Before or tin plating nickel plating of bad contacts between the cathode, discharge sparks will melt into hollow copper hole.
镀镍前或锡电镀间的阴极接触不良，放电火花将铜材熔成凹洞。
2
A discharge model on the sputtering hollow cathode discharge (SHCD) copper ion laser is established, its characteristics of discharge, sputtering and the particle interaction processes are analysed.
The emission spectra of he plasma were measured by using three types of experiment devices: dielectric barrier discharge device, hollow-cathode discharge device and Penning discharge device.