Premium
Accurate measurement of the ion saturation current collected by a cylindrical Langmuir probe in cold plasmas
Author(s) -
DíazCabrera Juan Manuel,
Fernández Palop José I.,
Regodón Guillermo F.,
Ballesteros Jerónimo
Publication year - 2020
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.202000073
Subject(s) - langmuir probe , neon , atomic physics , ion , plasma , argon , ion current , helium , current (fluid) , plasma diagnostics , electron temperature , chemistry , physics , thermodynamics , nuclear physics , organic chemistry
This paper analyzes the results of accurate measurements of the ion current collected by a cylindrical Langmuir probe immersed in cold argon, neon, and helium plasmas. These measurements make it possible to study the influence of the positive ion‐to‐electron temperature ratio β = T + / T e on the collected ion current, providing valuable information about the trajectory described by the positive ions when falling toward the probe. Several criteria have been applied to discriminate whether the ion current is described by using the orbital motion limited theory or the radial motion theory. In all the studied argon and neon plasma discharge conditions, the criteria indicate that the positive ion current collected by the probe is appropriately described by the radial motion theory; however, as β increases, some criteria indicate a trend toward the orbital theory. In contrast, for the studied helium plasmas discharge conditions, a transition from radial to orbital motion has been measured.