|Title||High spatial and temporal resolution charge exchange recombination spectroscopy on the HL-2A tokamak|
|Publication Type||Journal Article|
|Year of Publication||2014|
|Authors||Y.L Wei, D.L Yu, L. Liu, K. Ida, M. von Hellermann, J.Y Cao, A.P Sun, Q. Ma, W.J Chen, Y Liu, L.W Yan, Q.W Yang, X.R Duan, Y Liu|
|Journal||Review of Scientific Instruments|
|Keywords||charge exchange, Doppler broadening, Doppler shift, plasma beam injection heating, plasma diagnostics, plasma oscillations, plasma radiofrequency heating, plasma temperature, plasma toroidal confinement, Tokamak devices|
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).
|Alternate Title||Rev. Sci. Instrum.|
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