Abstract
To investigate the deuterium (D) retention behavior of plasma-facing materials (PFMs) in the Experimental Advanced Superconducting Tokamak (EAST), SiC-coated graphite, bulk W, and W coating were exposed to D plasmas employing the material and plasma evaluation system in EAST. A comparative study was performed in an electron cyclotron resonance (ECR) linear plasma facility as well. For the EAST experiments, the local electron temperature and density were $T_{e}\approx$ 10–15 eV and $n_{e}\approx$ (1–3) $\times$ 1018 m−3, respectively. In the ECR facility, the plasma parameters were measured to be $T_{e} \approx 2.4$ eV and $n_{e} \approx 1.5 \times 10^{17}$ m−3. The surface morphology was examined by scanning electron microscopy, and D retention properties of various PFMs were examined by thermal desorption spectroscopy. No significant modification of the surface morphology was observed after tokamak exposure experiments. Bulk W and W coating exhibit similar D retention behavior, while D inventory in SiC-coated graphite has been found to be much larger than that in W materials.
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