Analog Plasma Diagnostic System
- 1 February 1972
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 43 (2) , 248-250
- https://doi.org/10.1063/1.1685604
Abstract
The simple electronic diagnostic system described provides a calibrated oscilloscope display of a Langmuir probeI‐Vcharacteristic, its first and second derivative curves, the electron energy distribution function, and the ``cumulative'' electron number density. The system also provides a simple method for determining plasma potential and—if it exists—the electron temperature. Data taken in a low temperaturemercury discharge are compared with data taken by means of the well known harmonic second derivative technique. An electron number density of 4.9×1016 m−3 and an electron temperature of 9.7×103 K found with the new system compare very favorably to values of 4.7×1016 m−3 and 9.9×103 K determined from the harmonic second derivative data. The system described features more rapid data reduction and lower cost than harmonic systems.Keywords
This publication has 4 references indexed in Scilit:
- Simple Circuit for Obtaining the Electron Energy Distribution in a PlasmaJournal of Applied Physics, 1969
- Probe Contamination in a Hydrogen Plasma†Journal of Electronics and Control, 1963
- Automatic Plotting Device for the Second Derivative of Langmuir Probe CurvesReview of Scientific Instruments, 1963
- Der NiedervoltbogenThe European Physical Journal A, 1930