The Magnetic Energy Flow During Plasma Disruptions in J-TEXT

The magnitude of the damaging effects on the vacuum vessel (VV) components caused by the plasma disruptions increases with the quantity of the thermal energy and poloidal magnetic energy dissipated inside the VV. This paper focuses on the poloidal magnetic energy flow across the VV during the plasma disruptions in J-TEXT tokamak, which helps to calculate the quantity of the magnetic energy dissipated inside the VV (Wdis). The value of Wdis can be used to evaluate the relevant damage. Wdis equals the initial magnetic energy stored inside the VV before disruption (Wini) plus the magnetic energy flowing into the VV during disruption (ΔWflow). Wini is calculated by a Maxwell simulation model while ΔWflow is measured based on the Poynting theory. Wini takes 52 % of the total magnetic energy (Wtot) while ΔWflow takes 43.3 % according to the measurement results, leading to 95.3 % of the Wtot dissipating inside the VV during disruption. The characteristic of the magnetic energy flow and its analyzing method in J-TEXT provide reference for the other fusion devices.