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(EXP3/07) Control of a Pressure Driven m=1 Mode in a Low Shear LHCD Plasma by ECH in the WT-3 Tokamak

T. Maekawa¹⁾, Y. Terumichi²⁾, S. Yoshimura³⁾, M. Asakawa²⁾, H. Tanaka^1)
 
1) Graduate School of Energy Science, Kyoto University, Kyoto 606-8502, Japan
²⁾ Department of Physics, Kyoto University, Kyoto 606-8502, Japan
³⁾ Plasma Physics Laboratory, Osaka University, Osaka 565-0871, Japan

Abstract.  A large amplitude m=1 mode is excited by LHCD in the WT-3 tokamak ( a = 20cm, R = 65cm, Bt $\leq$ 1.75T). The mode excitation is accompanied with decrease of the magnetic shear near the q = 1 surface and peaking of the soft X-ray (SX) emissivity profile, suggesting that the mode is a pressure driven mode. The mode is suppressed by ECH near the q = 1 surface, while enhanced by ECH near the plasma center. The mode stabilization is accompanied with a local enhancement of the SX emissivity near the q=1 surface.

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