Development of advanced high-frequency gyrotrons with frequency tunability and Gaussian beam output

Authors

Masafumi Fukunari ⋅ JP Research Center for Development of Far-Infrared Region, University of Fukui

Abstract

Gyrotrons are high-power coherent radiation sources in the submillimeter to terahertz wavebands. High-frequency gyrotrons from 200 GHz to above 400 GHz are attractive radiation sources for spectroscopy applications, such as nuclear magnetic resonance with dynamic nuclear polarization (DNP-MNR). The oscillation frequency of the gyrotron is near the electron cyclotron frequency or its harmonics of the electron beam in the cavity. The oscillation at the 400 GHz bands can be obtained with an 8 T superconducting magnet using the second harmonic oscillations. Frequency tunability is necessary for these applications in spectroscopy to optimize the resonance condition. In this talk, advanced gyrotrons developed at the Research Center for Development of Far-Infrared Region, University of Fukui (FIR-UF), will be introduced. The advanced gyrotrons include second harmonic oscillation gyrotrons with an oscillation frequency above 400 GHz, continuously frequency tunable gyrotrons with a tuning frequency wider than 1GHz, multi-frequency oscillation gyrotrons, and multi-frequency Gaussian beam output gyrotrons.

About the Speaker

Masafumi Fukunari, Research Center for Development of Far-Infrared Region, University of Fukui

Masafumi Fukunari is an Assistant Professor at the Research Center for Development of Far-Infrared Region, University of Fukui. He received his Ph.D. degree from the University of Tokyo in 2015. He then joined the University of Tokyo as a project researcher to develop a gyrotron for beamed energy propulsion. He moved to the University of Fukui in 2016 and joined the gyrotron group in the center. His research interests include gyrotron, millimeter-wave discharge, beamed energy propulsion, and optical vortex beam generation.

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Issue

2023: Proceedings of the 41st Samahang Pisika ng Pilipinas Physics Conference

Article ID

SPP-2023-INV-3B-03

Section

Invited Presentations

Published

2023-07-01

How to Cite

[1]

M Fukunari, Development of advanced high-frequency gyrotrons with frequency tunability and Gaussian beam output, Proceedings of the Samahang Pisika ng Pilipinas 41, SPP-2023-INV-3B-03 (2023). URL: https://proceedings.spp-online.org/article/view/SPP-2023-INV-3B-03.