A method for measuring fast time evolutions of the plasma potential by means of a simple emissive probe
- 1 November 1981
- journal article
- Published by IOP Publishing in Journal of Physics E: Scientific Instruments
- Vol. 14 (11), 1291-1295
- https://doi.org/10.1088/0022-3735/14/11/017
Abstract
A method is presented for obtaining the temporal evolution of the plasma potential, which is assumed to be given by the floating potential of a simple emissive probe. The construction of the probe is also described. The method avoids the slow time response of the usual technique where the floating potential is measured across a high resistance. During each sweep of the probe voltage, the changing of the sign of the probe current, which is sampled at a specific time, gives rise to a negative pulse, driving the pen-lift of an X-Y recorder. Since the real floating potential is measured where the probe current is zero, the disturbance of the plasma is kept as low as possible.Keywords
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