Statistics – Computation
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9417161g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 17161-17168.
Statistics
Computation
2
Collisionless Plasmas, Contact Potentials, Electrostatic Probes, Plasma Diagnostics, Space Plasmas, Spacecraft Charging, Computational Grids, Current Density, Debye Length, Electron Energy, Laplace Equation, Nonuniformity, Volt-Ampere Characteristics
Scientific paper
In the theory of electrostatic probes, it is usually assumed that the probe surface potential is uniform. However, nonuniformity of the surface work function produces a nonuniformity in surface potential which may modify the current collection. This effect is examined for an infinite cylinder immersed in a collisionless plasma in the limit when Debye length is much greater than probe radius, by numerically following charged-particle orbits in a Laplace potential. It is shown that only large-scale, macroscopic potential nonuniformities are important for the current collection, and that microscopic nonuniformities are smoothed over relatively short distance by the Laplace equation character of the potential.
Berthelier Jean-Jacques
Godard R.
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