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Spectroscopic observation of simultaneous bi-directional reconnection outflows in a laboratory plasma
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View: Figures


Image of FIG. 1.
FIG. 1.

Swarthmore Spheromak Experiment. The prolate flux conserver is 0.4 m in diameter and 0.6 m in length. (a) Schematic showing orientation of two merging spheromaks (with calculated flux surfaces) (b) magnetic field lines measured by the probe array.

Image of FIG. 2.
FIG. 2.

Ion Doppler spectroscopy. Dynamics of line are depicted with fits to a double Gaussian model. Bi-directional jets are clearly evident at (–30 km/s and +38 km/s). Data are measured across a diameter at the midplane.

Image of FIG. 3.
FIG. 3.

IDS Abel inversion. Radial scan of total emissivity at across 10 chords. A spline fit of measured emissivity (black curve with error bars) is Abel-inverted to generate a plot of the emissivity as a function of radius (blue curve with blue band for error bars).

Image of FIG. 4.
FIG. 4.

Simulation results: (a) Global topology of the merging spheromaks and the reconnection layer that forms between them. (b) Closeup of the reconnection layer showing selected magnetic field lines (blue) and outflow vectors (red) as well as the location of the current sheet (thin shaded region).

Image of FIG. 5.
FIG. 5.

Quantitative analysis of reconnection outflows in the simulations. Note that the toroidal geometry of the plasma causes the outflows on the outboard side of the sheet (top plot) to be slower than the outflows on the inboard side (bottom plot). In both regions, however, the outflows are predominantly toroidal () and slowly evolving compared to the transient radial jets observed in the experiments.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spectroscopic observation of simultaneous bi-directional reconnection outflows in a laboratory plasma