ICCD Imaging of Coexisting Arc Roots and Arc Column in a Large-Area Dispersed Arc-Plasma Source

Arc attachments to cathode, as well as to anode, had been investigated with the bulk arc plasma between the coaxial electrodes with short-exposure-time ICCD imaging. The images captured suggests that multiple cathodic spots and diffuse attachment to the anode and cathode might contribute to the stability of rotating annular plasma dispersed by strong external coaxial magnetic field.