Abstract
Recently, large-scale, high-power railguns have been vigorously developed in order to investigate material behavior at high-pressures and to simulate meteorites impacts in space. On the other hand, when we intend to apply the railgun acceleration technique to more industrial fields (such as, for instance, new type of machining and impact testing of materials), miniaturization of the railgun system will be one of the courses to take. In this situation, high-power supply unit is not always required. Keeping these in mind, we consider a mini-railgun of 10cm length, which is driven by 2mF capacitor bank charged at 400V. In this note the influence of cross-sectional shape of the rail and initial position of the projectile (complete conductor) on the acceleration characteristics are examined theoretically. It is found that the cross-sectional shape of rail has appreciable influence on the acceleration and, for a given rail length, range of proper initial position of the projectile exists.
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