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Ion flow measurements and plasma current analysis in the Irvine Field Reversed Configuration
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Image of FIG. 1.
FIG. 1.

Coil geometry and principal diagnostics (time-of-flight diagnostic not to scale).

Image of FIG. 2.
FIG. 2.

Gaussian fit performed over an average of five shots looking at at . Here, and .

Image of FIG. 3.
FIG. 3.

Current through the (a) limiter coil, (b) flux coil, and (c) total plasma current. Axial magnetic field (d) at the midplane on the outermost radius (solid) and innermost radius (dashed). Line integrated density (e) measured on a similar discharge. Standard plasma shot with 5.4 kV on the flux coil, 1.4 kV on the limiter coil, and 16 kV on the plasma guns.

Image of FIG. 4.
FIG. 4.

Ion saturation current at various radii with standard charging parameters.

Image of FIG. 5.
FIG. 5.

(a) Radial magnetic field profile at the midplane for a typical shot. Only seven probes are shown for clarity. (b) The interpolated null surface vs time.

Image of FIG. 6.
FIG. 6.

Charge-exchange neutral particle velocity distribution uncorrected (dashed) and corrected (solid) for detection efficiency and charge exchange cross section energy dependence. Time averaged over for a standard plasma shot.

Image of FIG. 7.
FIG. 7.

Neutral flux measurements looking in the cocurrent and countercurrent directions (solid). Cartoon indicating that peak of data lies below minimum detectable energy (dashed). Data shown are taken at for a typical shot.

Image of FIG. 8.
FIG. 8.

Argon data with a Gaussian fit (solid) observed in the countercurrent direction showing a blueshift. The unshifted Gaussian (dashed) is shown for comparison.

Image of FIG. 9.
FIG. 9.

Gaussian fit giving the mean PMT channel number observed in the cocurrent (△) and countercurrent (◇) directions. Error bars are calculated from the shot to shot variation in the discharges.

Image of FIG. 10.
FIG. 10.

Average Doppler shift for observed spectral lines. Ion lines shown in (a) are carbon (solid), argon (dotted), and krypton (dashed). Neutral emission lines (b) are helium (solid) and hydrogen (dotted).

Image of FIG. 11.
FIG. 11.

Effective temperatures for observed spectral lines: hydrogen (dashed-dot-dot-dot), helium (dashed-dot), carbon (solid), argon (dotted), and krypton (dashed).

Image of FIG. 12.
FIG. 12.

Electron temperature as determined by the ratio of to . Error bars from statistical deviation of intensity between multiple shots.

Image of FIG. 13.
FIG. 13.

Density profile obtained from pressure balance at while plasma is stable with the condition that the density goes to zero at the boundary.

Image of FIG. 14.
FIG. 14.

Equilibrium fit to data for a typical shot to obtain equilibrium parameters at .

Image of FIG. 15.
FIG. 15.

Equilibrium density profile using fitted parameters (solid) during a stable portion of the discharge along with the profile calculated from pressure balance (dashed) and ion-saturation current (×) scaled for reference.

Image of FIG. 16.
FIG. 16.

Ion currents using density profiles obtained from pressure balance (dashed) and fitting to the equilibrium model (solid). Total plasma current shown (dotted) for comparison.

Image of FIG. 17.
FIG. 17.

Electron rotation frequencies calculated from particle drifts (solid) and using the integrated density distributions obtained from the equilibrium model fit (dotted) and pressure balance (dashed).


Generic image for table
Table I.

Lines analyzed.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ion flow measurements and plasma current analysis in the Irvine Field Reversed Configuration