Control of Toroidal Expansion of High beta Plasma Column in Pinch Tokamak by Programmed Pulsed Vertical Field.

摘要

Dynamics of high beta toroidal pinch plasms in major radius plane is calculated after simple model and compared with experiments using STP-2 screw pinch under the conditions of T sub(e) asymptotically equals 20 eV and n sub(e) asymptotically equals 1.2 x 10 exp 15 /cm exp 3 . It is demonstrated that the theory agrees with the experimental results during the early phase of the discharge where the plasma keeps high beta value (poloidal beta sub(p) asymptotically equals 3) while descrepancy between the experiment and calculation begins to grow after 8 mu sec from the start of the main discharge because the beta value decreases considerably. In order not to deviate the plasma column from the center of the discharge tube a concept of effective dissipative force generated by proper programming of the pulsed vertical field is introduced. It is demonstrated that this concept is useful to keep the shock heated high beta plasma in the center of the discharge tube through damping out of the unfavorable oscillation in a few. (Atomindex citation 12:628331)