Numerical matching of the sheath and presheath solutions for a spherical probe in radialmotion theory
The theory of positiveion collection by a probe immersed in a lowpressure plasma was reviewed and extended by Allen, Boyd, and Reynolds [Proc. Phys. Soc. 70, 297 (1957)]. For a given value of the ion current, the boundary values of the matched “nonneutral” or “sheath” solution V{sup ~}{sub nn}{sup (m)}(r; r{sub m}) were obtained from the “quasineutral” or “presheath” solution V{sup ~}{sub qn}(r) by choosing the small potential and electricfield values corresponding to some large “matching radius” r{sub m}. Here, a straightforward but efficient numerical method is presented for systematically determining an optimal value of the matching radius at which the presheath and sheath solutions are joined to yield the “matched” potential profile. Some suitable initial matching radius r{sub m1} is chosen and the related potential and electricfield values of the quasineutral solution are calculated. Using these as boundary conditions, Poisson's equation is integrated to yield the matched nonneutral solution including the corresponding potential at the probe surface. This procedure is repeated for increasing values r{sub m2}, r{sub m3},…. until the resulting potential at the probe surface becomes practically constant. The corresponding value of r{sub m} is taken as the “optimal” matching radius r{sub mo} at which the presheath andmore »
 Authors:

^{[1]};
^{[2]}
 Theoretical Physics Division, PINSTECH, P.O. Nilore, 44000 Islamabad (Pakistan)
 Association EURATOMÖAW, Institute for Theoretical Physics, University of Innsbruck, Technikerstrasse 25, A6020 Innsbruck (Austria)
 Publication Date:
 OSTI Identifier:
 22299721
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MATHEMATICAL SOLUTIONS; POISSON EQUATION; POTENTIALS; PROBES; SPHERICAL CONFIGURATION