Bremen 2017 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Plasma Diagnostics III

P 16.2: Fachvortrag

Wednesday, March 15, 2017, 09:00–09:25, HS 1010

Electron and heavy particle density measurements of a stable axially blown arc in argon — •Jan Carstensen, Patrick Stoller, Bernardo Galletti, Charles Doiron, and Alexey Sokolov — ABB Corporate Research, Segelhofstr. 1K, 5405 Baden-Daettwil, Switzerland

Two color spatial carrier wave interferometry was used to measure the electron density and heavy particle density in the stagnation point of a stable, axially blown arc in argon for currents of 50 A to 200 A and stagnation point pressures of 0.2 to 1.6 MPa. The high spatial resolution achieved allows the hot core of the arc to be readily distinguished from the surrounding boundary layer. The arc radius determined from the heavy particle density decreases with increasing stagnation pressure and increases with the current in good agreement with a simple theoretical model based on the work of [Lowke and Ludwig, J. Appl. Phys., 1975. 46(8)] for arc core temperatures of approximately 16,500 K. The measured electron density at the center of the arc agrees well with a prediction based on local thermodynamic equilibrium.