Visual montioring of large plasma

A visual system for monitoring transient plasma is presented. Dark particle distributions caught by the system proved effective for monitoring a large plasma space. A distrribution of electron orbits revealed that dark and less dark partices match ions and electrons, respectively. Light radiation evolved spatially from the electrode in the upward direction. Axial distributions of particle counts separated an entire discharge space into a plasma body, presheath and sheath. The axial sheath structure showed a neagative layer on an electrode. The axial particle profile was close to the typical one of electron number density. Illustrated was a real-time transient behavior of axial particle profile.