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Title: High spatial and temporal resolution charge exchange recombination spectroscopy on the HL-2A tokamak

A 32/64-channel charge exchange recombination spectroscopy (CXRS) diagnostic system is developed on the HL-2A tokamak (R = 1.65 m, a = 0.4 m), monitoring plasma ion temperature and toroidal rotation velocity simultaneously. A high throughput spectrometer (F/2.8) and a pitch-controlled fiber bundle enable the temporal resolution of the system up to 400 Hz. The observation geometry and an optimized optic system enable the highest radial resolution up to ~1 cm at the plasma edge. The CXRS system monitors the carbon line emission (C VI, n = 8–7, 529.06 nm) whose Doppler broadening and Doppler shift provide ion temperature and plasma rotation velocity during the neutral beam injection. The composite CX spectral data are analyzed by the atomic data and analysis structure charge exchange spectroscopy fitting (ADAS CXSFIT) code. First experimental results are shown for the case of HL-2A plasmas with sawtooth oscillations, electron cyclotron resonance heating, and edge transport barrier during the high-confinement mode (H-mode)
Authors:
; ; ; ; ; ; ; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Southwestern Institute of Physics, Chengdu 610041 (China)
  2. National Institute for Fusion Science, Toki 509-5292 (Japan)
  3. ITER Diagnostic Team, IO, Route de Vinon sur Verdon, 13115 St Paul lez Durance (France)
  4. (Netherlands)
Publication Date:
OSTI Identifier:
22305887
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CHARGE EXCHANGE; DOPPLER EFFECT; ECR HEATING; HL-2A TOKAMAK; H-MODE PLASMA CONFINEMENT; ION TEMPERATURE; PLASMA; PLASMA DIAGNOSTICS; RECOMBINATION; SAWTOOTH OSCILLATIONS; SPATIAL RESOLUTION; SPECTROMETERS; SPECTROSCOPY; TIME RESOLUTION