Microwave and RF Vacuum Electronic Power Sources

Millimeter wave traveling wave tubes for the 21st Century

“…There exist a wide variety of microwave tubes including triodes, linear beam devices, crossed field devices, periodic beam devices, gyro devices, forward wave devices, and backward wave devices, as well as fast wave and slow wave devices. In the following, these terms will be briefly referred to the references for more details [1][2][3][4][5]. Most microwave vacuum tubes fit into more than one of these categories.…”

Recent discrete model for small-signal analysis of traveling-wave tubes

“…The interaction of electromagnetic waves and particle beams is an important physical issue in many respects. It relates with foundational aspects of electrodynamics [1,2], with basic processes in plasmas and accelerators [3][4][5][6][7], as well as with the development of instruments [8] and with industrial applications such as vacuum electronic devices [9][10][11]. A fully detailed description of this interaction is challenging, because the fields are by definition functions of both space and time, while the many particles require equally many position and velocity variables.…”

“…Solutions are purely real values. The forward circuit wave is simply the "cold" dispersion relation(10).…”

Effect of Beam tunnels on Resonant Frequency of Cylindrical Reentrant Cavity

“…INTRODUCTION Klystrons are high-power amplifiers and find wide applications in military radars as well as in communication systems. Conventional Single-beam Klystrons (SBKs) and Multiple-beam Klystrons (MBKs) employ cylindrical reentrant cavities or rectangular reentrant cavities in their interaction structure [1][2][3][4][5] . The cylindrical reentrant cavities are analytically treated using equivalent circuit analysis where reentrant cavity could be represented by lumped parallel resonant circuit 6,7 .…”

“…1(a) and with multiple beam-tunnels is shown in Fig. 1(b 3,6 and its equivalent lumped circuit 3,6 are shown in Figure 2(a). In the equivalent circuit analysis, magnetic field in drift-gap region is assumed to be negligible and ignored.…”