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(EX/P3-01) High Density Experiments with Strong Gas-puffing under ECRH in T-10

N.A. Kirneva¹⁾, Yu. Esipchuk¹⁾, A. Borschegovskij¹⁾, V. Chistyakov¹⁾, M. Dremin¹⁾, E. Gorbunov¹⁾, S. Grashin¹⁾, L. Khimchenko¹⁾, A. Khramenkov¹⁾, G. Kirnev¹⁾, S. Krilov¹⁾, V. Krupin¹⁾, T. Myalton¹⁾, Yu. Pavlov¹⁾, V. Poznyak¹⁾, I. Roy¹⁾, D. Shelukhin¹⁾, V. Trukhin¹⁾, E. Trukhina¹⁾, V. Vershkov¹⁾, E. Veschev¹⁾, V. Volkov¹⁾, V. Zhuravlev¹⁾, T-10 Team
 
¹⁾ RRC ``Kurchatov Institute'', Moscow, Russia

Abstract.  High density experiments were carried out in T-10 with strong gas-puffing under ECRH ( P_ec = 1.2 MW) with both perpendicular and oblique HF power launch. Densities exceeding the Greenwald limit ( n_Gw) up to 1.8 times were achieved in regime with high safety factor value, q(a) = 10. Decrease of q(a) to value of 3 led to the reduction of the ratio n_lim/n_Gw to 1. Confinement degradation with density growth was not essential up to the density limit. However, it was found that the typical for T-10 linear growth of the energy confinement time with density, $\tau_{E}$ $\sim$ n, saturates at n_e = 0.6 ^. n_lim. Saturated $\tau_{E}^{}$ values exceeded the scaling L89P predictions up to 1.5 times and was close to the value predicted by H-mode scaling (H98,y2).

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