Abstract
Tritium codeposition in sputtered and redeposited surface layers may be a critical issue for next generation tokamak fusion reactors. We review recent codeposition/erosion code/model improvements, and calculations. Updated models for carbon include chemical sputtering yields, sputtered hydrocarbon species, and atomic and molecular processes. Calculations show that a carbon coated divertor with a semi or fullydetached plasma may behave poorly, with predicted codeposition rates of order 10 gT/1000s pulse, and peak net erosion rates of order 10 nm/s. Other materials such as beryllium, tungsten, lithium, or carbon with a non-detached plasma regime, look better. Outstanding research issues include reflection/sticking properties of redeposited carbon/hydrocarbon particles, possible flux dependence of chemical sputtering, and dopant effects.KeywordsTrapping RateDissociative RecombinationBeryllium OxidePlasma SolutionHydrogen TrappingThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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