Status of the NSTX-U Recovery Project Plasma Facing Components

Plasma-Facing Components play a critical role in the operation of magnetic fusion experiments. These components intercept plasma heat and particle flux preventing damaging fluxes from impinging vessel components and other structures. In addition, these components can present a uniform material composition that optimizes the experiment toward certain conditions. The NSTX-U Recovery Project is deploying upgrade plasma-facing components composed of isotropic graphites in order to minimize intrinsic impurity radiation and simultaneously present a surface that is immune to melting damage. Upgrades and redesign of the PFCs will maximize performance of these materials in order to enable the greatest possible flexibility in experimental operations. The impact of finite tolerances on component shaping designs, in particular, is considered and the resulting, subtle variations in design will be discussed.