First measurement of electron temperature and density profiles for spherical tokamak plasmas sustained by lower hybridwaves

Hiro Togashi, Akira Ejiri, Hiroto Homma, Takahiro Shinya, Yuichi Takase, Kazuya Toida, Naoto Tsujii, Takashi Yamaguchi, Yusuke Yoshida, Makoto Hasegawa, Yoshihiko Nagashima, Hirokazu Furui, Kenta Nakamura, Wataru Takahashi, Toshihiro Takeuchi, Masateru Sonehara, Satoru Yajima, Hibiki Yamazaki

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

In this research, the profiles of electron temperature Te and density ne for a spherical tokamak with the plasma current sustained by lower hybrid waves alone have been measured for the first time using Thomson scattering diagnostics in the TST-2 spherical tokamak device. The Te profile was hollow and the ne profile was like bell-shaped. Te and ne near the plasma center were 6 eV and 6 × 1017 m-3, respectively, leading to a pressure of 0.6 Pa. On the other hand, whole pressure at the plasma center calculated using an equilibrium reconstruction code EFIT was around 20 Pa. Therefore, it is suggested that fast electrons play an important role in the plasma equilibrium.

Original languageEnglish
Article number1202082
JournalPlasma and Fusion Research
Volume10
DOIs
Publication statusPublished - 2015

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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