The TFTR RF limiter upgrade design and installation

The RF limiters originally installed at Bays K-L and N-O were upgraded to a new configuration and six new limiters of similar design were added. The RF limiter upgrade protects the existing RF launchers and with a minor addition will protect the RF launchers to be installed in FY92, and will permit 50 MW of auxiliary input power for 2 s during plasma operation. Each of the new RF limiters is composed of 18 tiles for a total of 108. The design provides for revised and strengthened supporting mounts because of additional forces induced in the tiles. Tile material is a 2D carbon-carbon composite identical to the original tile material. The channel shaped tile is geometrically the same as the original design. Tooling was designed to replicate the vessel hardpoints and ease the subassembly tasks, installation of the entire system occurred during the FY91 opening. Integrated into the design are provisions to eliminate plasma damage to the insulators at the mounts