Perspectives of the Lithium Capillary-Pore System Application in Fusion: Experiments with Lithium Limiter on T-11M Tokamak

The idea of use the Capillary‐Pore System (CPS) as material of tokamak limiter is discussed. The results of CPS Li limiter tests in T‐11M tokamak have shown that the Li erosion in temperature interval 200 –700°C can not be a serious obstacle for tokamak operations. The sorption of deuterium ions by Li wall can be excluded by its heating up to 400–500°C. The idea of combined lithium limiter with thin (1‐0,6mm) Li CPS coating as a solution of heat removal problem was realized. The quasi steady state tokamak regime with duration up to 0.2–0.3s and clean (Zeff≈1) deuterium plasma has been achieved. The measurements of plasma radiation showed up to 90 % of total non‐coronal radiation losses located in a relatively thin (5cm) boundary layer. A version of Li CPS limiter of DEMO reactor and Li CPS limiter experiment in ITER are suggested. The concept of “emitter‐collector” tokamak limiter is discussed.