Design, Development, and Application of a Complete Analog Plasma-Diagnostic System.
SYSTEMS RESEARCH LABS INC DAYTON OHIO
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The simple electronic diagnostic system described provides a calibrated oscilloscope display of a Langmuir-probe I-V characteristic, 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-temperature mercury discharge is compared with data taken by means of the well-known harmonic second-derivative technique. An electron number density of 4.9 x 10 to the 16th powercubic meter and an electron temperature of 9,700 degrees K found with the new system compare very favorably to values of 4.7 x 10 to the 16th powercubic meter and 9900 degrees K determined from the harmonic second-derivative data. The system described features more rapid data reduction and lower cost than existing harmonic systems. A detailed design procedure for construction of the accurate differentiators is given. Author
- Test Facilities, Equipment and Methods
- Plasma Physics and Magnetohydrodynamics