Plasma Density Suppression by Electron Cyclotron Wave in Lower Hybrid Wave Driven TST-2 Spherical Tokamak Plasma

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; Takashi YAMAGUCHI

doi:10.1585/pfr.9.1202133

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Plasma Density Suppression by Electron Cyclotron Wave in Lower Hybrid Wave Driven TST-2 Spherical Tokamak Plasma

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, Takashi YAMAGUCHI

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

JOURNAL FREE ACCESS

2014 Volume 9 Pages 1202133

DOI https://doi.org/10.1585/pfr.9.1202133

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Abstract

For successful plasma current (I_p) ramp-up by the lower hybrid wave (LHW), the plasma density must be kept at a low level. In the TST-2 I_pramp-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 I_pramp-up later in the discharge.

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