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(EXP5/11) Turbulence and Transport Studies in the Edge Plasma of the HT-7 Tokamak

W. Baonian¹⁾, M. Song¹⁾, B. L. Ling¹⁾, G. S. Xu¹⁾, Y. Zhao¹⁾, J. R. Luo¹⁾, J. Li¹⁾, HT-7 Team^1)
 
1) Institute of Plasma Physics, Chinese Academy of Sciences, P.O.Box 1126, Hefei, China 230031

Abstract.  The edge fluctuations and transport in the HT-7 tokamak are investigated using a Langmuir probe in ohmic and IBW heating discharges. The normalized fluctuation levels are in the range of 35-50% and 10-25% for electron density and temperature respectively and have a non-Boltzmann relation in the SOL. In IBW heated plasma, the particle confinement is greatly improved, the poloidal velocity shear in the SOL is strongly modified, equivalent to an additional poloidal velocity in electron diamagnetic direction. A de-correlation in the fluctuations and suppression in turbulent transport by the effect of the poloidal shear are found to be a common mechanism. The electrostatic driven turbulent transport can account for a significant part of global particle loss in both ohmic and IBW heated plasmas.

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