Abstract
Evolution of a potential dip in front of an electron absorbing plate has been experimentally investigated. A potential drop of the order of Te/2 exists between the bulk plasma and the boundary of the electron space charge region where the potential minimum occurs. The dip parameters are found to obey Child's law. Necessary ion pumping is provided by the floating teflon sheet covering the back of the plate. An ion beam launched towards the plate is found to be effective to modify the dip and subsequently suppress it.
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