Measurement of sheath potential by three emissive-probe methods in DC filament plasmas near a biased grid

POSTER

Abstract

Plasma potential structures are measured with an emissive probe near a negatively biased grid ($\approx -100V$, 80mm diam., 40 lines/cm) immersed in a hot filament DC discharge in Kr. Three different methods of analysis are compared: inflection point (IP), floating potential (FP) and separation point (SE) methods. The plasma device at the University of San Diego (length = 64 cm, diameter = 32 cm, source = filament DC discharge) was operated with $5 \times 10^8 < n_e <5 \times 10^9 cm^{-3}$, $1

*Thanks to National Research Foundation of Korea, funded by the Ministry of Science, ICT and Future Planning (2015M1A7A1A01002784), US DOE grant no. DE-SC00114226, NSF grant nos. 1464741, 1464838

Authors

  • In-Je Kang

    • Dept. Electrical Engineering, Hanyang University, Seoul, Republic of Korea

  • In-Sun Park

    • Dept. Electrical Engineering, Hanyang University, Seoul, Republic of Korea

  • Eugene Wackerbarth

    • Dept. Physics \& Biophysics, University of San Diego

  • Min-Keun Bae

    • Dept. Electrical Engineering, Hanyang University, Seoul, Republic of Korea

  • Noah Hershkowitz

    • Dept. Engineering Physics, University of Wisconsin-Madison
    • Dept. Engineering Physics, University of Wisconsin, Madison

  • Greg Severn

    • Dept. Physics \& Biophysics, University of San Diego

  • Kyu-Sun Chung

    • Dept. Electrical Engineering, Hanyang University, Seoul, Republic of Korea