Control of Toroidal Expansion of a High Beta Plasma Column in a Pinch Tokamak by Programmed Pulsed Vertical Field
- 1 January 1981
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 20 (1) , 151-156
- https://doi.org/10.1143/jjap.20.151
Abstract
Dynamics of high beta toroidal pinch plasmas in the major radius plane are calculated after a simple model and compared with experimental results of STP-2 screw pinch1) which is operated under the condition of T e≃20 eV and n e≃1.2×1015/cm3. It is demonstrated that the calculation agrees with the experimental results in the early phase of the discharge where the plasma keeps a high beta value (poloidal βp≃3) while the discrepancy between them begins to grow after 8 µs from the start of the main discharge because the βp value decreases considerably. In order not to deviate the plasma column from the center of the discharge tube a concept of the effective dissipative force generated by a 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 since unfavorable toroidal expansion disappears completely in a few microseconds by a proper programming of the pulsed vertical field.Keywords
This publication has 1 reference indexed in Scilit:
- Plasma equilibrium in a TokamakNuclear Fusion, 1971