Abstract- Design and experiment of A 340 GHz traveling wave tube for terahertz cloud radars

Pan Pan,  Ye Tang,  Hanyan Li,  Tianyi Li,  Lin Zhang,  Dong Li,   Jinjun Feng,

https://ieeexplore.ieee.org/document/8289713/


The 340 GHz traveling wave tube is being developed for the terahertz cloud radar. The device is designed to produce 1 W output power. It uses a pencil electron beam focused by PPM and a microfabricated folded waveguide slow wave structure. The first prototype has achieved 50 mA of transmission current but there is no amplification due to the immense loss. After redesign and improvement of the slow wave structure, the loss of the latest prototype is much lower. The latest prototype will be tested soon.

Abstract-Backward wave oscillator for high power generation at THz frequencies

Diana Gamzina,  Xiang Li,  Christian Hurd,  Ye Tang,  Xuejiao Huang,  Yuan Zheng,  Logan Himes, Michelle Gonzalez,  Hanyan Li,  Pan Pan,  Rosa Letizia,  Jinjun Feng, Neville C. Luhmann, Claudio Paoloni,


https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10383/1038303/Backward-wave-oscillator-for-high-power-generation-at-THz-frequencies/10.1117/12.2273256.short



The progress in microfabrication techniques and three dimensional electromagnetic simulations have enabled the fabrication of vacuum electron devices up to 1 THz. In particular, the backward wave oscillator is a compact and powerful THz vacuum source, based on the transfer of energy from an electron beam to an electromagnetic (EM) wave propagating in a slow wave structure. The paper reports the design and fabrication challenges to realize a near-THz Backward Wave Oscillator for plasma diagnostics in nuclear fusion. In particular, the beam optics and confinement as well as the slow wave structure are described. Manufacturing as well as device implementation and demonstration considerations are discussed. The double corrugated waveguide is used with a cylindrical electron beam producing an output power on the order of 1 W.

© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.