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Plasma Potential Measurement in Detached Plasmas by Emissive Probe Considering Space-Charge-Limited Effect

Shogo HATTORI, Hirohiko TANAKA, Shin KAJITA¹⁾ and Noriyasu OHNO

Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

1)

IMaSS, Nagoya University, Nagoya 464-8603, Japan

(Received 2 July 2020 / Accepted 11 October 2020 / Published 19 November 2020)

Abstract

The accuracy for the measurement of the plasma potential was improved using an emissive probe (EP) considering the space-charge-limited (SCL) effect. To validate the measurement method, the plasma potential measured using a method combining double probe (DP) and single probe (SP) was compared to the developed method. The two measurement methods showed a good agreement: it was confirmed that the EP considering the SCL effect was able to measure the plasma potential accurately even in detached plasmas with a high-temporal-resolution.

Copyright (c) 2020 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

detached plasma, plasma potential, emissive probe, double probe, space-charge-limited effect

DOI: 10.1585/pfr.15.1301082

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