T0501-4-2 高エネルギー分子線源に用いる超小型衝撃波管の動作特性の解明(マイクロ・ナノスケールの熱流体現象(4))

概要

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The molecular beam technique is one of the powerful methods to investigate the gas-surface interactions in rarefied gas flows. In order to generate the high energy beam in a range of 1-5 eV without any undesirable impurities, we have been developing a molecular beam source with a non-diaphragm type shock tube which can operate at a repetition rate high enough for efficient data acquisition. The volume of our shock tube is much smaller than that of conventional ones so that the evacuation time between each shot can be made as short as possible. The small inner diameter of the shock tube leads to the strong effect of the boundary layer on the acceleration and attenuation processes of shock waves. Hence we measured the shock Mach number to optimize the tube length. The results demonstrate that the molecular beam source using the small shock tube is promising and that the optimization of the configuration will make the beam energy higher than 1 eV.
2009-09-12