Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
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Low Beta MHD Equilibrium Including a Static Magnetic Island for Reduced MHD Equations in a Straight Heliotron Configuration
Kinya SAITOKatsuji ICHIGUCHIRyuichi ISHIZAKI
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2012 Volume 7 Pages 1403070

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Abstract

Low beta MHD equilibria including static magnetic islands generated by an external field are studied by using a two-step approach. The equilibria correspond to the reduced MHD equations in a straight heliotron configuration. In the first step, a diffusion equation parallel to the field line is solved with the magnetic field fixed for a solution of the pressure constant along field lines. In the second step, the equilibrium equation corresponding to the vorticity equation is solved with the pressure fixed for a solution of the poloidal magnetic flux. The two steps are iterated until the width of the island is converged. The equilibrium pressure profile as a result of the method is locally flat at both the O-point and the X-point of the magnetic island. Effects of a pressure diffusion perpendicular to the field are also studied. In this case, an equilibrium pressure of which the profile is flat at the O-point and steep at the X-point is obtained.

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© 2012 by The Japan Society of Plasma Science and Nuclear Fusion Research
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