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Measurement of Ion Temperature and Flow in RF Start-Up Plasmas in TST-2 and LATE

Shintaro TSUDA, Akira EJIRI, Hitoshi TANAKA¹⁾, Yuichi TAKASE, Masaki UCHIDA¹⁾, Takashi MAEKAWA¹⁾, Naoto TSUJII and Toshihiro TAKEUCHI

Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan

1)

Graduate School of Energy Science, Kyoto University, Kyoto 606-8502, Japan

(Received 12 February 2015 / Accepted 6 April 2015 / Published 26 May 2015)

Abstract

The ion temperature and flow of RF start-up plasmas in TST-2 and LATE were measured using a visible spectrometer. The plasma currents were 9 kA and 8 kA, respectively. The typical ion temperatures T_i and toroidal flow V_φ were 4 eV and 1 km/s, respectively, in the TST-2 plasma sustained by the lower hybrid wave (20 kW) and T_i ∼10 eV and V_φ ∼5 km/s in the LATE plasma sustained by the electron cyclotron wave (50 kW). The poloidal flow velocities were comparable to the toroidal velocities. The ion temperatures were relatively high and the ion orbit loss can be significant.

Copyright (c) 2015 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

lower hybrid wave, electron cyclotron resonance wave, spectrometer, flow, rotation, ion temperature, spherical tokamak, TST-2, LATE

DOI: 10.1585/pfr.10.1202064

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References

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This paper may be cited as follows:

Shintaro TSUDA, Akira EJIRI, Hitoshi TANAKA, Yuichi TAKASE, Masaki UCHIDA, Takashi MAEKAWA, Naoto TSUJII and Toshihiro TAKEUCHI, Plasma Fusion Res. 10, 1202064 (2015).