Simultaneous detection of neoclassical tearing mode and electron cyclotron current drive locations using electron cyclotron emission in DIII-D

A. O. Nelson, R. J. La Haye, M. E. Austin, A. S. Welander, E. Kolemen

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Accurate real-time measurements of magnetic island and electron cyclotron current drive (ECCD) locations are essential for efficient suppression of the neoclassical tearing mode (NTM). To determine these locations, many control systems rely on motional Stark effect constrained equilibria reconstruction and real-time Thomson scattering with TORBEAM current drive evaluation and therefore require time-intensive cross-calibration of at least two different diagnostics. Here we present a simpler, proof-of-concept analysis that uses only a single diagnostic (a radial array electron cyclotron emission radiometer) for the simultaneous determination of both the radial position of a magnetic island and the deposition location of ECCD. Measurements are compared with the modified Rutherford equation to demonstrate the effect of ECCD alignment on NTM suppression.

Original languageEnglish (US)
Pages (from-to)25-29
Number of pages5
JournalFusion Engineering and Design
Volume141
DOIs
StatePublished - Apr 2019

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Keywords

  • DIII-D
  • ECCD
  • ECE
  • NTM
  • Plasma
  • Tokamak control

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