This title appears in the Scientific Report :
2021
Please use the identifier:
http://dx.doi.org/10.1063/1.5054279 in citations.
Please use the identifier: http://hdl.handle.net/2128/27490 in citations.
A new multi-channel Mach probe measuring the radial ion flow velocity profile in the boundary plasma of the W7-X stellarator
A new multi-channel Mach probe measuring the radial ion flow velocity profile in the boundary plasma of the W7-X stellarator
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...
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Personal Name(s): | Cai, J. |
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Liang, Yunfeng (Corresponding author) / Killer, C. / Liu, S. / Hiller, A. / Knieps, A. / Schweer, B. / Höschen, D. / Nicolai, D. / Offermanns, G. / Satheeswaran, G. / Henkel, Marion / Hollfeld, K. / Grulke, O. / Drews, P. / Krings, T. / Li, Y. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Review of scientific instruments, 90 (2019) 3, S. 033502 - |
Imprint: |
[S.l.]
American Institute of Physics
2019
|
DOI: |
10.1063/1.5054279 |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wall-Interaction |
Link: |
Published on 2019-03-07. Available in OpenAccess from 2020-03-07. |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/27490 in citations.
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 |