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

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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number165002
JournalPhysical review letters
Volume121
Issue number16
DOIs
Publication statusPublished - Oct 19 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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