Characterization of gaseous carbon plasma in a low-temperature tokamak discharge

Abstract

A strongly ionized carbon plasma was generated in a tokamak discharge. The electron density of carbon plasma produced by a plasma-assisted arc was found to be about 10 19 m −3 . The carbon ion (C + ) density was estimated to be about 1.5 × 10 18 m −3 by use of the comparison spectroscopic method. Two-dimensional distributions of carbon ionization states were observed with an ICCD camera. The transport of carbon atoms is not influenced by the toroidal magnetic field, but carbon ions tend to move along the magnetic field.