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(EXP3/02) Improved Confinement Induced by Tangential CT Injection in STOR-M

C. Xiao, W. X. Ding¹, D. R. McColl, D. White, A. Hirose

Plasma Physics Laboratory, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
¹ Present address: Oak Ridge National Laboratory, Oak Ridge, Tennessee, U.S.A.

Abstract.  H-mode like discharges have been induced by tangential compact torus (CT) injection into the STOR-M tokamak. The improved confinement phase is characterized by an increase in the electron density, significant reduction in the H_$\alpha$ radiation level, steepening of the edge density profile, suppression of m = 2 Mirnov oscillations, and suppression of the floating potential fluctuations. These features are similar to those associated with the H-modes induced with edge turbulent heating or by electrode/limiter biasing in STOR-M. In contrast to the edge turbulent heating induced H-mode in STOR-M, the floating potential at the plasma edge and SOL increases during the CT injection induced improved confinement phase. Interaction between CT and edge tokamak plasma may be responsible for triggering the H-mode.

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