First measurement of the edge charge exchange recombination spectroscopy on EAST tokamak

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4955279· OSTI ID:22596636

Fu, J.; Jiang, D.; Lyu, B.; Hu, C. D.; Wan, B. N. ^[1]; Yin, X. H.; Feng, S. Y. ^[1]; Shi, Y. J. ^[2]; Yi, Y.; Ye, M. Y. ^[2]; Zhou, X. J. ^[3]

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1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei (China)
2. School of Nuclear Science and Technology, University of Science and Technology of China, Hefei (China)
3. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031 (China)

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.

• OSTI ID: 22596636
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 11; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BEAM INJECTION
BEAMS
CALIBRATION
CARBON
CHARGE EXCHANGE
CHARGE-COUPLED DEVICES
EMISSION
FIBERS
HEATING
HT-7U TOKAMAK
ION TEMPERATURE
NEON
ROTATION
SIGNALS
SIGNAL-TO-NOISE RATIO
SPATIAL RESOLUTION
VELOCITY
WAVELENGTHS