Threshold Evaluation of Smooth Surface Dielectric Composite Large-area Explosive Emission Cathode

Dielectric modification is an important means to improve the performance of explosive electron emission cathodes. However, the influence of dielectric properties on the cathode threshold is not completely clear, especially the dielectric particle size and dielectric constant value. Therefore, based on the classical field emission theory and dielectric field enhancement theory, the effects of particle size and dielectric constant on the emission threshold of dielectric composite EEC are evaluated. The results show that a small medium size and a small dielectric constant value are beneficial for cathode priming.