Magnetohydrodynamic Equilibrium and Stability of Spheromak by Boundary-Fitted Curvilinear Coordinate System--Improvement of Plasma Confinement by External Coil

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  • Kamitani Atsushi
    Department of Applied Physics, Faculty of Engineering, The University of Tokyo
  • Kaneko Shobu
    Department of Applied Physics, Faculty of Engineering, The University of Tokyo
  • Uyama Tadao
    Department of Electrical Engineering, Faculty of Engineering, Himeji Institute of Technology
  • Watanabe Kenji
    Course of Electomagnetic Energy Engineering, Faculty of Engineering, Osaka University

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タイトル別名
  • Magnetohydrodynamic Equilibrium and Stability of Spheromak by Boundary-Fitted Curvilinear Coordinate System —Improvement of Plasma Confinement by External Coil—
  • Magnetohydrodynamic Equilibrium and Sta

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The flux conserver actually used in spheromak experiments has an entrance hole and a duct to introduce a plasma into it. The effect of the hole keeps some magnetic surfaces from closing in the flux conserver. A method of closing all surfaces is to place an external coil near the entrance hole and apply an electric current Ic whose direction is opposite to the plasma current Ip. Equilibrium configurations of the spheromak plasma in the flux conserver with the external coil are determined by using the boundary-fitted curvilinear coordinate system. The stability of these configurations are investigated by using the Mercier criterion. The results of computations show the plasma confinement is poor if Ic⁄Ip≈0, but it is considerably improved if Ic⁄Ip\gtrsim1⁄2 is satisfied.

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