[Table of Contents]

Plasma and Fusion Research

Volume 9, 1206058 (2014)

Rapid Communications

Broadband Continuously Frequency Tunable Gyrotron for 600 MHz DNP-NMR Spectroscopy
Ryosuke IKEDA, Yuusuke YAMAGUCHI1), Yoshinori TATEMATSU1), Toshitaka IDEHARA1), Isamu OGAWA1), Teruo SAITO1), Yoh MATSUKI2) and Toshimichi FUJIWARA2)
Japan Atomic Energy Agency (JAEA), Mukoyama, 801-1 Naka-shi, Ibaraki 311-0193, Japan
1)
Research Center for Development of Far-Infrared Region, University of Fukui (FIR FU), Bunkyo, 3-9-1 Fukui-shi, Fukui 910-8507, Japan
2)
Institute for Protein Research, Osaka University, Yamadaoka, 3-2 Suita-shi, Osaka 565-0871, Japan
(Received 17 February 2014 / Accepted 24 March 2014 / Published 7 May 2014)

Abstract

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 1 GHz as the anode-cathode voltage varied. Thus, the broadest tuning bandwidth in the 400 GHz band gyrotrons was achieved.

Keywords

gyrotron, Gyro-BWO, frequency tuning, sub-millimeter wave, dynamic nuclear polarization

DOI: 10.1585/pfr.9.1206058

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This paper may be cited as follows:

Ryosuke IKEDA, Yuusuke YAMAGUCHI, Yoshinori TATEMATSU, Toshitaka IDEHARA, Isamu OGAWA, Teruo SAITO, Yoh MATSUKI and Toshimichi FUJIWARA, Plasma Fusion Res. 9, 1206058 (2014).