Ryosuke IKEDA, Yuusuke YAMAGUCHI
A broadband continuously frequency tunable gyrotron with a triode-type magnetron injection gun was developed as a power source for the analysis of protein structures. The TE7,3 oscillation mode was selected to avoid mode competitions in the high magnetic field side. Axial modes of the TE7,3,−10 were sequentially excited by changing the cavity magnetic field, and frequency tuning of about 4 GHz around 395 GHz was observed with output power greater than 50 W. The frequency also varied about 1 GHz as the anode–cathode voltage varied. This research demonstrates that the broadest tuning bandwidth in the 400 GHz band gyrotrons can be achieved. Frequency lag in the order of 100 MHz due to fabrication errors necessitates fine continuously frequency tunability to optimize transmission frequencies for dynamic nuclear polarization (DNP) applications. Integrating both magnetic field sweep and axial mode excitation methods allows for faster and finer adjustments of oscillation frequencies, enhancing the sensitivity of solid-state nuclear magnetic resonance spectroscopy for the structural analysis of complex proteins.
@article{deb67b0a-9d65-4ab4-90ab-ab1166634ba6,
title={Broadband Continuously Frequency Tunable},
author={Ryosuke IKEDA and Yuusuke YAMAGUCHI},
year={2026},
language={en}
}TY - JOUR TI - Broadband Continuously Frequency Tunable AU - Ryosuke IKEDA AU - Yuusuke YAMAGUCHI PY - 2026 LA - en ER -
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