Journal Article

FZJ-2021-01510

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A new multi-channel Mach probe measuring the radial ion flow velocity profile in the boundary plasma of the W7-X stellarator

Cai, J. ; Liang, Y. (Corresponding author)FZJ* ; Killer, C. ; Liu, S. ; Hiller, A. ; Knieps, A.FZJ* ; Schweer, B.FZJ* ; Höschen, D.FZJ* ; Nicolai, D.FZJ* ; Offermanns, G.FZJ* ; Satheeswaran, G.FZJ* ; Henkel, M.FZJ* ; Hollfeld, K.FZJ* ; Grulke, O. ; Drews, P.FZJ* ; Krings, T.FZJ* ; Li, Y.

2019
American Institute of Physics [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/27490  doi:10.1063/1.5054279

Abstract: Ion 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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Contributing Institute(s):

1. Plasmaphysik (IEK-4)

Research Program(s):

1. 174 - Plasma-Wall-Interaction (POF3-174) (POF3-174)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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