Journal Article

FZJ-2017-06063

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Argon impurity transport studies at Wendelstein 7-X using x-ray imaging spectrometer measurements

Langenberg, A. (Corresponding author) ; Pablant, N. A. ; Marchuk, O.FZJ* ; Alonso, J. A. ; Burhenn, R. ; Svensson, J. ; Valson, P. ; Gates, D. ; Beurskens, M. ; Wolf, R. C. ; Zhang, D.

2017
IAEA Vienna

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Please use a persistent id in citations: doi:10.1088/1741-4326/aa70f4

Abstract: In the first operational phase of the stellarator Wendelstein 7-X (W7-X), the x-ray imaging crystal spectrometer (XICS) system has been commissioned for measuring radial profiles of ion and electron temperature, T i and T e, plasma rotation velocities, v P, and selected impurity densities, n Z . This paper shows the first measurements of the spectrometer and gives an initial calculation of impurity transport parameters derived from an Ar impurity transport study. Using Bayesian analysis, the temporal evolution of Ar impurity density profiles after an Ar gas puff could be observed with a time resolution of up to 5 ms, yielding a maximum value for the diffusion coefficient of D  =  1.5 m2 s−1 at ρ ~ 0.5 and small pinch velocities in the inner plasma region.

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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 2017

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Database coverage:
Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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