Thermal and stress analysis of the Faraday shield for the ORNL/TFTR RF antenna

The analysis approach used focused on the primary design concerns and included (1) temperature response of the tubes, graphite, and Inconel; (2) temperature response of the graphite bumpers; (3) stresses in the graphite tiles; (4) stresses in the tubes and tube welds; (5) stresses in the box and manifold welds; and (6) stresses in the bumpers. The results are based on several computer models that reflected both the original and the modified designs. The primary modification is the reduction in cross section of the rear tubes. The models were loaded with the worst-case combination of all loads for both high-T _i and low-T_i heat fluxes. A two-dimensional (2-D) finite-element model was formulated for evaluating of the stresses in the graphite tiles bonded to the Inconel tubes. Results from the braze stress analysis and the low-T_i heating mode analysis of the tube are reported. Results of the 2-D analysis of graphite and TZM (tantalum-zirconium-molybdenum) corner bumper, the quarter-symmetry shield analysis and the full-shield analysis are also presented