抄録
In order to generate high-energy molecular beam in a range of 1 - 5 eV without any undesirable impurities, we have developed a 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. Our preliminary experiment showed that small inner diameter of the tube leads to the strong effect of boundary layer on the propagation of shock waves. In the present study, we measured shock Mach numbers in convergent tubes whose diameters linearly decrease from 4 mm to 2 mm and estimated the translational energy of shock-heated beam. The results suggested that a convergent shock tube with the optimized configuration could generate higher energy beam than straight one.
