The Mechanical Analysis of ELM Joint under Coupling Field

Abstract

The Edge Localized Mode coil is the key component to prohibit the phenomena of disruptive instability occurring in the edge of Tokamak plasma. The coil is made of Stainless Steel Jacketed Mineral Insulated Conductors. And the different pieces of conductor are connected by joints. During the normal operation of Tokamak device, the joints will be shocked by the electromagnetic and thermal loads. Thus, it is necessary to perform the mechanical analysis to verify whether or not the ELM joint has sufficient safety margin to resist the impact of the coupling field. To get the load boundary conditions for the mechanical analysis, the electromagnetic and thermal analysis are launched first. Then the obtained temperature and electromagnetic force density are inserted into the mechanical analysis model. And the equivalent stress is calculated subsequently. The analysis results indicate there is stress intensity. To mitigate the stress intensity, the local structural optimization is employed. Finally, the stress evaluation is carried out based on analytical design. The assessment results demonstrate the optimized model has sufficient safety margin to withstand the shock of multiple loads.