[Table of Contents]

Plasma and Fusion Research

Volume 9, 1202133 (2014)

Rapid Communications

Plasma Density Suppression by Electron Cyclotron Wave in Lower Hybrid Wave Driven TST-2 Spherical Tokamak Plasma
Takahiro SHINYA, Yuichi TAKASE, Charles P. MOELLER1), Takuma WAKATSUKI, Takuma INADA, Takuya OOSAKO, Hidetoshi KAKUDA, Akira EJIRI, Naoto TSUJII, Hirokazu FURUI, Junichi HIRATSUKA, Kazuhiro IMAMURA, Keishun NAKAMURA, Ayaka NAKANISHI, Masateru SONEHARA, Hiro TOGASHI, Shintaro TSUDA and Takashi YAMAGUCHI
The University of Tokyo, Kashiwa 277-8561, Japan
1)
General Atomics, San Diego, CA 92186, U.S.A.
(Received 13 May 2014 / Accepted 22 July 2014 / Published 17 September 2014)

Abstract

For successful plasma current (Ip) ramp-up by the lower hybrid wave (LHW), the plasma density must be kept at a low level. In the TST-2 Ip ramp-up experiment using the LHW, the application of the electron cyclotron wave (ECW) was found to reduce the plasma density by about 10%. This allowed for further Ip ramp-up later in the discharge.

Keywords

lower hybrid wave, electron cyclotron wave, spherical tokamak plasma, density suppression

DOI: 10.1585/pfr.9.1202133

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References

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This paper may be cited as follows:

Takahiro SHINYA, Yuichi TAKASE, Charles P. MOELLER, Takuma WAKATSUKI, Takuma INADA, Takuya OOSAKO, Hidetoshi KAKUDA, Akira EJIRI, Naoto TSUJII, Hirokazu FURUI, Junichi HIRATSUKA, Kazuhiro IMAMURA, Keishun NAKAMURA, Ayaka NAKANISHI, Masateru SONEHARA, Hiro TOGASHI, Shintaro TSUDA and Takashi YAMAGUCHI, Plasma Fusion Res. 9, 1202133 (2014).