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Surface Diversifying and Deuterium Retention Characteristics of Doped Graphite with SiC Coating Exposed to Plasma Discharges in EAST Tokamak

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Carbon-based material is widely used as plasma facing material (PFM) in fusion device, for its high thermal conductivity and good mechanical strength, such as the multi-element (B, Si, Ti) doped graphite with SiC coating in the divertor PFM in EAST tokamak. To study its service performance, surface diversifications were analyzed for the pristine sample and the samples after exposure to plasma discharges. The exposed samples have different structures in the SiC coating, depending on the different level of plasma heating loads. The nano-rods obtained from the higher heat loaded area are with diameters in the range of 200–500 nm and lengths in the range of 4–10 μm. While in the lower heat loaded area, the morphologies characterized by scanning election microscope show a transition stage between the pristine big crystals and the nano-rods. The SiC nanorods were further exposed to pure deuterium plasmas generated by linear plasma generator STEP and afterwards was analyzed by thermal desorption spectroscopy. The result indicates that the deuterium retention is increased remarkably.
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Keywords: DEUTERIUM RETENTION; DOPED GRAPHITE; HYDROGEN/DEUTERIUM PLASMA; MORPHOLOGY; NANO-RODS; SIC COATING

Document Type: Short Communication

Publication date: September 1, 2017

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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