Abstract
Evidence is shown of the capability of non-axisymmetrical conducting structures in the Experimental Advanced Superconducting Tokamak (EAST) to guarantee the passive stabilization of the n = 0 MHD unstable mode. Suitable numerical modeling of the experiments allows a clear interpretation of the phenomenon. This demonstration and the availability of computational tools able to describe the effect of 3D conductors will have a huge impact on the design of future fusion devices, in which the conducting structures closest to plasma will be highly segmented.
Highlights
Advanced Superconducting Tokamak (EAST) to guarantee the passive stabilization of the n = 0 MHD unstable mode
This demonstration and the availability of computational tools able to describe the effect of 3D conductors will have a huge impact on the design of future fusion devices, in which the conducting structures closest to plasma will be highly segmented
Tokamaks are toroidal fusion devices in which the plasma evolution can be conveniently described, in many cases, by Magneto-Hydro-Dynamics (MHD) equations[1]. These predict the possible existence of unstable modes of evolution, which can be classified in terms of the toroidal mode number n, and are characterized by a growth rate
Summary
With reference to the old geometry of EAST (significantly upgraded in 2014) it has been demonstrated[5] that in this device the vessel is too far from the plasma to provide passive stabilization, which is guaranteed by plasma facing components These are intrinsically non-axisymmetric, being toroidally segmented and connected to the vessel through supports. The aim of this paper is to prove that this happens even with the new geometry of the conductors of EAST, providing a deep physical insight in the phenomenon to support this conclusion To this purpose, a suitable computational tool will be used, called CarMa06, which has the unique feature of including the effect of 3D conductors on the evolution of fusion plasmas. A careful analysis of the stabilizing current density patterns in the structures and the derivation of an equivalent axisymmetric model allows a clear interpretation and a precise quantification of this effect
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