Plasma flow injection for self-organization studies of steady statespherical tokamaks

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The purpose of this research toward realization of an economic fusion reactor is to verify usefulness of the multi-pulsing Coaxial Helicity Injection (CHI) method which could maintain high β spherical tokamaks in steady state. We have demonstrated current amplification, extension of the plasma life time and increase in the ion temperature by the double-pulsing CHI on HIST. Furthermore, we have investigated self-organization of the poloidal flow shear, generation of the negative radial electric field and dynamo current drive mechanism including two fluid effects. The results are confirmed with help of 3D-MHD computational simulation.