Radial current-density distributions and sample charge uniformity in a corona triode

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Abstract
Reports on the radial distribution of the current density produced by a corona triode using the metallic point placed in the axis of insulating tubing. The experimental results are fitted with a model, accounting for the space charge in the grid-to-plate gap, and the corona wind. For a small grid bias, the simulation yields a current-density distribution similar to that of the corona-wind velocity. Using a proper feedback control of the grid bias, the charging current can be kept constant, and the resulting charge distribution is almost uniform. The evolutions of the surface charge patterns obtained with and without feedback control of the grid bias are compared.