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Poloidal and radial distributions of the hydrogen flux, both atomic and ion, to the plasma facing materials (PFMs) are measured with four fixed and one movable PdCu membrane probes in the QUEST spherical tokamak. Direct information about hydrogen retention in the areas far from main plasma-wall interaction is essential because the significant part of the global retention is due to atomic hydrogen...
To clarify the effectiveness of a collimator in collimation sputtering, the film fabrication process is numerically examined by the test-particle Monte Carlo method. Distribution of film thickness and coverage of contact hole are analysed under various conditions of the following parameters, collimator thickness, deposition probability for collimator, collimator location, and background gas pressure...
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