“…3 This work is very briefly reviewed in the Appendix. The purposes of this report are (1) to review the small-signal theory of the velocity modulation of ideal Brillouin beams, (2) to modify this theory for application to actual beams and compare its predictions with the small-signaal r-f current contours found in the velocity-modulated beam described, and (3) to describe ,,ialitatively the large-signal data obtained for fundamental and harmonic currents using the equipment described in the Appendix. Figure 1 is a sketch of the system to be analyzed.…”