Nanoclusters and nanoscale voids as possible sources of increasing dark current in high-gradient vacuum breakdown

Introduction to the Topical Issue high field QED physics

“…This may provide a new way to generate electromagnetic wave sources with strong practical applications, e.g., terahertz waves, ultra-violet waves, and mid-infrared beams. The second paper was written by Musiienko, et al [ 2 ], who proposed a potential barrier model by considering an additional current that can lead to high-gradient breakdowns in accelerating structures. A double potential barrier was proposed and used for calculations of the value of the field emission current density.…”