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Title: Toroidal mode number estimation of the edge-localized modes using the KSTAR 3-D electron cyclotron emission imaging system

A new and more accurate technique is presented for determining the toroidal mode number n of edge-localized modes (ELMs) using two independent electron cyclotron emission imaging (ECEI) systems in the Korea Superconducting Tokamak Advanced Research (KSTAR) device. The technique involves the measurement of the poloidal spacing between adjacent ELM filaments, and of the pitch angle α{sub *} of filaments at the plasma outboard midplane. Equilibrium reconstruction verifies that α{sub *} is nearly constant and thus well-defined at the midplane edge. Estimates of n obtained using two ECEI systems agree well with n measured by the conventional technique employing an array of Mirnov coils.
Authors:
; ; ; ; ;  [1] ;  [2] ; ;  [3] ; ;  [4] ; ;  [5]
  1. Pohang University of Science and Technology, Pohang 790-784 (Korea, Republic of)
  2. Ulsan National Institute of Science and Technology, Ulsan 689-798 (Korea, Republic of)
  3. University of California at Davis, Davis, California 95616 (United States)
  4. Columbia University, New York, New York 10027 (United States)
  5. National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22308807
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CYCLOTRONS; EDGE LOCALIZED MODES; ELECTRON CYCLOTRON-RESONANCE; EMISSION; EVALUATION; FILAMENTS; IMAGES; TOKAMAK DEVICES