title: First measurement of the edge charge exchange recombination spectroscopy on EAST tokamak.
abstract: An edge toroidal charge exchange recombination spectroscopy (eCXRS) diagnostic, based on a heating neutral beam injection (NBI), has been deployed recently on the Experimental Advanced Superconducting Tokamak (EAST). The eCXRS, which aims to measure the plasma ion temperature and toroidal rotation velocity in the edge region simultaneously, is a complement to the exiting core CXRS (cCXRS). Two rows with 32 fiber channels each cover a radial range from ∼2.15 m to ∼2.32 m with a high spatial resolution of ∼5-7 mm. Charge exchange emission of Carbon VI CVI at 529.059 nm induced by the NBI is routinely observed, but can be tuned to any interested wavelength in the spectral range from 400 to 700 nm. Double-slit fiber bundles increase the number of channels, the fibers viewing the same radial position are binned on the CCD detector to improve the signal-to-noise ratio, enabling shorter exposure time down to 5 ms. One channel is connected to a neon lamp, which provides the real-time wavelength calibration on a shot-to-shot basis. In this paper, an overview of the eCXRS diagnostic on EAST is presented and the first results from the 2015 experimental campaign will be shown. Good agreements in ion temperature and toroidal rotation are obtained between the eCXRS and cCXRS systems.
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China.
authors.forename: Y Y
authors.initials: YY
authors.lastname: Li
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China.
authors.forename: X H
authors.initials: XH
authors.lastname: Yin
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China.
authors.forename: J
authors.initials: J
authors.lastname: Fu
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China.
authors.forename: D
authors.initials: D
authors.lastname: Jiang
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China.
authors.forename: S Y
authors.initials: SY
authors.lastname: Feng
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China.
authors.forename: B
authors.initials: B
authors.lastname: Lyu
authors.affiliation: School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, China.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Shi
authors.affiliation: School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Yi
authors.affiliation: Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: X J
authors.initials: XJ
authors.lastname: Zhou
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China.
authors.forename: C D
authors.initials: CD
authors.lastname: Hu
authors.affiliation: School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, China.
authors.forename: M Y
authors.initials: MY
authors.lastname: Ye
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China.
authors.forename: B N
authors.initials: BN
authors.lastname: Wan