Restoration of the plasma stability during density limit disruption in T-10 tokamak using ecrh and ohmic power suply systemS

Abstract

Experiments in the T-10 tokamak have demonstrated possibility of control of the plasma current and prevention of formation of the non-thermal (E ~ 150 keV) electron beams after an energy quench at the density limit disruption using electron cyclotron heating and controlled operation of the Ohmic power supply system. Quasi-stable plasma operation can be restored after an energy quench using high auxiliary PEC/POH > 2—5 and high Ohmic power supply (Pps > 10—20 POH). Optimal conditions of the plasma discharge recovery after an energy quench using auxiliary heating are identified. Prevention of the non-thermal electron beams during density limit disruption is associated with stabilization of bursts of the magnetohydrodynamic (MHD) modes and heating of the background plasma. Numerical modeling has indicated that suppression of the non-thermal electrons can be connected with elimination of the bursting electric fields induced during periodic magnetic reconnections and reduction of the «equilibrium» electric field due to increase of the bulk plasma temperature. Plasma discharge recovery after an energy quench in tokamak reactor using auxiliary heating and controllable reduction of the plasma current is discussed.