摘要: Carbonization is here defined as the plasmachemical in situ deposition of homogeneous, thin, carbonaceous films on entire first wall a fusion device. It has led to significant improvement plasma performance TEXTOR: suppression metal impurities (nmene ⩽ 1 × 10−5), Zeff close 1, density limit ne(0) R/BT = 4.7 1019 m−2 T−1 for ohmic discharges, improved power coupling and low steady state impurity levels during ICR-heating megawatt range. The technique developed at TEXTOR uses radiofrequency assisted DC-glow (RG) discharges flow H2(D2)/CH4(CD4) gases; process monitored via residual gas analysis. carbon-films are amorphous, semi-trans-parent, homogeneous without macroporosity incorporate large fraction hydrogen (HC ∼ 0.4). When we use 300 monolayer thick coating, reappearance metals occurs after about 3 working days ( ∼100 s each) when varying conditions used. appear much later high densities (ne⩾3 1013 cm−3), where C redeposition limiters important. recycling properties tokamak discharge differ strongly from those an all-metal machine. Isotope change-over experiments which illustrate these presented discussed detail. paper reviews experience gained with carbonized walls limiters. also covers part, recent operation graphite carbonization. Results achieved JET, ASDEX JIPP T-IIU carbonization summarized. applicability future devices impact tritium related problems addressed.
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