Broadband Continuously Frequency Tunable Gyrotron for 600 MHz DNP-NMR Spectroscopy

A broadband continuously frequency tunable gyrotron with a triode-type magnetron injection gun was developed as power source for 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 seque...

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Bibliographic Details
Published inPlasma and Fusion Research Vol. 9; p. 1206058
Main Authors IKEDA, Ryosuke, YAMAGUCHI, Yuusuke, TATEMATSU, Yoshinori, IDEHARA, Toshitaka, OGAWA, Isamu, SAITO, Teruo, MATSUKI, Yoh, FUJIWARA, Toshimichi
Format Journal Article
LanguageEnglish
Published The Japan Society of Plasma Science and Nuclear Fusion Research 2014
Subjects
dynamic nuclear polarization
frequency tuning
Gyro-BWO
gyrotron
sub-millimeter wave
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Summary:A broadband continuously frequency tunable gyrotron with a triode-type magnetron injection gun was developed as power source for 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 1GHz as the anode-cathode voltage varied. Thus, the broadest tuning bandwidth in the 400 GHz band gyrotrons was achieved.
ISSN:1880-6821
1880-6821
DOI:10.1585/pfr.9.1206058