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Space-resolved vacuum ultraviolet spectrometer system for edge impurity and temperature profile measurement in HL-2A
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Image of FIG. 1.
FIG. 1.

Schematic view of space-resolved 1 m normal incidence VUV spectrometer system in HL-2A. The vertical view region of 400 mm is indicated by two solid lines which start at the entrance slit and end at the HL-2A plasma. The upper figure shows extension around entrance slit.

Image of FIG. 2.
FIG. 2.

Detailed structures of four space-resolved slits with different widths of 50, 100, 200, and and one open aperture mounted on a rotatable disk.

Image of FIG. 3.
FIG. 3.

Spatial resolution against space-resolved slit width as a parameter of distance between entrance slit and plasma center, d (open circles: , closed circles: , open squares: ). The present study is done with the case of to observe the radial location from plasma center to plasma edge.

Image of FIG. 4.
FIG. 4.

(a) Measured counts as a function of electron density for five different wavelengths indicated in the figure and (b) comparison of measured counts with calculated bremsstrahlung intensity as a function of electron density.

Image of FIG. 5.
FIG. 5.

Spectrometer absolute sensitivity with 1500 Å blaze grating as a function of wavelength.

Image of FIG. 6.
FIG. 6.

(a) Time-developed CV intensity profile as a function of minor radius, (b) time-developed CV emissivity profile as a function of normalized radius, and (c) intensity profiles of CIII (open triangles), CIV (open circles), CV (open squares), and OVI (closed triangles) normalized at the maximum counts.

Image of FIG. 7.
FIG. 7.

Intensity profiles of CIV as a function of minor radius in different discharge conditions (solid squares: H-mode with divertor configuration, solid triangles: L-mode with divertor configuration, open circles: Ohmic discharge with divertor configuration and open triangles: Ohmic discharge with limiter configuration).

Image of FIG. 8.
FIG. 8.

Detailed observation range of HL-2A circular plasma. The two ranges indicated by two dashed lines and two solid lines denote the observation range of CIV and , respectively.

Image of FIG. 9.
FIG. 9.

Time evolution of ion temperature from CV 2270.9 Å (solid squares) and OVII 1623.6 Å (solid circles). It should be noticed that pulse length with CV is longer than one with OVII.

Image of FIG. 10.
FIG. 10.

(a) Ion temperature profiles from CV 2270.9 Å during L- (open triangles) and H-modes (solid squares) and (b) radial profiles of CV 2270.9 Å during L- (open triangles) and H-modes (solid squares).

Image of FIG. 11.
FIG. 11.

Time behavior of electron temperature evaluated from line intensity ratio of CIII .

Image of FIG. 12.
FIG. 12.

Relative change in poloidal rotation profile measured by CV (2270 Å) Doppler shift. (a) Difference between Ohmic and L-mode with ECRH and NBI heating (open circles), (b) difference between Ohmic and H-mode with ECRH and NBI heating (open squares), and (c) difference between L-mode and H-mode (closed squares).


Generic image for table
Table I.

Relevant coefficients for the calibration curves in unit of .

Generic image for table
Table II.

Lines list for spectroscopic measurement.

Generic image for table
Table III.

Line pairs for edge measurement in VUV range.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Space-resolved vacuum ultraviolet spectrometer system for edge impurity and temperature profile measurement in HL-2A