Measurements of Impurity Transport Due to Drift-Wave Turbulence in a Toroidal Plasma

Nishizawa, T.; Nornberg, M. D.; Boguski, J.; Den Hartog, D. J.; Sarff, J. S.; Williams, Z. R.; Xing, Z. A.; Craig, D.

doi:10.1103/physrevlett.121.165002

Title: Measurements of Impurity Transport Due to Drift-Wave Turbulence in a Toroidal Plasma

Journal Article · 18 October 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.121.165002 · OSTI ID:1609213

Nishizawa, T. ^[1]; Nornberg, M. D. ^[2]; Boguski, J. ^[2]; Den Hartog, D. J. ^[2]; Sarff, J. S. ^[2]; Williams, Z. R. ^[2]; Xing, Z. A. ^[2]; Craig, D. ^[3]

Univ. of Wisconsin, Madison, WI (United States); DOE/OSTI
Univ. of Wisconsin, Madison, WI (United States)
Wheaton College, Wheaton, IL (United States)

The first direct measurements of an impurity particle flux driven by drift-wave turbulence in a toroidal magnetized plasma are reported. The correlation between the impurity density and radial velocity fluctuations is measured using ion Doppler spectroscopy. The small, very fast radial velocity fluctuation is resolved with the aid of a new linearized spectrum correlation analysis method that rejects uncorrelated noise as the sample size increases. The measured C²⁺ turbulent impurity flux in the edge of the plasma is directed inward and is consistent with impurity density measurements. This is also the first direct evidence for fluctuation-induced transport due to trapped-electron-mode turbulence in reversed field pinch plasmas.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: FC02-05ER54814

OSTI ID:: 1609213

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 121; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Direct Measurement of a Toroidally Directed Zonal Flow in a Toroidal Plasma Nishizawa, T.; Almagri, A. F.; Anderson, J. K. Physical Review Letters, Vol. 122, Issue 10 https://doi.org/10.1103/physrevlett.122.105001	journal	March 2019

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