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

Journal Article · Fri Jan 15 04:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4940030· OSTI ID:22482820

Park, H. K. ^[1]; Yun, G. S.; Nam, Y. B.; Choe, G. H. ^[2]; Lee, W. ^[3]; Jardin, S. ^[4]

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1. National Fusion Research Institute, Daejeon 34133 (Korea, Republic of)
2. Pohang University of Science and Technology, Pohang, Gyeongbuk 790-784 (Korea, Republic of)
3. Ulsan National Institute of Science and Technology, Ulsan 689-798 (Korea, Republic of)
4. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

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.

• OSTI ID: 22482820
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 87; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CALIBRATION
CYCLOTRONS
ELECTRON TEMPERATURE
EMISSION
FLUCTUATIONS
PLASMA
SAWTOOTH OSCILLATIONS
TEARING INSTABILITY
TOKAMAK DEVICES