Plasma and Fusion Research
Volume 13, 1402039 (2018)
Regular Articles
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Abstract
The electron temperature and density were measured with an electrostatic probe in a helical plasma in the TOKASTAR-2 device in order to determine the location and the shape of the last closed flux surface (LCFS). The electron density inside the calculated LCFS was found to be higher in a helical plasma than in a plasma without a helical field when the electron-cyclotron-resonance layer was located inside the LCFS. Although errors in the manufacturing and installation of coils have been a concern, this result indicates that the LCFS formed in this device does not differ greatly from the calculated LCFS.
Keywords
TOKASTAR, stellarator, flux surface, field-line tracing, electron orbit, triple-probe measurement
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References
- [1] K. Yamazaki, Y. Taira, T. Oishi et al., J. Plasma Fusion Res. SERIES 8, 1044 (2009).
- [2] H. Ikezi, K.F. Schwarzenegger and C. Ludescher, Phys. Fluids 22, 2009 (1979).
- [3] K. Sakurai and S. Tanahashi, J. Phys. Soc. Jpn. 49, 759 (1980).
- [4] W VII-A TEAM, Nucl. Fusion 20, 1093 (1980).
- [5] J. Fujita et al., Plasma Physics and Controlled Nuclear Fusion Research (Proc. 8th Int. Conf., Brussels, Belgium, 1980) Vol.1, p.209.
- [6] M. Hasegawa, K. Yamazaki, H. Arimoto et al., Plasma Fusion Res. 7, 2402116 (2012).
- [7] T. Ueda, H. Arimoto, T. Fujita et al., Plasma Fusion Res. 10, 3402065 (2015).
- [8] T. Sakito, H. Arimoto, T. Fujita et al., Plasma Fusion Res. 11, 2402074 (2016).
- [9] T. Sakito, H. Arimoto, T. Fujita et al., Plasma Fusion Res. 10, 3402033 (2015).
- [10] Y. Shimooka, H. Arimoto, T. Fujita et al., Plasma Fusion Res. 11, 2402110 (2016).
- [11] S.L. Chen and T. Sekiguchi, J. Appl. Phys. 36, 2363 (1965).
- [12] K. Yamazaki, O. Motojima and M. Asao, Fusion Technol. 21, 147 (1992).
- [13] T. Oishi, K. Yamazaki, K. Okano et al., J. Plasma Fusion Res. SERIES 9, 69 (2010).