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Mechanically bolt-jointed plasma facing components (PFC) are developed and tested in order to use low cost and high performance divertor plates. Each PFC consists of a graphite tile, cooling pipe, and backing pipes. For the improvement of thermal properties of the PFC, a thin carbon sheet is used at the interface between the tile and backing plate. This PFC using a 100 μm carbon sheet and a copper...
Lanthanum hexaboride was coated on the wall surface of the vacuum vessel by magnetron sputtering, and the characteristics of pumping down of the coated vessel were investigated by comparing with those of the titanium nitride coated vacuum vessel. Right after the sputter deposition, both vacuum vessels were evacuated in the same way and the effective pumping speed of those surfaces was estimated to...
In order to investigate the effect of bakeout on the dependence of outgassing rate on pumping speed in a vacuum system, the outgassing rates of a test chamber at room temperature without baking and after bakeout at 100 and 250°C were measured as a function of pumping speed. The measured outgassing rate q(Torr l/s cm 2 ) obeys power law q = C(S/A) m where C and m (0 < m < 1)...
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