INP

Leibniz Institute for Plasma Science and Technology
Felix-Hausdorff-Str. 2
17489 Greifswald
GERMANY

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The Leibniz Institute for Plasma Science and Technology (INP) is the largest non-university institute in the field of low temperature plasmas, their basics and technical applications in Europe. The institute carries out research and development from idea to prototype. The topics focus on the needs of the market. At present, plasmas for materials and energy as well as for environment and health are the focus of interest.

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Creative Commons Attribution 4.0 International (CC BY 4.0)
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Plasma parameters of microarcs towards minuscule discharge gap - Dataset

Materials / Surfaces
Thermal Plasma Technology

This dataset contains plasma parameters of microarcs generated between a cooled copper anode and a ceriated tungsten cathode by means of a one-dimensional unified non-equilibrium model for gap lengths between 15 and 200 µm and current densities from 2x10^5 up to 10^6 A/m^2. The data show that the decrease of the gap length down to a few tens of micrometers for a given current density results in a progressive shrinking of the quasineutral bulk in the microplasma and its complete disappearance. The decrease of the gap length further leads to an increase of the discharge voltage and the electron temperature, and to slightly less heating of the gas.

fluid modelling
unified description
microarc
non-equilibrium plasma
space charge
FieldValue
Group
INP
Authors
Baeva, Margarita
Release Date
2020-04-09
Identifier
81b91c12-ee67-405f-8c9b-27885f921590
Permanent Identifier (DOI)
10.34711/inptdat.180
Permanent Identifier (URI)
https://www.inptdat.de/node/180
Is supplementing
M. Baeva et al., Contrib. Plasma Phys. 60 (2020) e202000033
Plasma Source Name
mircoarc-plasma source
Plasma Source Application
additive manufacturing
microwelding
microarc oxidation
Plasma Source Specification
DC
atmospheric pressure
thermal
Plasma Source Properties

Microarc-plasma source in parallel-plate configuration including a cylindrical rod with a radius of 2 mm and a length of 20 mm made of ceriated Tungsten as the cathode and a copper anode. Current densities are varied in the range from 2x10^5 A/m^2 up to 10^6 A/m^2 and gap lengths of 15, 20, 50, 100, and 200 µm are investigated.
Plasma Source Procedure
The cathode end in contact with the plasma is heated by an effective heat flux, which includes contributions of ion bombardment and recombination, secondary and thermionic emission of electrons, plasma electrons reaching the cathode, and black-body radiation. The cathode end, which is not in a contact with the plasma, and the anode are kept at a constant temperature of 300 K.
Plasma Medium Name
Ar
Plasma Medium Properties

Gas: pure argon, no gas flow;
Pressure; atmospheric pressure;
Gas temperature: 300 to 3000 K
Plasma Diagnostics Name
fluid-Poisson model
Plasma Diagnostics Properties

Geometry: 1D
Plasma Diagnostics Procedure

The plasma is considered as a fluid containing electrons and heavy species of argon, namely ground state atoms, a group of 4s and 4p excited atoms, dimers, atomic and molecular ions, at atmospheric pressure. The computational model solves in one dimension the equations of particle and energy conservation for electrons and heavy species, the equation of heat conduction in the cathode, the Poisson equation for the electric potential, and an equation for the electric circuit, to which the electrodes are connected. Gas flow and self-induced magnetic field are not considered.
Language
English
License
Creative Commons Attribution 4.0 International (CC BY 4.0)
Public Access Level
Public
Contact Name
Baeva, Margarita
Contact Email
baeva@inp-greifswald.de

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