Review of Scientific Instruments · 2020 · 10 citations · 31 references
EngineeringMeasurementOptical TestingInterferometryOptical MetrologyEducationOptical CharacterizationMagnetic Confinement FusionScrape-off-layer ImpurityDoppler Coherence ImagingDoppler CoherenceCoherent Gradient SensingOptical DiagnosticsCalibrationControlled Nuclear FusionPhotonic MetrologyMagnetohydrodynamicsInstrumentationOptical SystemsFringe Pattern CalibrationPhysicsHl-2a TokamakTime MetrologyThermal PhysicsOptical MeasurementRadiometryHigh-frequency MeasurementGroup Delay CalibrationSpectroscopyOptical System Analysis
A new Doppler coherence imaging spectroscopy interferometer has been developed on the HL-2A tokamak for the scrape-off-layer impurity flow measurement. Its spatial resolution is estimated to be up to ∼0.8 mm in the horizontal direction and ∼9 mm in the vertical direction, with a field of view of ∼34°. Its typical temporal resolution is about 1 ms. This salient feature allows for time-resolved 2D measurements in short-time phenomena on HL-2A, such as edge localized modes. Group delay and interference fringe pattern were calibrated with a dedicated calibration system. The robustness of group delay calibration and the feasibility of the extrapolation model for fringe pattern calibration are demonstrated. In this paper, we report the details of the optical instruments, calibration, and the initial experimental results of this Doppler coherence imaging spectroscopy interferometer.
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Chapter 1: Overview and summary
M. Shimada, D. Campbell, V. Mukhovatov et al. · Nuclear Fusion · 2007 · 803 citations
Chapter 2: Plasma confinement and transport
E. J. Doyle, W. A. Houlberg, Y. Kamada et al. · Nuclear Fusion · 2007 · 803 citations · Full text