$0P:(DE-Juel1)173792$$aKnieps, A.$$b5
000891425 7001_ $$0P:(DE-Juel1)130154$$aSchweer, B.$$b6
000891425 7001_ $$0P:(DE-Juel1)166541$$aHöschen, D.$$b7
000891425 7001_ $$0P:(DE-Juel1)130112$$aNicolai, D.$$b8
000891425 7001_ $$0P:(DE-Juel1)133716$$aOffermanns, G.$$b9
000891425 7001_ $$0P:(DE-Juel1)130135$$aSatheeswaran, G.$$b10
000891425 7001_ $$0P:(DE-Juel1)168196$$aHenkel, Marion$$b11$$ufzj
000891425 7001_ $$0P:(DE-Juel1)133683$$aHollfeld, K.$$b12
000891425 7001_ $$0P:(DE-HGF)0$$aGrulke, O.$$b13
000891425 7001_ $$0P:(DE-Juel1)162257$$aDrews, P.$$b14
000891425 7001_ $$0P:(DE-Juel1)164595$$aKrings, T.$$b15
000891425 7001_ $$0P:(DE-Juel1)173935$$aLi, Y.$$b16
000891425 773__ $$0PERI:(DE-600)1472905-2$$a10.1063/1.5054279$$gVol. 90, no. 3, p. 033502 -$$n3$$p033502 -$$tReview of scientific instruments$$v90$$x1089-7623$$y2019
000891425 8564_ $$uhttps://juser.fz-juelich.de/record/891425/files/1.5054279.pdf$$yPublished on 2019-03-07. Available in OpenAccess from 2020-03-07.
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