A 0.14 THz Angular Radial Extended Interaction Oscillator

Abstract

A 0.14 THz angular radial extended interaction oscillator (AREIO) is proposed in this article. The characteristic impedance (<inline-formula> <tex-math notation="LaTeX">${R}/{Q}$ </tex-math></inline-formula>), the normalized equivalent conductance (<inline-formula> <tex-math notation="LaTeX">${g}_{e}$ </tex-math></inline-formula>), and the starting condition of the cavity are calculated and analyzed. When the metal loss is considered, in order to achieve the starting condition, it is necessary to increase the period length (<inline-formula> <tex-math notation="LaTeX">${p}$ </tex-math></inline-formula>) to improve <inline-formula> <tex-math notation="LaTeX">$\vert {g}_{e}\vert $ </tex-math></inline-formula>. The performance of the AREIO is simulated by particle-in-cell (PIC). The voltage tuning range and the output performance under different angular angles of the cavity are investigated. Under the condition of lossless and the electron beam of 11.5 kV and 1.5 A, the peak output power and interaction efficiency of the AREIO (8&#x00B0;) are 5.46 kW and 31.7&#x0025;, which have increased by 24.1&#x0025; and 6.2&#x0025; in comparison with conventional sheet beam. When considering the metal loss, the optimal angular angle will decrease to 4&#x00B0;. In addition, the cavity is fabricated and tested, and the results of <inline-formula> <tex-math notation="LaTeX">${S}_{{11}}$ </tex-math></inline-formula> in operating mode are consistent with the simulation.