Liu, Diwei, Wei Wang, and Tao Song. “High-Power Terahertz Source and Transmission Line for 400MHz DNP NMR System.” 2023 24th International Vacuum Electronics Conference (IVEC), April 2023, 1–2.
https://doi.org/10.1109/IVEC56627.2023.10157456.
A 263GHz frequency-tunable gyrotron is investigated experimentally, its frequency-tuning range is about 1.45GHz and the output power is from 26 W to 463 W when the operating magnetic field changes at a fixed operating voltage of 20 kV and a beam current of 0.8 A. The operating mode TE72mode is converted into a linearly gaussian beam efficiently with a Valsov-type quasi-optical mode converter. At the same time, the Gaussian beam is transmitted and focused with a low loss overmoded corrugated waveguides and quasi-optical units. The preliminary experiment on enhanced DNP-NMR system is carried out with the gyrotron and the transmission line.