Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 6: Atmospheric Plasmas and their Applications II

P 6.1: Hauptvortrag

Dienstag, 1. April 2025, 11:00–11:30, ZHG006

Spatially and temporally resolved electric fields in an RF-APPJ measured by E-FISH — •Inna Orel¹, Nikita Lepikhin¹, Zoltan Donko², Dirk Luggenhölscher¹, and Uwe Czarnetzki¹ — ¹Ruhr University Bochum, Institute for Plasma and Atomic Physics, Bochum, Germany — ²Institute for Solid State Physics and Optics HUN REN Wigner Research Centre for Physics, Budapest, Hungary

Spatially and temporally resolved electric fields in a self-sustained radio frequency atmospheric plasma jet (RF-APPJ) in a helium:nitrogen mixture are measured by electric field induced second harmonic generation (E-FISH). It is shown that the electric field in the bulk of the RF-APPJ is unexpectedly high, having an amplitude of about 1.6 kV/cm, and that it exhibits a phase shift of approximately −0.2π relative to the voltage waveform [1]. The electron density in the bulk is estimated from the measured phase shift between the electric field and the applied voltage by using an equivalent RC-circuit model for the discharge. Comparison of the measured electric field with the results of ab initio Particle-in-Cell/Monte Carlo collisions (PIC/MCC) simulations reveals excellent agreement. Special attention is paid to the calibration of the E-FISH measurement which includes removal of polarity sensitive artifacts.

The work is supported by the DFG funded SFB1316 Project "Transient atmospheric plasmas - from plasmas to liquids to solids".

[1] I Orel et al 2025, submitted to Plasma Sources Sci. Technol.

Keywords: helium/nitrogen plasma; E-FISH; electric field; RF-APPJ; COST-jet