||Kirtland Air Force Base, NM 871175776
|Shiffler, Donald A.
Vacuum electronic sources over a wide range of wavelengths at high power density represent a current area of research interest for AFRL, particularly the applications of metmaterials to these sources. Current research spans the range from 1 GHz L-band sources at gigawatts of power, to 90 GHz W-band sources at megawatts of power, to THZ sources at hundreds of watts of power. Each of these technology areas shares the extreme difficulties of coping with large power densities that stress current materials technology as well as the physical understanding of basic physics phenomenology of the sources operation. Therefore, this research area requires a strong coupling between experimental work, theory, and modeling and simulation.
We are interested in the following: (1) applications of microwave metamaterials to high power microwave, millimeter wave, and THz source; (2) novel vacuum electronic sources with large bandwidth and frequency agility, operating in the range from 1 GHz to the THz regime; (3) new technologies, such as nonlinear transmission lines, which provide wide ranges of frequency tunability and agility; (4) supporting technologies to enable these devices, which comprises technologies such as new cold cathode materials, new electron collectors, new vacuum window technologies, new vacuum pumping technologies, and new pulsed power materials and topologies; and (5) adoption of advanced materials modeling to investigate new materials for all aspects of these sources. Efforts to improve each of these areas, with strong coupling between theory, experiment, and modeling comprise a vital aspect of these research goals.
Shiffler D, et al: IEEE Special Issue on High Power Microwaves: June 2010
Shiffler D, et al: Journal of Applied Physics 103: 013302, 2008
Vacuum electronic sources; Nonlinear transmission; Cathode materials; Electron collectors; Pulsed power; Metamaterials;