[Table of Contents]

Plasma and Fusion Research

Volume 5, 024 (2010)

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 and Takuya OOSAKO
The University of Tokyo, Kashiwa 277-8561, Japan
(Received 1 May 2010 / Accepted 29 May 2010 / Published 7 July 2010)

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 (nels) 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.

Keywords

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

DOI: 10.1585/pfr.5.024

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This paper may be cited as follows:

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 and Takuya OOSAKO, Plasma Fusion Res. 5, 024 (2010).