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(EX/P5-12) Effect of Limiter Biasing on Plasma MHD-Stability in GDT Device

A.A. Ivanov1), P.A. Bagryansky1), A.A. Lizunov1), A.L. Solomachin2), A.A. Zuev1)
1) Budker Institute of Nuclear Physics, Novosibirsk, Russia
2) Novosibirsk State University, Novosibirsk, Russia

Abstract.  Radial electric field can essentially alter plasma MHD-stability in a long axisymmetric mirror traps stabilized by remote MHD-anchors. In particular, estimate show that for the Gas Dynamic Trap (GDT), the radial electric field is essential comparing with magnetic field curvature effects. Influence of the radial electric field on the MHD-stability was studied in the GDT using a set of electrically biased radial limiters and segmented end walls. That provides a control of the radial profile of ambipolar potential. It was shown that biasing the peripheral end wall section to a potential of $ \sim$150 V leads to considerable increase of the energy confinement time due to reduction of the electric field in the plasma volume. The MHD-stability boundary was significantly modified. Possible stabilization mechanism is considered in the paper.

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IAEA 2003