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Millimeter wave ESR measurements in the frustrated antiferromagnetic spin chain system LiCu/sub 2/O/sub 2/

Millimeter wave ESR measurements in the frustrated antiferro...

引用

International Conference on infrared and Millimeter Waves

作者： T. Fujita S. Mitsudo G. Goda T. Idehara M. Motokawa A. Bush A. Vasiliev Research Center for Development of for Infrared Region Fukui University of Technology Fukui Japan Research Center for Development of Far Infrared Region Fukui University Fukui Japan Moscow Institute of Radiotechnics Electronics and Automation Moscow Russia Low Temperature Physics Department Moscow State University Moscow Russia

Millimeter wave ESR measurements were performed in high magnetic field on the frustrated antiferromagnetic spin chain system LiCu/sub 2/O/sub 2/. This system has been thought to be a dimer liquid state, which collapses into an antiferromagnetic order transition at 23 K. The absorptions in the ESR spectra were observed both in the dimer liquid state and the ordered state. The line width and resonance field of the ESR spectra in the ordered state shows monotonical temperature dependence, which may indicate the absence of the additional ordered state below 9 K proposed by the other group. The frequency dependence at 4 K were performed in the ordered state up to 220 GHz. Unusual features were realized which crosses the resonance field of the g=2. This feature differs from the one in the simple antiferromagnetic resonance.

关键词： Paramagnetic resonance Antiferromagnetic materials Magnetic field measurement Frequency dependence Temperature dependence Copper Frequency measurement Magnetic resonance Diodes Oscillators

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Plasma scattering measurement by using a submillimeter wave gyrotron as a radiation source

Plasma scattering measurement by using a submillimeter wave ...

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International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter, and Submillimeter Waves

作者： I. Ogawa T. Idehara Y. Itakura T. Hori D. Wagner M. Thumm Research Center for Development of Far-Infrared Region Fukui University of Technology Fukui Japan Research Center for Development of Far-Infrared Region Fukui University Bunkyo Japan Basic Research Center Communications Research Laboratories Koganei Japan Basic Research Center Communications Research Laboratory Koganei Japan Forschungszentrum Karlsruhe Institut für Hochleistungsimpuls und Mikrowellentechnik Karlsruhe Germany Max-Planck-Institut für Plasmaphysik Garching Germany

An FU II gyrotron was applied as a submillimeter wave radiation source for plasma scattering measurements of the compact helical system (CHS) in the National Institute for Fusion Science (NIFS) in Japan. The stabilization of the gyrotron output and the high quality probe beam are required to improve the performance of the measurements. The outputs (cw operation, f=301 GHz, P/spl sim/20 W) of the FU IV gyrotron are stabilized (/spl Delta/P/P/spl sim/1%, /spl Delta/f/spl sim/10 kHz) by decreasing the fluctuations of the potentials (/spl Delta/V/sub k//spl sim/0.6 V, /spl Delta/V/sub a//spl sim/0.2 V), by introducing smoothing circuits consisting of a resistor, an induction coil and a capacitor. Further stabilization of output frequency (/spl Delta/f<1 kHz) is attained by applying a phase lock loop. A high purity mode operation is a prerequisite for effective conversion of the output radiation into the probe beam for scattering measurements. We have constructed a new gyrotron, namely, the FU VA gyrotron, which has a carefully designed resonant cavity. The measurements of the radiation patterns have confirmed high-purity mode operation.

关键词： Plasma measurements Plasma sources Plasma waves Scattering Submillimeter wave measurements Gyrotrons Submillimeter wave devices Probes Nuclear and plasma sciences Particle beam measurements

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development of a short pulse, high power, large orbit gyrotron using a high voltage pulse supply ETIGO-IV

Development of a short pulse, high power, large orbit gyrotr...

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International Conference on infrared and Millimeter Waves

作者： M. Kamada T. Idehara L. Agusu V. Manuilov K. Yatsui W. Jiang Research Center for Development of Far Infrared Region University of Fukui Fukui-shi Japan Research Center for Development of for Infrared Region University of Fukui Fukui Japan Radiophysical Faculty Nizhny Novgorod State University Nizhny Novgorod Russia Extremely High-Energy Density Research University of Technology Nagaoka-shi Niigata-ken Japan Extremely High-Energy Density Research Institute Nagaoka University of Technology Nagaoka Niigata Japan

A high power gyrotron using pulsed power generator ETIGO-IV is being developed. The typical output waveform to a matched load of ETIGO-IV is 400 kV in peak voltage, 13 kA in peak current and 120 ns in pulse length. The combination of high energy electron beam with such a power supply and a high magnetic field opens the possibility of submillimeter wave generation with an output power above 1 MW to a large orbit gyrotron.

关键词： Gyrotrons Voltage Magnetic fields Power generation Electron beams Power supplies Cathodes Pulsed power supplies Coils Pulse generation

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Electron gun for powerful large orbit gyrotron

Electron gun for powerful large orbit gyrotron

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International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter, and Submillimeter Waves

作者： V.N. Manuilov T. Idehara O. Watanabe M. Kamada La Agusu K. Yatsui Wiehua Jiang Research Center for Development of Far-Infrared Region Fukui University of Technology Fukui Japan Radiophysical Department Nizhny Novgorod State University Nizhny Novgorod Russia Extreme Energy Density Research Institute Nagaoka Institute of Technology Nagaoka Niigata Japan

One of the most important tasks in high power electronics is the development of RF sources in the submillimeter wavelength region. One of the most promising sources is the large orbit gyrotron (LOG). But the efficiency of LOGs is rather small - usually a few percent only. So, to obtain a high enough value of the output power, it is necessary to use a powerful electron beam as the RF radiation energy source. Recently in the Nagaoka Institute of technology, a Marx generator with accelerating voltage U/sub o/ of about 400 kV was developed. The combination of such a power supply with a pulse magnet providing an operating magnetic field of 12 T opens the possibility of a LOG to reach the border of the Terahertz frequency range with output power above 1-2 MW. This paper presents a project designing an electron beam formation system with the mentioned power supply. The operation of a LOG at third to fifth cyclotron harmonics is also discussed.

关键词： Gyrotrons Pulsed power supplies Radio frequency Power generation Electron beams Power electronics Submillimeter wave technology Acceleration Voltage Magnetic fields

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Ultra high temperature sintering by using 24 GHz gyrotron

Ultra high temperature sintering by using 24 GHz gyrotron

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International Conference on High-Power Particle Beams (BEAMS)

作者： Seitaro Mitsudo Hisanori Hoshizuki Kazunari Matsuura Tasaburo Saji Toshitaka Idehara Mikhail Yu. Glyavin Anatolii G. Eremeev Tmomi Honda Yoshiro Iwai Akihiro Kitano Junichi Ishibashi Hiroshi Nishi 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 Department of Mechanical Engineering Fukui University of Technology Fukui Japan Tsuruga Head Office Japan Nuclear Cycle Development Institute Tsuruga Fukui Japan

Boron carbide (B 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 4 C ceramics were performed under flowing argon gas using the sintering system. The sintered samples were characterized by the density, the shrinkage and SEM micrographs of fracture surface. Above the temperature of 2000°C, the shrinkage and the grain grows were observed.

关键词： Argon Amplitude shift keying

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Powerful large orbit gyrotron of submillimeter wavelength range

Powerful large orbit gyrotron of submillimeter wavelength ra...

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International Conference on infrared and Millimeter Waves

作者： T. Idehara O. Watanabe M. Kamada L. Agusu K. Yatsui W. Jiang V.N. Manuilov M.Yu. Glyavin Research Center for Development of Far-Infrared Region University of Fukui Fukui Japan Extremely High-Energy Density Research Institute Nagaoka University of Technology Nagaoka Niigata Japan Radiophysical Department Nizhny Novgorod State University Nizhny Novgorod Rusia Institute of Applied Physics Russian Academy of Sciences GYCOM Ltd Nizhny Novgorod Russia

Preliminary design of cavity for high power submillimeter large orbit gyrotron has been described. Time-dependent, multi-mode calculation gives us the possibility to achieve output power of up to 1.5 MW with a frequency 420.8 GHz at third harmonic. The most important advantages of LOG are possibility of selective excitation of high harmonic number. However, due to low efficiency of this devices (typically a few percents), high output power needs powerful electron beams.

关键词： Gyrotrons Power generation Frequency Magnetic fields Pulsed power supplies Voltage Submillimeter wave technology Electron beams Q factor Physics

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Sintering of high-quality ceramics using a compact gyrotron system

Sintering of high-quality ceramics using a compact gyrotron ...

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IEEE International Conference on Plasma Science (ICOPS)

作者： H. Hoshizuki T. Kuroda S. Mitsudo T. Idehara M. Glyavin A. Eremeev F. Tanahashi T. Honda Y. Iwai 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 Depratiment of Mechanical Engineering Faculty of Engineering Fukui University of Technology Fukui Japan

Summary form only given, as follows. We report a sintering experiment of alumina (Al/sub 2/O/sub 3/) and B/sub 4/C ceramics by using a compact gyrotron system. A 2.5 kW, 24 GHz compact gyrotron is used as a microwave ... 详细信息

关键词： Ceramics Gyrotrons Electromagnetic heating Temperature Physics Boron Mechanical engineering Frequency Electron beams Voltage

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Non-axisymmetric instabilities of axially streaming electron beam in periodically corrugated cylindrical waveguide

Non-axisymmetric instabilities of axially streaming electron...

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IEEE International Conference on Plasma Science (ICOPS)

作者： H. Yamazaki K. Ogura O. Watanabe Y. Yamashita Graduate School of Science and Technology Niigata University 8050 Igarashi ninocho Niigatashi Niigata Daigaku Niigata Niigata JP Graduate Sch. of Sci. & Technol. Niigata Univ. Japan Japan Research Center for Development of Far-Infrared Region Fukui University 3-9-1Bunkyo Fukui Japan

Summary form only given, as follows. We study beam instabilities by developing a new version of self-consistent, linear theory considering three dimensional beam perturbations.

关键词： Electron beams Cyclotrons Magnetrons Magnetic resonance Magnetic fields Electromagnetic waveguides Electromagnetic scattering Equations Ceramics industry Food industry

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A quasi-optical system converting an output radiation of a gyrotron into a Gaussian beam

A quasi-optical system converting an output radiation of a g...

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International Conference on infrared and Millimeter Waves

作者： I. Ogawa H. Nozu T. Idehara R. Pavlichenko Engineering Fukui University of Technology Fukui Japan Research Center for Development of Far-Infrared Region Fukui University of Technology Fukui Japan

ISBN: (纸本)0780374231

High frequency gyrotrons are characterized by their abilities to deliver high powers in submillimeter wavelength range and the frequency step-tunability. Practically all applications require Gaussian beams as a power source. The quasi-optical system consisting of a quasi-optical antenna, two focusing mirrors and a filter is appropriate as a transmission line for frequency tunable gyrotrons operating at TE/sub 0n/ mode. As an illustration of our approach, we present results which demonstrate the applicability of the developed system for conversion of the radiation generated by the Gyrotron FU IVA. The examples include conversions of three TE/sub 0n/ modes (TE/sub 02/, 223 GHz; TE/sub 03/, 323 GHz; TE/sub 04/, 423 GHz) into Gaussian-like beams.

关键词： Gyrotrons Mirrors Equations Electromagnetic fields Submillimeter wave filters Power transmission lines Tellurium Plasma measurements Frequency conversion Power engineering and energy

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Present status of submillimeter wave gyrotron series in Fukui University

Present status of submillimeter wave gyrotron series in Fuku...

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International Conference on infrared and Millimeter Waves

作者： T. Idehara S. Mitsudo R. Pavlichenko I. Ogawa Research Center for Development of Far-Infrared Region Fukui University of Technology Fukui Japan Cryogenic Laboratory Engineering Fukui University of Technology Fukui Japan

ISBN: (纸本)0780374231

The gyrotrons developed in Fukui University ("Gyrotron FU series") are high frequency, medium power devices, covering a broad frequency band in the millimeter and submillimeter wavelength region. The output frequency can be modulated by the modulation of beam electron energy. While a phase lock control of the energy makes the output frequency highly stable. A high power, high stability submillimeter wave source has just been realized. In this paper, recent advances of Gyrotron FU series are described.

关键词： Gyrotrons Frequency modulation Electron beams Voltage Amplitude modulation Phase locked loops Submillimeter wave devices Optical modulation Cyclotrons Cathodes

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