Theory of a cylindrical Langmuir probe parallel to the magnetic field and its calibration with interferometry

A theory for data interpretation is presented for a cylindrical Langmuir probe in plasma parallel to the magnetic field direction. The theory is tested in a linear low-temperature plasma device Aline, in a capacitive radio-frequency (RF) discharge. The probe is placed on a 3D manipulator, and a posi...

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Bibliographic Details
Published in:Review of scientific instruments 2018-10, Vol.89 (10), p.10J124-10J124
Main Authors: Usoltceva, M., Faudot, E., Ledig, J., Devaux, S., Heuraux, S., Zadvitskiy, G. V., Ochoukov, R., Moritz, J., Crombé, K., Noterdaeme, J.-M.
Format: Article
Language:English
Subjects:
Cylindrical plasmas
Magnetic fields
Physics
Plasma
Plasma Physics
Radio frequency
Scientific apparatus & instruments
Sheaths
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Summary:A theory for data interpretation is presented for a cylindrical Langmuir probe in plasma parallel to the magnetic field direction. The theory is tested in a linear low-temperature plasma device Aline, in a capacitive radio-frequency (RF) discharge. The probe is placed on a 3D manipulator, and a position scan is performed. To exclude strong RF perturbations, the probe is RF compensated. Using the theory, electron densities are obtained from the current at the plasma potential, where no sheath is present. Results are calibrated by line-integrated density measurements of a 26.5 GHz microwave interferometer. Reasonable agreement is observed for probe and interferometer measurements. Furthermore, preceding, more general probe theory is compared to the one developed in the current work and the application limits are discussed.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5038666