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International Conference on infrared and Millimeter Waves

作者： M. Teranaka A. Doi T. Tatsukawa S. Watanabe F. Goda T. Idehara T. Kanemaki School of Medicine Kagawa University Mikicho Kagawa Japan Research Center for Development of for Infrared Region Fukui University of Technology Fukui Japan

The microwave invasion to living bodies at a millimeter wave catheter irradiation is described. The power sources of millimeter wave are an Impatt oscillator (94 GHz, 0.3 W) for the irradiation tests and a Gunn oscillator (90 GHz, 13 mW) for the reflection study. Irradiated samples are cow livers and living rats. The irradiation antenna used is a waveguide vent antenna with anti-reflecting multi layers.

关键词： Vents Petroleum Reflector antennas Catheters Gunn devices Reflection Oscillators Antenna measurements Millimeter wave measurements Reflectivity

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Influence of beam current and cooling water temperature on the frequency characteristics of sub-millimeter wave gyrotron FU-IV

Influence of beam current and cooling water temperature on t...

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International Conference on infrared and Millimeter Waves

作者： T. Hori T. Idehara H. Sasagawa A. Kimura I. Ogawa S. Mitsudo National Institute of Information and Communications Technology Koganei Tokyo Japan Research Center for Development of Far-Infrared Region University of Fukui Bunkyo Fukui Japan

The characteristics of the frequency drift are examined precisely for the SMMW gyrotron FU-IV. The drift of center frequency is reduced to be less than a few MHz during 20 minutes. Then, the frequency, the cooling-water temperature, the beam current and the output power are monitored simultaneously to examine the relationship among these parameters. The results indicate that the frequency drift is caused by thermal expansion and contact-ion of the cavity in a few /spl sim/10 MHz range and is also affected by non thermal frequency pulling effect of beam current when the behaviors within a few MHz range are considered.

关键词： Cooling Water Gyrotrons Temperature measurement Frequency measurement Bandwidth Magnetic field measurement Power generation Condition monitoring Thermal expansion

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High-power, short-pulse, large orbit gyrotron using a pulsed power generator "ETIGO-IV"

High-power, short-pulse, large orbit gyrotron using a pulsed...

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30th International Conference on infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics, 2005. IRMMW-THz 2005

作者： Kamada, M. Hayashi, T. Agusu, La Ogawa, I. Idehara, T. Manuilov, V.N. Naito, K. Yuyama, T. Jiang, W. Yatsui, K. Research Center for Development of Far-Infrared Region University of Fukui Bunkyo 3-9-1 Fukui 910-8507 Japan Radiophysical Department Nizhny Novgorod Stale University Gagarin av. 23 Nizhny Novgorod 690005 Russia Extreme Energy-Density Research Institute Nagaoka University of Technology Kamitomioka 1603-1 Nagaoka Niigata 940-2188 Japan

ISBN: (纸本)0780393481

A ultra high power gyrotron is being developed in millimeter and submillimeter wave region. The gyrotron is large orbit gyrotron (LOG) using an intense relativistic electron beam (IREB). A pulsed power generator "ETlGO-IV" is applied for IREB generation. A first prototype LOG was constructed for fundamental operation. The output characteristic of the LOG will achieve 143.6 GHz and 9 MW at the fundamental. Corresponding cavity mode is TE14. Cavities for 2nd and 4th harmonic operations were designed by numerical simulation. The progress of development for prototype LOGs is presented. © 2005 IEEE.

关键词： Gyrotrons

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High-power, short-pulse, large orbit gyrotron using a pulsed power generator "ETIGO-IV"

High-power, short-pulse, large orbit gyrotron using a pulsed...

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International Conference on infrared and Millimeter Waves

作者： M. Kamada T. Hayashi L. Agusu I. Ogawa T. Idehara V.N. Manuilov K. Naito T. Yuyama W. Jiang K. Yatsui Research Center for Development of Far-Infrared Region University of Fukui Fukui Japan Radiophysical Department Nizhny Novgorod State University Nizhny Novgorod Russia Extreme Energy-Density Research Institute Nagaoka University of Technology Nagaoka Niigata Japan

A ultra high power gyrotron is being developed in millimeter and submillimeter wave region. The gyrotron is large orbit gyrotron (LOG) using an intense relativistic electron beam (IREB). A pulsed power generator "ETIGO-IV" is applied for IREB generation. A first prototype LOG was constructed for fundamental operation. The output characteristic of the LOG achieves 143.6 GHz and 9 MW at the fundamental. Corresponding cavity mode is TE/sub 14/. Cavities for 2nd and 4th harmonic operations were designed by numerical simulation. The progress of development for prototype LOGs is presented.

关键词： Gyrotrons Power generation Pulse generation Electron beams Frequency High power microwave generation Submillimeter wave technology Prototypes Magnetic fields Coils

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development of a large orbit gyrotron (LOG) operating at higher harmonics

Development of a large orbit gyrotron (LOG) operating at hig...

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International Conference on infrared and Millimeter Waves

作者： T. Idehara I. Ogawa S. Mitsudo Y. Iwata S. Watanabe Y. Itakura L. Agusu K. Ohashi H. Kobayashi T. Yokoyama V. Zapevalov M. Glyavin A. Kuftin O. Malygin S. Sabchevski Research Center for Development of Far-Infrared Region Fukui University of Technology Bunkyo Fukui Japan Research Center for Development of Far-Infrared Region Fukui University Bunkyo Fukui Japan Cryogenic Laboratory Faculty of Engineering Fukui University of Technology Bunkyo Fukui Japan Cryogenic Laboratory Fukui University Bunkyo Fukui Japan Shin-Etsu Chemical Co. Ltd. Fukui Japan Russian Academy of Science Institute of Applied Physics N. Novgorod Russia Bulgarian Academy of Science Institute of Electronics Sofia Bulgaria

Large orbit gyrotrons (LOGs) are being developed by use of a permanent magnet system. The operation test shows that the LOG radiates at high harmonic frequency up to fifth. Computer simulation results are compared wit... 详细信息

关键词： Gyrotrons Permanent magnets Frequency Testing Electrons Power generation Voltage Power system harmonics Fabry-Perot interferometers Laboratories

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High frequency ESR measurements of thiospinel CuCrZrS/sub 4/

High frequency ESR measurements of thiospinel CuCrZrS/sub 4/

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International Conference on infrared and Millimeter Waves

作者： S. Mitsudo Y. Fujimoto T. Fujita M. Toda T. Idehara Y. Kawashima S. Nagata Cryogenic Laboratory Faculty of Engineering University of Fukui Bunkyo Fukui Japan Research Center for Development of Far-Infrared Region University of Fukui Bunkyo Fukui Japan Department of Materials Science and Engineering Muroran Institute of Technology Muroran Hokkaido Japan

Thiospinel CuCrZrS/sub 4/ has been studied by high frequency ESR using millimeter wave vector network analyzer (MVNA, ABmm). A Lorentzian absorption line in ESR spectrum is observed at high temperatures. The estimated g-value is 1.98 at 198 K. This value well agrees with the g value Cr/sup 3+/ free ion. With decreasing the temperature, the absorption at high temperatures splits into two absorptions below 100 K. While an absorption shifts to higher field, another absorption slightly shifts to lower field with decreasing the temperature. Resonance fields of both absorptions increase with increasing frequency at 4 K linearly. A possible model is discussed on the basis of the coexistent state of ferromagnetism and paramagnetism.

关键词： Paramagnetic resonance Frequency measurement Absorption Temperature Colossal magnetoresistance Chromium Zirconium Powders Millimeter wave technology Manganese

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Non-thermal effects on B/sub 4/C ceramics sintering

Non-thermal effects on B/sub 4/C ceramics sintering

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International Conference on infrared and Millimeter Waves

作者： S. Mitsudo H. Hoshizuki K. Matsuura T. Saji T. Idehara A. Kitano H. Nishi J. Ishibashi S. Sano Cryogenic Laboratory Faculty of Engineering University of Fukui Bunkyo Fukui Japan Research Center for Development of Far-Infrared Region University of Fukui Bunkyo Fukui Japan Tsuruga Head Office Japan Nuclear Cycle Development Institute Turuga Fukui Japan National Institute for Advanced Industrial Science and Technology Nagoya Japan

Boron carbide (B/sub 4/C) is one of advanced materials and is being used in a wide rage of applications. The unique feature of this material is its large neutron-absorbing cross-section. Some of its most prominent applications are controlling rods in nuclear reactors and radiation protection. 24 GHz microwave processing for B/sub 4/C ceramics were performed under flowing argon gas using the sintering system. Enhanced sintering was observed in B/sub 4/C ceramics for sintering with the microwave power of 2.5 kW as compare to 1.5 kW one, even at the same sintering temperature and holding time. The experiment results in different sintering conditions are presented.

关键词： Ceramics Boron Gyrotrons Laboratories Temperature Conducting materials Powders Frequency Thermal conductivity Thermal resistance

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development of a functional quasi-optical system for gyrotron application as a radiation source

Development of a functional quasi-optical system for gyrotro...

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International Conference on infrared and Millimeter Waves

作者： I. Ogawa T. Idehara K. Nagao H. Ando D. Wagner M. Thumm Research Center for Development of Far-Infrared Region Fukui University of Technology Bunkyo Fukui Japan Max-Planck Institut für Plasmaphysik Garching Germany Institut für Hochleistungsimpuls-und Mikrowellentechnik Forschungszentrum Karlsruhe GmbH (FZK) Karlsruhe Germany

Functional quasi-optical systems to treat a Gaussian beam converted from gyrotron output are necessary to the application of gyrotron as a radiation source. The necessary characteristics are compatibility with tunabil... 详细信息

关键词： Gyrotrons Electromagnetic waveguides Magnetic field measurement Optical coupling Plasma diagnostics Frequency Mirrors Microwave technology Superconducting magnets Plasma applications

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Experimental Observation of the 1/3 Magnetization Plateau in the Diamond-Chain Compound Cu3(CO3)2(OH)2

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Physical Review Letters 2005年第22期94卷 227201-227201页

作者： H. Kikuchi Y. Fujii M. Chiba S. Mitsudo T. Idehara T. Tonegawa K. Okamoto T. Sakai T. Kuwai H. Ohta Department of Applied Physics University of Fukui Fukui 910-8507 Japan Research Center for Development of Far-Infrared Region University of Fukui Fukui 910-8507 Japan Department of Mechanical Engineering Fukui University of Technology Fukui 910-8505 Japan Department of Physics Tokyo Institute of Technology Tokyo 152-8551 Japan Department of Physics Tohoku University Sendai 980-8578 Japan Faculty of Science Toyama University Toyama 930-8555 Japan Molecular Photoscience Research Center Kobe University Kobe 657-8501 Japan

The magnetic susceptibility, high field magnetization, and specific heat measurements of Cu3(CO3)2(OH)2, which is a model substance for the frustrating diamond spin chain model, have been performed using single crystals. Two broad peaks are observed at around 20 and 5 K in both magnetic susceptibility and specific heat results. The magnetization curve has a clear plateau at one third of the saturation magnetization. The experimental results are examined in terms of theoretical expectations based on exact diagonalization and density matrix renormalization group methods. An origin of magnetic anisotropy is also discussed.

关键词： Magnetization

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development of the material processing system by using a 300 GHz gyrotron

Development of the material processing system by using a 300...

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International Conference on infrared and Millimeter Waves

作者： H. Hoshizuki K. Matsuura S. Mitsudo T. Idehara O.V. Malygin V.I. Khizhnjak V.E. Zapevalov T. Ueda M. Furuiti A. Kitano H. Nishi J. Ishibashi Research Center for Development of Far-Infrared Region Fukui University of Technology Fukui Japan Institute of Applied Physics Russian Academy of Science Nizhny Novgorod Russia Fukushin Kougyou Company Limited Awara Fukui Japan Kiyokawa Plating Industry Company Limited Fukui Japan Tsuruga Head Office Japan Nuclear Cycle Development Institute Turuga Fukui Japan

An increase in the frequency of microwave used for the processing of materials has a great potential for the applications. We developed the material heating system by using a 300GHz gyrotron. This system are consisted of a 300 GHz, 3.5 kW, CW gyrotron with a cryogen free 12 T superconducting magnet, a corrugated circular waveguide and an applicator. The circular corrugated waveguide (i.d. = 6.35cm) with a corrugated period and depth of 254 /spl mu/m have been designed. The applicator have been designed both volumetric heating by uniformly distributed microwave and surface heating by a focused wave beam.

关键词： Materials processing Gyrotrons Electromagnetic heating Magnetic materials Superconducting materials Applicators Frequency Superconducting magnets Surface waves Corrugated surfaces

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