title: High spatial and temporal resolution charge exchange recombination spectroscopy on the HL-2A tokamak.
abstract: 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.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: Y L
authors.initials: YL
authors.lastname: Wei
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: D L
authors.initials: DL
authors.lastname: Yu
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: L
authors.initials: L
authors.lastname: Liu
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ida
authors.affiliation: ITER Diagnostic Team, IO, Route de Vinon sur Verdon, 13115 St Paul lez Durance, France.
authors.forename: M
authors.initials: M
authors.lastname: von Hellermann
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: J Y
authors.initials: JY
authors.lastname: Cao
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: A P
authors.initials: AP
authors.lastname: Sun
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: Q
authors.initials: Q
authors.lastname: Ma
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: W J
authors.initials: WJ
authors.lastname: Chen
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: L W
authors.initials: LW
authors.lastname: Yan
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: Q W
authors.initials: QW
authors.lastname: Yang
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: X R
authors.initials: XR
authors.lastname: Duan
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu