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- W2092622496 endingPage "085006" @default.
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- W2092622496 abstract "An intensified visible camera looks tangentially at a poloidal limiter where helium recycles, acting as a wide neutral source, and the atomic line emission due to plasma excitation becomes strongly localized there. It includes a bifurcated coherent bundle, each end with a different interference filter to select helium atomic lines, so that two simultaneous filtered images are captured in one single frame. The object of the proposed technique is to apply the well-known helium-beam line-ratio technique to obtain from selected filtered images the two-dimensional (2D) edge plasma ne and Te. The code EIRENE was used to demonstrate that the helium emission from recycling neutrals dominates the emission for the lines of view passing close above the limiter. Since these chords are nearly parallel to magnetic field lines in the emission region, the images can be approximated to poloidal cuts of the plasma emission within the tolerances discussed in the paper. The absolute radial profiles of Te and ne obtained with the method presented here were checked in the TJ-II stellarator to be in relatively good agreement with other diagnostics within a wide range of plasma parameters for both ECRH and NBI plasmas. The method is finally used to get 2D images of edge plasma Te and ne." @default.
- W2092622496 created "2016-06-24" @default.
- W2092622496 creator A5003076029 @default.
- W2092622496 creator A5090010372 @default.
- W2092622496 date "2011-05-26" @default.
- W2092622496 modified "2023-09-28" @default.
- W2092622496 title "Two-dimensional imaging of edge plasma electron density and temperature by the passive helium emission ratio technique in TJ-II" @default.
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- W2092622496 doi "https://doi.org/10.1088/0741-3335/53/8/085006" @default.
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