High-impedance capacitive divider probe for potential measurements in plasmas

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Abstract

It is often desirable, though difficult, to measure electric potential changes within a plasma, including variations due to waves and fluctuations. For a broad range of plasma parameters ac floating potential measurements may be made using the high input impedance probe described in this paper. A capacitive divider with an active buffer circuit is incorporated, such that a 50-Ω line can be driven with a 60-dB dynamic range and 100-MHz bandwidth. Details of the electronic circuit, mechanical construction, and calibration of the probe are given, together with a discussion of the parameter range over which successful measurements may be made.

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Benjamin, N. (1982). High-impedance capacitive divider probe for potential measurements in plasmas. Review of Scientific Instruments, 53(10), 1541–1543. https://doi.org/10.1063/1.1136832

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