PPPS 2019

2P18 - E-band Overmoded Relativistic Backward Wave Oscillator

25 Jun 2019, 13:00

1h 30m

Universal Center

Poster 2.3 Slow-Wave Devices Poster - Microwave Generation and Plasma Interactions and Pulsed Power Switches and Components

Speakers

Liangjie Bi (University of New Mexico,University of Electronic Science and Technology of China) Ahmed Elfrgani (University of New Mexico)

Description

An E-band relativistic backward wave oscillator (RBWO) is proposed to generate megawatts of power. An overmoded rectangular slow wave structure (SWS) is chosen and combined with a relativistic hollow electron beam to increase the interaction impedance and avoid RF breakdown. To overcome the frequency limits of conventional fundamental mode version, a higher order mode is selected as the operating mode by using a mode selection technique. To demonstrate its capability, the RBWO based on the axisymmetric SWS has been designed and simulated using the particle-in-cell codes CST and MAGIC. The Gaussian output mode is obtained from the operating TM03 mode through a corrugated waveguide mode converter.
* Work at the University of New Mexico is supported through DARPA Grant #N66001-16-1-4042.