Theoretical calculation and simulation studies for sideways force on vacuum vessel during VDEs in east

During the disruption scenario in plasma, eddy and halo currents are considered to be the most important sources that come out as a result of this phenomenon1. The components that affects primarily are diverter, First Wall (FW) and other main components because plasma is unstable in vertical displacement. In this scenario, plasma moves upward and downward resulting into plasma disruption and as a result, halo current is generated helically. This halo current produced in SOL component and flows into the vacuum vessel through in-vessel components that may give rise to large force acting on the vessel and in-vessel components. In EAST reactor, some sensors have been installed for calculating the halo currents at different locations. In these experiments, it has been shown that the halo current first spread out on outer baffle plate then moves to dome and finally return back to plasma. In this paper, theoretical model for calculating sideways force in vacuum vessel is developed and verified by experimental data from EAST Tokamak. The proposed innovative system allows an effective way to study the interaction forces with plasma under controlled conditions. We used magnetic field transformation method to calculate the plasma energy in different cross section in different degrees that shows plasma interacting forces including vertical and horizontal2. In this paper, we approached to observe the magnitude of the maximum observed sideways forces at EAST that causes asymmetric loads during VDEs. This work attains novelty as no theoretical calculations for plasma sideways force has been reported so far and this is the first time to used theoretical approach. A Matlab program was developed that has been verified by using experimental data from EAST. The main objective of the research is to established theoretical relation with experimental results so as to precautionary evaluate the plasma behavior in any Tokamak.