Measurement of electron density in low density plasmas from the electron accelerating region characteristics of cylindrical Langmuir probes

Details Measurement of electron density in low density plasmas from the electron accelerating region characteristics of cylindrical Langmuir probes Measurement of electron density in low density plasmas from the electron accelerating region characteristics of cylindrical Langmuir probes

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22.1585g&link_type=abstract

Planetary and Space Science, vol. 22, Dec. 1974, p. 1585-1596.

Computer Science

Sound

3

Electron Density (Concentration), Electrostatic Probes, Ionospheric Sounding, Plasma Diagnostics, Rarefied Plasmas, Afterglows, Cylindrical Bodies, Ionospheric Electron Density, Particle Acceleration, Rocket Sounding, Volt-Ampere Characteristics

Scientific paper

Measurements carried out using a cylindrical Langmuir probe operated in the electron accelerating region of the current-voltage characteristics under orbital limited conditions in low density plasmas, show the response of the probe to be in good agreement with Langmuir theory. By making observations in three different plasmas, namely a steady state plasma, an afterglow plasma and the ionospheric plasma it is confirmed that the form of the orbital limited characteristics of the probe is independent of the energy distribution of the electrons in the plasma. Comparative measurements of ionospheric electron densities made between a rocket borne cylindrical probe and a ground based ionosonde show good agreement to exist and thus demonstrate that the probe operated in this mode not only overcomes the significant problems associated with retarding region probe measurements but affords an accurate determination of electron density. This underlines the usefulness of this kind of probe for electron density measurements in plasmas where the energy distribution of the electrons is unknown.

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