On turbulence-correlation analysis based on correlation reflectometry

N. Teplova, K. Itoh, S. I. Itoh, E. Gusakov, S. Heuraux, S. Inagaki, M. Sasaki, T. Kobayashi, Y. Nagashima, S. Oldenbürger, A. Fujisawa

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Drift wave micro-turbulence is the main source of anomalous transport in a tokamak. Correlation reflectometry is a powerful diagnostic tool which provides information on plasma turbulence and subsequently on underlying instability. In this paper, theoretical expressions for the analysis of radial correlation reflectometry (RCR) data are derived. Integral kernels, which convert the correlation function of two microwave reflectometry signals into a correlation function of plasma turbulence and inverse, are discussed. The analytical expression and the method of combining the RCR diagnostic and another local density fluctuation (e.g. Doppler enhanced scattering or heavy ion beam probe) is proposed. The correlation between reflectometry signals and those from other local fluctuation measurements is analysed. The long-range tail of the correlation decays much more gradually than the turbulence correlation, however, it decays faster than that of two microwave reflectometry signals. The way to calculate turbulence wave number spectrum for this case is also proposed.

Original languageEnglish
Article number045502
JournalPhysica Scripta
Volume87
Issue number4
DOIs
Publication statusPublished - Apr 2013

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

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