Particle-in-cell/Monte Carlo simulation of electron and ion currents to cylindrical Langmuir probe

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00109187" target="_blank" >RIV/00216224:14310/19:00109187 - isvavai.cz</a>

Result on the web

<a href="https://onlinelibrary.wiley.com/doi/full/10.1002/ctpp.201800063?af=R" target="_blank" >https://onlinelibrary.wiley.com/doi/full/10.1002/ctpp.201800063?af=R</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/ctpp.201800063" target="_blank" >10.1002/ctpp.201800063</a>

Result language

angličtina

Original language name

Particle-in-cell/Monte Carlo simulation of electron and ion currents to cylindrical Langmuir probe

Original language description

Electron and ion currents to a cylindrical Langmuir (electrostatic) probe were calculated using the particle-in-cell/Monte Carlo (PIC/MC) self-consistent simulation for a neutral gas in the pressure range 2–3,000 Pa. The simulation enables us to calculate the probe currents even at high neutral gas pressures when the collisions of collected charged particles with neutral gas particles near the probe are important. The main aim of this paper is the calculation of probe currents at such high gas pressures and the comparison of the results with experimentally measured probe currents. Simulations were performed for two cases: (a) probes with varying radii in a non-thermal plasma with high electron temperature at low neutral gas pressure of 2 Pa (in order to verify the correctness of our simulations), and (b) probe with the radius of 10 um in the afterglow plasma with low electron temperature and a higher neutral gas pressure (up to 3,000 Pa). The electron probe currents obtained in case (a) show good agreement with those predicted by the orbital motion limited current (OMLC) theory for probes with radii up to 100 um for the given plasma conditions. At larger probe radii and/or at higher probe voltages, the OMLC theory incorrectly predicts too high an electron probe current for the plasma parameters studied. Additionally, a formula describing the spatial dependence of the electron density in the presheath in the collisionless case is derived. The simulation at higher neutral gas pressures, i.e. case (b), shows a decrease of the electron probe current with increasing gas pressure and the creation of a large presheath around the probe. The simulated electron probe currents are compared with those of measurements by other authors, and the differences are discussed.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

<a href="/en/project/LO1411" target="_blank" >LO1411: Development of Centre for low-cost plasma and nanotechnology surface modification</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Contributions to Plasma Physics

ISSN

0863-1042

e-ISSN

1521-3986

Volume of the periodical

59

Issue of the periodical within the volume

3

Country of publishing house

DE - GERMANY

Number of pages

12

Pages from-to

314-325

UT code for WoS article

000461229600005

EID of the result in the Scopus database

2-s2.0-85055953829