Magnetic Configuration in the Helical Device and Formation of the X-point in Helical Plasmas upon Injection of High Energy Particles
M.YAKOVLEV, O.MOTOJIMA1), S.INAGAKI1), A.SHISHKIN2), A.Komori1)
Department of Fusion Science, The Graduate University for Advanced Studies, 322-6,Oroshi-cho, Toki-city, 509-5292 Japan
It is necessary to improve plasma confinement for fusion reactor. The radial electric field and its shear can suppress the plasma turbulence, and thus the control of electric field is now very important issue. One of the candidates to control the electric field in plasma is injection of the charged particles proposed in [1, 2]. In this paper, additional configuration effect of injection of high energy charged particles in plasma is presented. The injected high energy charged particles drive the localized currents in plasma, and thereby they can modify the magnetic field structure, particularly can form the X-point. The helical magnetic configurations with X-points, which can be realized on LHD are proposed.
References
[1] O.Motojima, A.A.Shishkin, S.Inagaki, K.Y.Watanabe, Nucl. Fusion 40 (2000) 833
[2] S.Inagaki, O.Motojima, A.Shishkin, J. Plasma Fusion Res. SERIES 3 (2000) 485 [3] K.Itoh and S.Itoh, Plasma Phys. Controlled Fusion 38 (1998) 1
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