Direct Measurements of High Harmonic Fast Wave Profile in the UTST Spherical Tokamak Plasma

Takuma WAKATSUKI; Yoshihiko NAGASHIMA; Takuya OOSAKO; Hiroaki KOBAYASHI; Byung Il AN; Hidetoshi KAKUDA; Takuma YAMADA; Ryota IMAZAWA; Osamu WATANABE; Takashi YAMAGUCHI; Hiroki KURASHINA; Hiroyuki HAYASHI; Kotaro YAMADA; Takuya SAKAMOTO; Kentaro HANASHIMA; Junichi HIRATSUKA; Shuji KAMIO; Ryuma HIHARA; Keita ABE; Morio SAKUMURA; Qinghong CAO; Michiaki INOMOTO; Yasushi ONO; Akira EJIRI; Yuichi TAKASE

doi:10.1585/pfr.5.018

Rapid Communications

Direct Measurements of High Harmonic Fast Wave Profile in the UTST Spherical Tokamak Plasma

Takuma WAKATSUKI, Yoshihiko NAGASHIMA, Takuya OOSAKO, Hiroaki KOBAYASHI, Byung Il AN, Hidetoshi KAKUDA, Takuma YAMADA, Ryota IMAZAWA, Osamu WATANABE, Takashi YAMAGUCHI, Hiroki KURASHINA, Hiroyuki HAYASHI, Kotaro YAMADA, Takuya SAKAMOTO, Kentaro HANASHIMA, Junichi HIRATSUKA, Shuji KAMIO, Ryuma HIHARA, Keita ABE, Morio SAKUMURA, Qinghong CAO, Michiaki INOMOTO, Yasushi ONO, Akira EJIRI, Yuichi TAKASE

著者情報

Takuma WAKATSUKI
The University of Tokyo, Tokyo 113-0033, Japan
Yoshihiko NAGASHIMA
The University of Tokyo, Tokyo 113-0033, Japan
Takuya OOSAKO
The University of Tokyo, Tokyo 113-0033, Japan
Hiroaki KOBAYASHI
The University of Tokyo, Tokyo 113-0033, Japan
Byung Il AN
The University of Tokyo, Tokyo 113-0033, Japan
Hidetoshi KAKUDA
The University of Tokyo, Tokyo 113-0033, Japan
Takuma YAMADA
The University of Tokyo, Tokyo 113-0033, Japan
Ryota IMAZAWA
The University of Tokyo, Tokyo 113-0033, Japan
Osamu WATANABE
The University of Tokyo, Tokyo 113-0033, Japan
Takashi YAMAGUCHI
The University of Tokyo, Tokyo 113-0033, Japan
Hiroki KURASHINA
The University of Tokyo, Tokyo 113-0033, Japan
Hiroyuki HAYASHI
The University of Tokyo, Tokyo 113-0033, Japan
Kotaro YAMADA
The University of Tokyo, Tokyo 113-0033, Japan
Takuya SAKAMOTO
The University of Tokyo, Tokyo 113-0033, Japan
Kentaro HANASHIMA
The University of Tokyo, Tokyo 113-0033, Japan
Junichi HIRATSUKA
The University of Tokyo, Tokyo 113-0033, Japan
Shuji KAMIO
The University of Tokyo, Tokyo 113-0033, Japan
Ryuma HIHARA
The University of Tokyo, Tokyo 113-0033, Japan
Keita ABE
The University of Tokyo, Tokyo 113-0033, Japan
Morio SAKUMURA
The University of Tokyo, Tokyo 113-0033, Japan
Qinghong CAO
The University of Tokyo, Tokyo 113-0033, Japan
Michiaki INOMOTO
The University of Tokyo, Tokyo 113-0033, Japan
Yasushi ONO
The University of Tokyo, Tokyo 113-0033, Japan
Akira EJIRI
The University of Tokyo, Tokyo 113-0033, Japan
Yuichi TAKASE
The University of Tokyo, Tokyo 113-0033, Japan

キーワード: High Harmonic Fast Wave (HHFW), spherical tokamak

ジャーナルフリー

2010 年 5 巻 p. 018

DOI https://doi.org/10.1585/pfr.5.018

詳細

抄録

The spatial distribution of the radiofrequency (RF) magnetic field associated with a high harmonic fast wave (HHFW) was measured using an array of magnetic probes in the plasma inside the University of Tokyo Spherical Tokamak (UTST). Data obtained from 25 probes (19 locations for toroidal polarization and 6 locations for vertical polarization) distributed along the poloidal cross section were analyzed. The RF magnetic field is polarized in the toroidal direction, indicating that the HHFW is excited in the plasma. The RF field is weak on the inboard side. Analysis of the group delay suggests that the waves travel long distances in the plasma, probably because of poor absorption. No indication of parametric decay was observed up to 80 kW of injected RF power.

責任著者(Corresponding author)

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