Pan, Pan, Yuan Zheng, Ying Li, Xubo Song, Zhihong Feng, Jinjun Feng, R. David Britt, and N. C. Luhmann. “Demonstration of a 263-GHz Traveling Wave Tube for Electron Paramagnetic Resonance Spectroscopy.” IEEE Transactions on Electron Devices 70, no. 11 (November 2023): 5897–5902.
https://doi.org/10.1109/TED.2023.3312230.
In this article, a 263-GHz traveling wave tube (TWT) for electron paramagnetic resonance (EPR) spectroscopy is designed, fabricated, and tested. A periodic permanent magnet (PPM) focused pencil beam electron optical system is adopted. A folded waveguide (FWG) slow wave structure (SWS) with modified serpentine bends is optimized to provide high-power wideband performance and stable operation. An experiment has been performed to verify the analysis results and confirm the amplifier stability. The device provides a maximum 11.9-W saturation output power and 25.5-dB saturation gain. Although the available solid-state signal source is unable to drive the amplifier to saturation beyond 260–264 GHz, 10-W output power over 5.6-GHz bandwidth has been measured.