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Plasma diffusion across a magnetic field observed by collective light scattering: Experimental evidence for Lévy stable distributions
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Image of FIG. 1.
FIG. 1.

DFL3: optical bench. Top left: the laser. The primary beam crosses the LO reference beam, materialized by the dotted line, with a tunable angle. This angle is divided by 10, thanks to a telescope. The part of the light scattered from the plasma (right) toward the detector (bottom) adds to the LO beam.

Image of FIG. 2.
FIG. 2.

DFL3: Collective scattering implementation in the toroidal plasma. The two laser beams are sketched as cylinders limited by two full lines (primary beam) and two dotted lines (LO beam). The angle is deliberately exaggerated on the figure. The displacement axis of the movable probe is also shown as the vertical dotted line. This probe is situated in a different toroidal section, it is the projection along the toroidal magnetic-field lines of the probe motion axis that is shown.

Image of FIG. 3.
FIG. 3.

The static form factor in absolute units and semilog (decimal) scale for a plasma with a pure toroidal magnetic field (, on the left) and when a small vertical magnetic field is added (, on the right). (red circled “X” dots), (orange “+” dots), (green “” dots), (blue circled “+” dots) and (violet “X” dots).

Image of FIG. 4.
FIG. 4.

Scattered light spectra for (above), plasma potential and plasma density space distribution (middle and lower plot) from a probe moving along a vertical cord crossing the tore equatorial axis. Left part: plasma with pure toroidal magnetic field, . Right part: plasma with an additional vertical magnetic field, .

Image of FIG. 5.
FIG. 5.

vs for different . .

Image of FIG. 6.
FIG. 6.

as a function of . , 10, 15, 20, and . .

Image of FIG. 7.
FIG. 7.

Left: vs (line and markers) at different times: , 5, 10, 15, 20, 25, 30, 35, and for . A linear fit is plotted for (, bottom) and for (, top). Right: Idem for at an expanded scale.

Image of FIG. 8.
FIG. 8.

Parameters from the linear fit on vs : (top) and (bottom) vs time for 0.28, (blue circled “+” dots) 0.34, and (violet “+” dots) .

Image of FIG. 9.
FIG. 9.

The slope of the linear fit of , , vs time for (orange), (blue), and (violet). A linear fit is plotted for .


Generic image for table
Table I.

(not normalized) from the fit of with a parabola or a straight line for and . The best fit has the smallest . For the best fit is always linear.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Plasma diffusion across a magnetic field observed by collective light scattering: Experimental evidence for Lévy stable distributions