M. Roccella

Ignitor Plasma Chamber, First Wall and Remote Handling maintenance

The upgraded design of the plasma chamber (PC) and of the first wall (FW) system consider the updated scenarios for IGNITOR vertical plasma disruption (VDE). The electromagnetic (EM) loads are so large to require a dynamic elastic-plastic structural analysis of the PC. A 360deg PC torus has been modeled to take into account the toroidal asymmetry of the halo current as well as the lateral EM loads. The PC wall thickness reduces the displacements within the clearance with toroidal coil. The PC low-cycle fatigue analysis results in a lifetime longer than the number of disruption events at the maximum performance

The IGNITOR Load Assembly Structural Analysis and Toroidal Field Coil

The structural analysis of the IGNITOR machine load assembly has been performed taking into account the friction coefficients at the interfaces between the significant components. The finite element ANSYS model was used to analyze the nonlinear mechanical behavior of the structure. The calculation shows stresses within the allowable limits at the operating temperature. Interlaminar shear stresses values on TFC insulation have been validated by the results of test performed by Ansaldo. Two full size of Ignitor TFC turns have been manufactured by Kabel Metal to qualify the fabrication process and the hardening of the material OFHC. Several samples of the cooling channel were machined to validate the Electron Beam (EB) welding process