The lithium deposition on NSTX plasma facing components by LITER-1 evaporator in 2006

ORAL

Abstract

The deposition of lithium from the LITER-1 lithium evaporator to the in-vessel components of NSTX during the 2006 experimental campaign has been calculated using the recently written Cbebm code. Its numerical model represents a collisionless gas model which assumes re-evaporation of the Li molecules after their collision with the hot walls of evaporator. Theoretically, the model is valid up to lithium temperatures of 650 $^{\circ}$C. The code reproduces the real 3-D geometry of the evaporator canister and snout as well as the plasma facing components of NSTX, including the details of its carbon tiles. The simulation data can serve as a reference Li deposition distribution, which would be established in a perfectly clean vacuum vessel, and are compared with the lithium content in the surface layer of the sample tiles, obtained by Bill Wampler (SNL) using nuclear analysis.

*Supported by US DoE contract No.DE--AC020--76--CHO--3073.

Authors

  • Leonid E. Zakharov

    • Princeton University, PPPL
    • Princeton Plasma Physics Laboratory
    • PPPL
  • Henry Kugel

    • Princeton University, PPPL
  • Lane Roquemore

    • Princeton University, PPPL
  • Charles Skinner

    • Princeton University, PPPL