Plasma Position Control
The accurate control of the plasma position is essential in a tokamak reactor, where a large plasma current has to be created and maintained for several minutes. In the INTOR study1 it has been shown that an elongated plasma cross-section is advantageous in many respects for a reactor. Plasma configurations under consideration now for NET (Next European Torus)2 have elongations in the range 1.6 ÷ 2.2. As a consequence, due to the curvature of the external field3,4, the plasma is positionally unstable against axisymmetric vertical displacements. Aim of the paper is to show how the position control impacts on the overall design of the reactor, where all aspects with their correlations and reciprocal constraints have to be consistently examined.
KeywordsVertical Displacement Radial Displacement Active Circuit Vacuum Vessel Plasma Equilibrium
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