Parametric dependencies of anomalous ion heat conductivity in T-10 plasma with Ohmic heating

Ion heat conductivity in deuterium plasma of the circular limiter tokamak T-10 is analyzed in more than 100 Ohmic shots. Four data scans: plasma density, effective charge, plasma current, and toroidal magnetic field are presented. Each scan is formed with the preservation of other parameters. It is shown that at the plasma periphery, r/a=0.6-0.8, the ion heat conductivity exceeds neoclassical values up to three to eight times. The anomalous part chi(an)(i) increases with plasma density and effective charge, while it decreases with plasma current and does not depend on the toroidal magnetic field. The highest value of chi(an)(i) is observed in high-density low-current regimes. More negative values of plasma electric potential correlate with higher values of chi(an)(i). The empirical scaling of chi(an )(i)is derived. The transport model based on this scaling allows us to describe experimental profiles of ion temperature Ti(r) within experimental error +/- 15%. Published under an exclusive license by AIP Publishing.