Experimental investigation of cathode current density distribution in vacuum arc based on ring-shaped electrodeL.J. Wang, L.H. Wang, S.L. Jia, X. Zhou, D. Yang and Z.Q. ShiEur. Phys. J. Appl. Phys., 58 1 (2012) 10801DOI: https://doi.org/10.1051/epjap/2012110411