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(Color online) Sketch of the helicon source with the spatially resolved TALIF diagnostic.
(a) Neutral depletion as a function of radius, where squares, diamonds, and circles correspond to 0, 95, and , respectively. (b) Plasma pressure (squares) and neutral pressure (circles) as a function of radius, the solid line being the sum of the two. The data points are measured from and mirrored around 0 for clarity.
Plasma pressure (squares) and neutral pressure (diamonds) as a function of (a) rf power and (b) fill pressure. The solid lines are the sum of the two pressures and the dotted line is the pressure at the wall measured by the baratron.
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