Development of a Compact sub-THz Gyrotron FU CW CI for Application to High Power THz Technologies
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Development of a Compact sub-THz Gyrotron FU CW CI for Application to High Power THz Technologies Toshitaka Idehara & Jagadish C. Mudiganti & La Agusu & Tomohiro Kanemaki & Isamu Ogawa & Toshimichi Fujiwara & Yoh Matsuki & Keisuke Ueda
Received: 27 February 2012 / Accepted: 6 May 2012 / Published online: 15 May 2012 # Springer Science+Business Media, LLC 2012
Abstract For application of high frequency gyrotron to high power THz technology, Gyrotron FU CW series is being developed in FIR FU. Gyrotron FU CW CI is developed as one of sub-THz gyrotrons included in the series. The advantage of the gyrotron is compactness using a compact superconducting magnet and compact power supply system, which makes the accesses of the gyrotron to applied large-scale devices easier and extends the applications of gyrotron to wider fields. The designed frequency and cavity mode are 394.5 GHz and TE26 mode for application to the 600 MHz DNP-NMR spectroscopy. As the operation results, the frequency and the output power were 394.03 GHz and around 30 W, respectively, which are available for the application to the 600 MHz DNP-NMR measurement. In addition, this gyrotron can operate at many other frequencies and cavity modes for application to high power THz technologies in wide fields. In this paper, the design and the operation results including long pulse or CW mode are presented. Keywords sub-THz . Gyrotron . Compact radiation source . High power . THz technology . DNP-NMR spectroscopy . Hybrid quantum beam technology
1 Introduction After the first gyrotron was developed in Institute of Applied Physics (IAP) of Soviet Union [1], high power millimeter wave gyrotrons were developed world-widely [2] as the major part of gyrotron development for application to the electron cyclotron heating (ECH) of fusion plasma and the electron cyclotron current drive of tokamak devices. Up to the present, the output power reaches higher than 1 MW in CW operation mode at the frequency of 140 GHz or 170 GHz. T. Idehara (*) : J. C. Mudiganti : L. Agusu : T. Kanemaki : I. Ogawa Research Center for Development of Far-Infrared Region, University of Fukui (FIR FU), 3-9-1 Bunkyo, Fukui-shi 910-8507, Japan e-mail: [email protected] T. Fujiwara : Y. Matsuki : K. Ueda Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita-shi, Osaka 565-0871, Japan
J Infrared Milli Terahz Waves (2012) 33:724–744
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On the other hand, high frequency, medium power gyrotrons with high field magnets were developed as the minor part of gyrotron development [3–8] for application to many high power THz technologies in wider research fields. The frequency ranges of such gyrotrons are extended to the whole sub-THz region. The output power is ranged from several tens watts to several kilowatts under stable operation of both pulse and CW modes. Recently, the highest frequency of gyrotrons exceeded even 1 THz, which was realized by the second harmonic operation and the fundamental operation. [8, 9] In our research center FIR FU, we have developed the latter high f
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