RELATIONSHIP BETWEEN MAGNETIC FIELD STRUCTURE AND PLASMA DENSITY PROFILE IN LHD EDGE REGION
H.Matsuura,S.Iguchi,T.Morisaki1),K.Tanaka1),A.Komori1),O.Motojima1),LHD Experimental Group1)
Osaka Prefecture University,Sakai,Osaka 599-8531,Japan
The last closed flux surface (LCFS), which define the boundary between nested magnetic surfaces and the so-called separatrix layer is one of the key parameters for the coil winding design of the helical experimental devices. Due to the complicated ergodic properties, however, its position is still unclear[1]. Moreover, this ergodicity is thought to change with the magnetic axis shift or the plasma beta effect.
References
[1]H.Akao,J.Phys.Soc.Jpn.,59(1990)1633
[2]T.Morisaki et al.,Proc. 30th EPS conf. on Cont. Fusion and Plasma Phys.,(2003,Saint Petersburg) [3]H.Matsuura et al.,J.Plasma Fusion Res. SERIES,1(1998)213
This work is performed with the support and under the auspices of the NIFS Collaborative Research Program.
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