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摘要
In order to study the diffusion, surface recombination and trapping of hydrogen isotopes in tungsten, the processes are incorporated into a Monte Carlo code, EDDY. After estimating the relevant parameters by simulating an existing thermal desorption spectroscopy (TDS) experiment with the code, the deuterium retention characteristics of a tungsten divertor plate are investigated for an ITER plasma configuration. At the inner divertor plate and the early stage of discharge, the number of mobile D atoms reaches a steady-state value due to the balance between implanted and re-emitted atoms. During discharge, most of the implanted D atoms are retained in traps, and after saturating available traps, inward diffusion and subsequent trapping increase the inventory. The saturation distributes deeply into W at the strike point of the plate, where the surface temperature is higher than that at distance away from it. Most of the trapped atoms remain in the bulk even after discharge, whereas mobile atoms are strongly reduced.
- 出版日期2011-12
