Electron Density Measurements of Non-Inductive Start-Up Plasmas in the TST-2 Spherical Tokamak

Hiroki KURASHINA; Akira EJIRI; Yuichi TAKASE; Kentaro HANASHIMA; Takuya SAKAMOTO; Osamu WATANABE; Yoshihiko NAGASHIMA; Takashi YAMAGUCHI; Byung Il AN; Hiroaki KOBAYASHI; Hiroyuki HAYASHI; Kotaro YAMADA; Hazuki MATSUZAWA; Hidetoshi KAKUDA; Junichi HIRATSUKA; Takuma WAKATSUKI; Takuya OOSAKO

doi:10.1585/pfr.5.024

Rapid Communications

Electron Density Measurements of Non-Inductive Start-Up Plasmas in the TST-2 Spherical Tokamak

Hiroki KURASHINA, Akira EJIRI, Yuichi TAKASE, Kentaro HANASHIMA, Takuya SAKAMOTO, Osamu WATANABE, Yoshihiko NAGASHIMA, Takashi YAMAGUCHI, Byung Il AN, Hiroaki KOBAYASHI, Hiroyuki HAYASHI, Kotaro YAMADA, Hazuki MATSUZAWA, Hidetoshi KAKUDA, Junichi HIRATSUKA, Takuma WAKATSUKI, Takuya OOSAKO

Author information

Hiroki KURASHINA
The University of Tokyo, Kashiwa 277-8561, Japan
Akira EJIRI
The University of Tokyo, Kashiwa 277-8561, Japan
Yuichi TAKASE
The University of Tokyo, Kashiwa 277-8561, Japan
Kentaro HANASHIMA
The University of Tokyo, Kashiwa 277-8561, Japan
Takuya SAKAMOTO
The University of Tokyo, Kashiwa 277-8561, Japan
Osamu WATANABE
The University of Tokyo, Kashiwa 277-8561, Japan
Yoshihiko NAGASHIMA
The University of Tokyo, Kashiwa 277-8561, Japan
Takashi YAMAGUCHI
The University of Tokyo, Kashiwa 277-8561, Japan
Byung Il AN
The University of Tokyo, Kashiwa 277-8561, Japan
Hiroaki KOBAYASHI
The University of Tokyo, Kashiwa 277-8561, Japan
Hiroyuki HAYASHI
The University of Tokyo, Kashiwa 277-8561, Japan
Kotaro YAMADA
The University of Tokyo, Kashiwa 277-8561, Japan
Hazuki MATSUZAWA
The University of Tokyo, Kashiwa 277-8561, Japan
Hidetoshi KAKUDA
The University of Tokyo, Kashiwa 277-8561, Japan
Junichi HIRATSUKA
The University of Tokyo, Kashiwa 277-8561, Japan
Takuma WAKATSUKI
The University of Tokyo, Kashiwa 277-8561, Japan
Takuya OOSAKO
The University of Tokyo, Kashiwa 277-8561, Japan

Keywords: spherical tokamak, electron cyclotron heating, plasma start-up, electron density, microwave interferometer

JOURNAL FREE ACCESS

2010 Volume 5 Pages 024

DOI https://doi.org/10.1585/pfr.5.024

Details

Abstract

A new 50 GHz microwave interferometer was installed, and non-inductively sustained spherical tokamak plasmas in the TST-2 device were measured. The line integrated electron densities (n_els) on five chords were compared with visible CCD camera image and equilibrium analysis. It is concluded that the high-density region has a C-like shape along the outboard boundary. This shape suggests that the electron density is not constant on the magnetic flux surface.

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