Control of Horizontal Plasma Position by Feedforward-Feedback System with Digital Computer in the Jipp T-2 Tokamak

摘要

The confinement of high temperature, high density plasma and the control of the horizontal plasma position in a resistive shell tokamak, JIPP T-11, is reported by calculating the equilibrium equation of a large aspect ratio tokamak plasma, surrounded by a thin resistive shell of a skin time of 5.2 msec, every 1.39 msec with a digital computer. The required strength of the vertical field is determined by the control demand of two groups: a feedback term expressed by the deviation of plasma position from the desired one and proportion-integration-differentiation correction, and a feedforward term which is in proportion to the plasma current. The basic equations for the control of plasma position, derived from the tokamak equilibrium theory, are presented. The control system with the digital computer for tokamak equilibrium in JIPP T-11 is described along with the control system of horizontal plasma position.