Scattering of 300 K effusive D2 beams from the H/Si(1 0 0) surface

Dynamic fuel retention in tokamak wall materials: An in situ laboratory study of deuterium release from polycrystalline tungsten at room temperature

“…This hypothesis is based on the corrugated polycrystalline nature of the sample whose distributions of grain orientations (and cut misalignments with respect to crystalline planes) and azimuthal orientations should lead to a geometric smearing of the angular distribution of desorbing species. Such effects have been shown to significantly broaden angular distribution of scattered molecules [9][10][11] and molecules produced by recombination [12], especially when the surface contains defects and/or atomic steps [13]. The geometric acceptance of the differential pumping stage has been determined with Monte-Carlo particle trajectories simulation and depends on the ion beam footprint on the sample, the dimension of the aperture connecting the sample chamber and the QMS chamber, and the sample-aperture distance.…”