Post-mortem analyses of gap facing surfaces of tungsten tiles of T-10 ring limiter

Surfaces facing the gap between W tiles of ring limiter tokamak T-10 were analyzed after decommissioning using LIBS, SEM/EDA, XRD, TDS, and NRA techniques. Gaps with width 5 mm 0.1 nearly completely covered to their full depths 22 15 mm, respectively, by a deposited film. The film was formed mainly deposition lithium that came from Li transformed in air Li2CO3 Li2O. Carbon volatile hydrocarbons sputtered walls. Besides, carbon appeared due chemical reaction air. Chemical interactions C, O, led formation W2C, WC, WO2, Li2WO4. Carbides over entire surface depth gaps. Trapping deuterium helium demonstrated. Possible influence auto-oscillating discharges on ionization ion trapping C,D, He gaps is discussed.