Dual Plasma Bullets Colliding Inside a Hollow Electrode of a Multielectrode Helium Plasma Jet

The dual plasma bullets colliding inside a hollow electrode of a helium plasma jet are observed for the first time. The jet device has a multielectrode configuration, i.e., several active and grounded electrodes are wrapped one by one on a quartz glass tube. The dual bullets are generated on the both sides of negative electrode. They move toward the central region of the hollow electrode, and finally, collide to each other. Some observations are novel, and may be useful for the further unravel of the underlying mechanism of plasma bullet.