Quasi-coherent fluctuation measurement with the upgraded microwave imaging reflectometer in KSTAR

W. Lee, J. Leem, D. J. Lee, M. J. Choi, H. K. Park, J. A. Lee, G. S. Yun, T. G. Kim, H. Park, K. W. Kim

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The microwave imaging reflectometer (MIR) is the leading diagnostic tool for study of density fluctuations in KSTAR. For last three years since 2014, major components such as the multi-frequency probe beam source, multi-channel detector array, signal processing electronic system, data acquisition system, and optical system have been gradually upgraded. In this paper, the detailed system upgrade with test results in the laboratory and/or plasma is given, and analysis results of a distinctive fluctuation structure referred to as the quasi-coherent mode (QCM) measured by the upgraded MIR system for an L-mode discharge are presented. Cross-coherence analysis with multiple channels shows that the QCM is localized in a core region and appears to be driven by electron temperature gradient for the discharge.

Original languageEnglish
Article number115009
JournalPlasma Physics and Controlled Fusion
Volume60
Issue number11
DOIs
StatePublished - 1 Oct 2018

Keywords

  • Microwave imaging reflectometer
  • coherence analysis
  • multi-frequency probe beam source
  • multichannel detector array
  • quasi-coherent mode

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