Laboratory experiment on lithium chemistry and its application to effective wall conditioning
Abstract
Laboratory studies on the physical chemistry of lithium wall conditioning effects observed in fusion reactors are reported, focusing on a role of lithium in dramatic decrease in carbon impurities in TFTR. Auger depth analysis of lithium-deposited graphite shows deep intercalation of lithium into graphite at room temperature. Helium ion bombardment (150-200 eV) on the lithium-saturated graphite leads to preferential sputtering of lithium and reduction of the net sputtering yield of carbon by an order of magnitude. Finally, general precautions to achieve reproducible lithium effects in fusion machines are described.
- Publication:
-
Journal of Nuclear Materials
- Pub Date:
- 1999
- DOI:
- 10.1016/S0022-3115(98)00889-7
- Bibcode:
- 1999JNuM..266..406K