Assessment of Plasma-Flow Effect on Langmuir Triple-Probe Operation via Kinetic Simulation

Autor:	Chris Deline, Brian E. Gilchrist, Éric Choinière
Rok vydání:	2009
Předmět:	Physics Nuclear and High Energy Physics Debye sheath Plasma Radius Condensed Matter Physics Ion symbols.namesake Mach number Physics::Plasma Physics symbols Langmuir probe Plasma diagnostics Atomic physics Debye length
Zdroj:	IEEE Transactions on Plasma Science. 37:1843-1849
ISSN:	1939-9375 0093-3813
DOI:	10.1109/tps.2009.2025277
Popis:	A self-consistent steady-state 2-D kinetic plasma solver has been applied to the problem of Langmuir triple-probe plasma diagnostic measurements in a flowing collisionless plasma. The triple-probe response is simulated for ion Mach numbers M = 0 - 5 and probe radii rp = 1 - 90 lambdaD (Debye length). Results indicate that a high probe radius and high ion Mach numbers more closely approximate the ideal thin-sheath triple-probe response. Small probe radii on the order of the Debye length can result in temperature errors of the ideal model greater than 70% for a probe bias of 20 V. An analytical approximation is described, approximating triple-probe measurement offsets given arbitrary probe bias and probe radius and ion Mach numbers 0 < M < 5. The fitting error from this analytical approximation is estimated at 2%-6%.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ff079ce4efd0d700d596ee66a6a03d52 https://doi.org/10.1109/tps.2009.2025277 Zobrazit plný text záznamu