Abstract
In order to realize a new method of powder particle beam machining, a fundamental approach to obtain a dense beam of powder particles was made with an Einzel lens designed from electron optical theories. The mechanism of forming well-focused beam is theoretically analyzed by a graphical method based on the electron optics, so that each of the particle trajectory and density distribution is represented as a function of the optical values and dimension of the lens. The validity of the theoretical analysis was proved by comparing the calculated density distribution with the measured beam spot on target material. Furthermore it became clear that the off-axis trajectories affected by spherical aberration remarkably contribute to the beam-spot formation and that the average beam density in the focused spot can be increased by about thirty times that of non-focused beam.
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