Plasma and Fusion Research

Volume 14, 2402063 (2019)

Regular Articles

Evaluation of Electron Temperature and Density Using Ion Sensitive Probes on Open Field Plasma in the End-Region of GAMMA 10/PDX
Yosuke KINOSHITA, Naomichi EZUMI, Kunpei NOJIRI, Takaaki IIJIMA, Akihiro TERAKADO, Tomohiro MIKAMI, Satoshi TOGO, Kaede KOBAYASHI, Mizuki SAKAMOTO, Yousuke NAKASHIMA, Junko KOHAGURA, Masayuki YOSHIKAWA, Hirohiko TANAKA1) and Suguru MASUZAKI2)
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
1)
Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
2)
National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
(Received 30 September 2018 / Accepted 5 January 2019 / Published 8 April 2019)

Abstract

Ion sensitive probe (ISP) enables simultaneous measurement of ion temperature, electron temperature, and density. So far, we have observed a difference between electron temperature, and density data obtained using ISP and Langmuir probe (LP) in divertor experimental module of GAMMA 10/PDX. To clarify the difference observed, in this study comparisons of two kinds of ISPs are performed. In Type-I ISP, in which guard electrode is aligned with outer dielectric tube, shows an influence of temperature anisotropy on the electron temperature measurement. The electron density detected using Type-I ISP is considerably smaller than the one detected using LP. In the case of Type-II ISP, in which the guard electrode protrudes from the outer dielectric tube, the electron temperature and density detected are similar to the data obtained using LP. Furthermore, the discovered effects of hydrogen (H2) gas pressure change are presented here.

Keywords

ion sensitive probe, electron temperature measurement, electron density measurement, GAMMA 10/PDX, divergent magnetic field

DOI: 10.1585/pfr.14.2402063

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