Preliminary Circuit Analysis of a [Formula Omitted]-Band High-Power Extended Interaction Oscillator With Distributed Hollow Electron Beam

In this paper, the circuit synthesis concept is applied to support a novel extended interaction RF circuit for generating a high-power millimeter-wave radiation. Its novel configuration is constructed by parallel connecting multiple sheet-beam-extended interaction cavities arranged along the angular direction to form a distributed hollow electron beam (HEB) as a whole. The specific concept endows the proposed circuit features such as: 1) making the diameter of HEB flexible and hence extending the space to set more single-sheet beam cavity in angular direction for increasing power capacity and 2) offering the opportunity to adopt a mutual magnetic focusing system for the distributed HEB, which is critical for the feasibility of the circuit synthesis. The circuit analysis is carried out, and a [Formula Omitted]-band extended interaction oscillator (EIO) based on this concept is proposed to preliminarily demonstrate the capability of circuit synthesis. The distributed HEB is produced with an immersed electron gun using a 0.8 T focusing magnetic field. Simulations using 3-D particle-in-cell (PIC) technology in Computer Simulation Technology (CST) predict a peak output power up to 10.0 kW around 103 GHz with the beam current of 4.2 A at 27 kV.