Guest Editorial The Sixteenth Special Issue on High-Power Microwave Generation

The publication of this Sixteenth Special Issue on High-Power Microwave (HPM) Generation continues a series first published in December 1985. Since the first volume, the field has witnessed tremendous changes and advances, with research spanning the range of academic institutions, corporate research groups, government laboratories, from across the world. The subject areas addressed have evolved, as well. In 1985, the topics spanned five categories: 1) gyrotrons and cyclotron-resonance devices; 2) free-electron lasers; 3) virtual-cathode and reflex oscillators; 4) Cerenkov radiation generators; and 5) magnetrons, klystrons, and backward-wave oscillators. These areas still remain as active areas of research interest, now augmented by the rapid advance of particle-in-cell codes and electromagnetic solvers as tools to model and help understand HPM devices.