Compact, High-Power Electron Beam Based Terahertz Sources. - Sandra G. Biedron; John W. Lewellen; Stephen Val Milton; Nachappa Gopalsami; John F. Schneider; Laura Skubal; Yuelin Li; Mathew Virgo; Gian Piero Gallerano; Andrea Doria; Emilio Giovenale; Giovanni Messina; et al. (Proc. IEEE, 2007)