Electron Density Profile Behavior during SMBI Measured with AM Reflectometer in Heliotron J Plasma

Kiyofumi MUKAI; Kazunobu NAGASAKI; Tohru MIZUUCHI; Vladimir ZHURAVLEV; Shinsuke OHSHIMA; Takeshi FUKUDA; Takashi MINAMI; Hiroyuki OKADA; Shinji KOBAYASHI; Satoshi YAMAMOTO; Yuji NAKAMURA; Kiyoshi HANATANI; Shigeru KONOSHIMA; Masaki TAKEUCHI; Koji MIZUNO; Hyunyong LEE; Fumimichi SANO

doi:10.1585/pfr.6.1402111

Regular Articles

Electron Density Profile Behavior during SMBI Measured with AM Reflectometer in Heliotron J Plasma

Kiyofumi MUKAI, Kazunobu NAGASAKI, Tohru MIZUUCHI, Vladimir ZHURAVLEV, Shinsuke OHSHIMA, Takeshi FUKUDA, Takashi MINAMI, Hiroyuki OKADA, Shinji KOBAYASHI, Satoshi YAMAMOTO, Yuji NAKAMURA, Kiyoshi HANATANI, Shigeru KONOSHIMA, Masaki TAKEUCHI, Koji MIZUNO, Hyunyong LEE, Fumimichi SANO

Author information

Kiyofumi MUKAI
Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011, Japan
Kazunobu NAGASAKI
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
Tohru MIZUUCHI
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
Vladimir ZHURAVLEV
RRC “Kurchatov Institute”, Institute of Nuclear Fusion, Moscow 123182, Russia
Shinsuke OHSHIMA
Pioneering Research Unit for Next Generation, Kyoto University, Gokasho, Uji 611-0011, Japan
Takeshi FUKUDA
Center for Atomic and Molecular Technologies, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan
Takashi MINAMI
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
Hiroyuki OKADA
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
Shinji KOBAYASHI
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
Satoshi YAMAMOTO
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
Yuji NAKAMURA
Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011, Japan
Kiyoshi HANATANI
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
Shigeru KONOSHIMA
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
Masaki TAKEUCHI
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
Koji MIZUNO
Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011, Japan
Hyunyong LEE
Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011, Japan
Fumimichi SANO
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan

Keywords: density profile, reflectometer, SMBI, fueling control, particle confinement, Heliotron J

JOURNAL FREE ACCESS

2011 Volume 6 Pages 1402111

DOI https://doi.org/10.1585/pfr.6.1402111

Details

Abstract

The electron density profile was measured using a microwave amplitude modulation (AM) reflectometer in Heliotron J plasmas, where plasma performance was improved using supersonic molecular beam injection (SMBI) as a fueling method. Immediately after the SMBI pulse, for the case in which the supersonic molecular beam penetrates deeply, the density profile rapidly peaks, and the electron density increases in both core and edge regions. Afterward, while the line-averaged electron density is monotonically increasing, the density profile becomes more peaked. In this phase, the edge electron density measured by a Langmuir probe decreases and the peaking factor of the SX profiles measured by an absolute extreme ultraviolet array increases. These trends are consistent with the electron density trend determined by the AM reflectometer. SMBI affects particle confinement and transport, thus possibly increasing plasma stored energy.

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