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(Color online) Unfolded view of the target with arrangement of Langmuir probe and local optical measurement. The actual light paths were in a plane perpendicular to the target.
(Color online) Influence of peak current density and Ar pressure on the discharge: (a) and (e) Jd = 0.75 A cm−2, PAr = 0.17 Pa; (b) and (f) Jd = 7.5 Acm−2, PAr = 0.17 Pa; (c) and (g) Jd = 7.5 A cm−2, PAr = 1.0 Pa; and (d) and (h) Jd = 7.5 A cm−2, PAr = 1.7 Pa. Upper row: fast photography frames (false color), lower row: total light intensity vs azimuthal angle corresponding to a circle along the centre of the racetrack. Angle is counted clockwise.
Signals from optical fibers and the floating potential measured by electrostatic probe at Jd = 7.5 A cm−2, PAr = 1.7 Pa. Corresponding features in both fibers are marked with a dotted line.
Influence of gas pressure at a peak current of 150 A (7.5 A cm−2) on the parameters of the rotating structures. The wavelength was calculated by dividing velocity by frequency.
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