Argon impurity transport studies at Wendelstein 7-X using x-ray imaging spectrometer measurements

被引：26

作者：

Langenberg, A. ^{[1
]}

Pablant, N. A. ^{[2
]}

Marchuk, O. ^{[3
]}

Zhang, D. ^{[1
]}

Alonso, J. A. ^{[4
]}

Burhenn, R. ^{[1
]}

Svensson, J. ^{[1
]}

Valson, P. ^{[1
]}

Gates, D. ^{[2
]}

Beurskens, M. ^{[1
]}

Wolf, R. C. ^{[1
]}

机构：

[1] Max Planck Inst Plasma Phys, Greifswald, Germany

[2] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA

[3] Forschungszentrum Julich, Inst Energie & Klimaforsch, Julich, Germany

[4] Lab Nacl Fus CIEMAT, Madrid 28040, Spain

来源：

NUCLEAR FUSION | 2017年 / 57卷 / 08期

关键词：

impurity transport; x-ray imaging spectrometer; He-like argon; Bayesian analysis; HE-LIKE SPECTRA; PLASMAS; TOKAMAK;

D O I：

10.1088/1741-4326/aa70f4

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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 m(2) s(-1) at rho similar to 0.5 and small pinch velocities in the inner plasma region.

引用

页数：7

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