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Tungsten injector for scrape-off layer impurity transport experiments in the Tore Supra tokamak
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View: Figures


Image of FIG. 1.
FIG. 1.

The dependence of the saturated vapor pressure of W(CO) on temperature, measured in different experiments (—— Landold and Börnstein, — — Chellappa and Chandra, Lander and Germer ).

Image of FIG. 2.
FIG. 2.

(a) Cutaway view of Tore Supra with one of the two reciprocating manipulators. (b) Poloidal cross section of the Tore Supra plasma facing components and the last closed flux surface (LCFS) defined by the toroidal pump limiter (TPL) in the discharge #48183. Also indicated is the injector location and the line of sight (LOS) of the VUV spectrometer.

Image of FIG. 3.
FIG. 3.

Exploded decomposition of the injector. The numbers identify components described in the text. Cable connections of the Langmuir probes and the thermocouples are not shown.

Image of FIG. 4.
FIG. 4.

Photograph of the final injector assembly. Kapton foils are used to secure the cable connections and facilitate the injector insertion into the housing. The leading edge of the graphite housing is shown on lower right.

Image of FIG. 5.
FIG. 5.

Number of injected W(CO) molecules as a function of the injector temperature. Full curve is obtained from Eqs. (1) and (2) . Experimental data are obtained from Eq. (5) .

Image of FIG. 6.
FIG. 6.

Injection of W(CO) into the empty vacuum vessel (Tore Supra experiment #48127). (Top) Elevation of the injector nozzle. Inset panels show details of , = / and = / near the turning point of the stroke. Red cross indicates the valve opening time = 5.156 s. (Bottom) The pressure inside the vacuum vessel. The increase in the torus pressure Δ and Δ is used to estimate the number of injected W(CO) molecules (see text).

Image of FIG. 7.
FIG. 7.

W injections in the plasma discharge #48183. (Top) Time evolution of the W emission measured by the VUV spectrometer, averaged over the wavelengths of 4.8–5.4 nm (W quasicontinuum). Also plotted is the time evolution of the injector elevation with six strokes. (Bottom) Time evolution of the spectrometer signal around 5 nm. Inset shows the spectral features of the W quasicontinuum measured at = 9.31 s.

Image of FIG. 8.
FIG. 8.

(Top) Time evolution of the torus pressure during injection of W(CO) without the plasma. Spikes correspond to series of W(CO) injections. Also indicated is the number of injections per series. (Bottom) Injector temperature measured by one of the embedded thermocouples.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tungsten injector for scrape-off layer impurity transport experiments in the Tore Supra tokamak