Research in CPBG covers a wide spectrum of activities ranging from the physics and design of high brightness beams for advanced accelerator applications, research and development on high-power microwave sources for future linear colliders (gyroklystron), harmonic gyrotrons, radar/communication systems, beam transport experiments (especially the construction of a new facility, the University of Maryland Electron Ring (UMER)), construction of the Maryland Infrared FEL (MIRFEL), and other applications to plasma microwave electronics and microwave processing of materials. Most of the group's research is centered around experimental facilities, but there is also a strong theoretical effort involving both analytical theory and numerical simulation in support of the experiments in our laboratory and elsewhere.