Development of a new TZM substrate flowing liquid lithium limiter for high performance plasma discharge in EAST

摘要

Liquid metal plasma-facing components (PFCs) provide certain promising advantages as compared with solid PFCs. A new flowing liquid lithium (FLiLi) limiter using a Titanium-Zirconium-Molybdenum Alloy (TZM) material substrate was developed and inserted into H-mode plasmas in EAST. As compared to the previous FLiLi limiters that used a copper heat sink covered with a stainless steel (SS) protective coating, the TZM limiter has better erosion resistance and wettability. Also, helium-cooling and water-cooling simulations show acceptable performance under continuous 2 MW/m(2) heat flux deposited on the plate for 10 s. Both simulations show a peak surface temperature located at the ends of the plate where the cooling tubes can't quite reach just below 650 degrees C while ignoring the influence of Li flowing, evaporation, and vapor shielding. Moreover, FLiLi is introduced to plasma lead to lower recycling and slight storage energy of plasma increase.