Regular Articles

Full Text / References

Measurement of Tokamak Plasma with the External Helical Field Using a High-Speed Camera in TOKASTAR-2

Tatsuya SAKITO, Hideki ARIMOTO, Takaaki FUJITA, Atsushi OKAMOTO, Yusuke SHIMOOKA, Hiromasa ITOU, Ryoichi SUGIOKA, Kenji MURAOKA, Kouhei YASUDA and Ryoma YOKOYAMA

Department of Energy Engineering and Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

(Received 30 November 2015 / Accepted 23 March 2016 / Published 17 May 2016)

Abstract

The high-speed camera was used to evaluate the position of the plasma in TOKASTAR-2. A plane mirror was installed in the vacuum vessel to expand the field of view and get the image in the whole region between inner and outer walls. The images were taken at 86400 FPS with 256 × 128 pixels (20 μm / pixel) per frame in the tokamak discharge with and without the external helical field. Under the condition of the weak vertical field, the plasma position control was improved by the external helical field. The outward plasma displacement was suppressed and the plasma was located stably in contact with the inner legs of the TF coils.

Copyright (c) 2016 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

high-speed camera, emission intensity, tokamak discharge, helical field application, TOKASTAR, tokamak-stellarator hybrid confinement

DOI: 10.1585/pfr.11.2402074

Full Text

PDF format (1.6Mbytes)

References

• [1] H. Ikezi, K.F. Schwarzenegger and C. Ludescher, Phys. Fluids 22, 2009 (1979).
• [2] K. Sakurai and S. Tanahashi, J. Phys. Soc. Jpn. 49, 759 (1980).
• [3] W VII-A TEAM, Nucl. Fusion 20, 1093 (1980).
• [4] J. Fujita et al., Plasma Physics and Controlled Nuclear Fusion Research (Proc. 8th Int. Conf., Brussels, Belgium, 1980) Vol.1, p.209.
• [5] K. Yamazaki et al., J. Plasma Fusion Res. SERIES 8, 1044 (2009).
• [6] R. Nishimura et al., J. Plasma Fusion Res. 9, 3402059 (2014).
• [7] T. Sakito et al., J. Plasma Fusion Res. 10, 3402033 (2015).
• [8] T. Oishi et al., J. Plasma Fusion Res. SERIES 9, 69 (2010).
• [9] K. Yamazaki et al., Fusion Technol. 21, 147 (1992).