This title appears in the Scientific Report :
2017
Please use the identifier:
http://dx.doi.org/10.1088/1741-4326/aa70f4 in citations.
Argon impurity transport studies at Wendelstein 7-X using x-ray imaging spectrometer measurements
Argon impurity transport studies at Wendelstein 7-X using x-ray imaging spectrometer measurements
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 . Thi...
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Personal Name(s): | Langenberg, A. (Corresponding author) |
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Pablant, N. A. / Marchuk, O. / Alonso, J. A. / Burhenn, R. / Svensson, J. / Valson, P. / Gates, D. / Beurskens, M. / Wolf, R. C. / Zhang, D. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Nuclear fusion, 57 (2017) 8, S. 086013 - |
Imprint: |
Vienna
IAEA
2017
|
DOI: |
10.1088/1741-4326/aa70f4 |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wall-Interaction |
Publikationsportal JuSER |
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. |