Broadband Continuously Frequency Tunable Gyrotron for 600 MHz DNP-NMR Spectroscopy
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A broadband continuously frequency tunable gyrotron with a triode-type magnetron injection gun was developed as power source for analysis of protein structures. The TE<sub>7,3 </sub>oscillation mode was selected to avoid mode competitions in the high magnetic field side. Axial modes of the TE<sub>7,3,−10 </sub>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 1GHz as the anode-cathode voltage varied. Thus, the broadest tuning bandwidth in the 400 GHz band gyrotrons was achieved.
- Plasma and Fusion Research
Plasma and Fusion Research 9(0), 1206058-1206058, 2014
The Japan Society of Plasma Science and Nuclear Fusion Research