High density experiments with strong gas-puffing under ECRH in T-10

High density experiments were carried out in T-10 with strong gas-puffing under ECRH (Pec 1.2MW) with both perpendicular and oblique HF power launch. Densities exceeding the Greenwald limit (nGw) 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 nlim=nGw 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, τE∼n, saturates at ne=0.6·nlim. Saturated τE values exceeded the scaling L89P predictions up to 1.5 times and was close to the value predicted by H-mode scaling (H98,y2). (author)