Characteristics of the Plasma Source for Ground Ionosphere Simulation Surveyed by Disk-Type Langmuir Probe

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A space plasma facility has been operated with a back-diffusion-type plasma source installed in a mid-sized vacuum chamber with a diameter of similar to 1.5 m located in Satellite Technology Research Center (SaTReC), Korea Advanced Institute of Science and Technology (KAIST). To generate plasma with a temperature and density similar to the ionospheric plasma, nickel wires coated with carbonate solution were used as filaments that emit thermal electrons, and the accelerated thermal electrons emitted from the heated wires collide with the neutral gas to form plasma inside the chamber. By using a disk-type Langmuir probe installed inside the vacuum chamber, the generation of plasma similar to the space environment was validated. The characteristics of the plasma according to the grid and plate anode voltages were investigated. The grid voltage of the plasma source is realized as a suitable parameter for manipulating the electron density, while the plate voltage is suitable for adjusting the electron temperature. A simple physical model based on the collision cross-section of electron impact on nitrogen molecule was established to explain the plasma generation mechanism.
Publisher
KOREAN SPACE SCIENCE SOC
Issue Date
2017-12
Language
English
Article Type
Article
Citation

JOURNAL OF ASTRONOMY AND SPACE SCIENCES, v.34, no.4, pp.343 - 351

ISSN
2093-5587
DOI
10.5140/JASS.2017.34.4.343
URI
http://hdl.handle.net/10203/240121
Appears in Collection
RIMS Journal PapersPH-Journal Papers(저널논문)
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