Multiple Beam Higher Order Mode W-Band Extended Interaction Oscillator With Improved Transmission Rate
- Resource Type
- Conference
- Authors
- Shahab Sarwar, Muhammad; Niu, Xinjian; Liu, Yinghui; Zhang, Tianzhong; Wang, Lina; Zeng, Rongxing
- Source
- 2023 24th International Vacuum Electronics Conference (IVEC) Vacuum Electronics Conference (IVEC), 2023 24th International. :1-3 Apr, 2023
- Subject
- Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Predictive models
Propagation losses
Surface roughness
Skin
Rough surfaces
Copper
Vacuum electronics
High Power
Higher-order-mode
low-voltage
improved transmission-rate
- Language
A Compact Multi-beam Extended interaction oscillator (MBEIO) has been designed with an attempt to address the power-limitation problem associated with the fundamental-mode EIO and to improve the beam-transmission rate by making the overall-length of the cavity shorter. The W-band MBEIO operates in the $TM_{31}-2\pi$ higher-order-mode (HOM) to increase the cavity size which in turn increases the power-handling capability and relaxes the high machining-precision requirement. The overall axial-length is made shorter by exploiting the synchronous-condition and by lowering the beam-voltage which may alleviate the problem of low beam-transmission in conventional EIOs with longer beam tunnels. Both the CST-PIC and MAGIC-3D simulations predict a stable device operation after 30ns with and an output power of 7.5kW and 7.38kW respectively. Furthermore, to account for the losses due to skin effects in the W-band and surface roughness the reduced conductivity of $4.12 \times 10^{7}(S/m)$ is used for background copper material.