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Title: Post calibration of the two-dimensional electron cyclotron emission imaging instrument with electron temperature characteristics of the magnetohydrodynamic instabilities

The electron cyclotron emission imaging (ECEI) instrument is widely used to study the local electron temperature (T{sub e}) fluctuations by measuring the ECE intensity I{sub ECE} ∝ T{sub e} in tokamak plasmas. The ECEI measurement is often processed in a normalized fluctuation quantity against the time averaged value due to complication in absolute calibration. In this paper, the ECEI channels are relatively calibrated using the flat T{sub e} assumption of the sawtooth crash or the tearing mode island and a proper extrapolation. The 2-D relatively calibrated electron temperature (T{sub e,rel}) images are reconstructed and the displacement amplitude of the magnetohydrodynamic modes can be measured for the accurate quantitative growth analysis.
Authors:
 [1] ;  [1] ;  [2] ; ; ;  [3] ;  [4] ;  [5]
  1. National Fusion Research Institute, Daejeon 34133 (Korea, Republic of)
  2. (Korea, Republic of)
  3. Pohang University of Science and Technology, Pohang, Gyeongbuk 790-784 (Korea, Republic of)
  4. Ulsan National Institute of Science and Technology, Ulsan 689-798 (Korea, Republic of)
  5. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
Publication Date:
OSTI Identifier:
22482820
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 1; Other Information: (c) 2016 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; CALIBRATION; CYCLOTRONS; ELECTRON TEMPERATURE; EMISSION; FLUCTUATIONS; PLASMA; SAWTOOTH OSCILLATIONS; TEARING INSTABILITY; TOKAMAK DEVICES