MICROTURBULENCE IN HT-6M TOKAMAK

The small scale density fluctuations in the interior of HT-6M Ohmic pl asma have been studied by CO2 laser collective scattering system in de uterium discharges covering a range of n(e)q(a)BAR (chord-average dens ity times safety factor at the limiter) and energy confinement time. T he relative density fluctuation level in the interior is inversely pro portional to the toroidal magnetic field and average density, and the energy confinement time tau(E) decreases with the fluctuation level in creasing in the region where tau(E) linearly increases with n(e)q(a)BA R and satisfies the Goldston scaling law. It is suggested that the mic roturbulence in the interior sone is responsible for anomalous transpo rt in tokamaks.