Coilgun energized by commercial power supply

The coilgun accelerates a projectile by the magnetic force produced from the current-carrying coil. We have examined the fundamental characteristic of coilgun directly energized by commercial power supply. We have successfully launched the projectile from the coilgun, and have investigated the energy conversion efficiency estimated by the velocity of projectile when the projectile, coil design and the half-wave number of applied voltage are changed. And we have examined the behavior of a projectile using a photo diode and a laser. Some simple calculations are also performed.