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检索条件"机构=Infrared Detection Technology Research and Development Center"

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

Non-axisymmetric instabilities of axially streaming electron...

引用

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...

引用

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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Application of frequency-tunable gyrotrons to ESR measurements

Application of frequency-tunable gyrotrons to ESR measuremen...

引用

International Conference on infrared and Millimeter Waves

作者： S. Mitsudo I. Higuchi I. Kalinichenko T. Idehara 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 Gyrotron FU series in Fukui University is being developed to provide a frequency-tunable source for far-infrared spectroscopy and plasma diagnostics. Submillimeter wave ESR spectrometer using gyrotrons as radiation sources and a pulse magnet for high field has been developed The ESR spectrometer has been successfully applied to several ESR measurements.

关键词： Gyrotrons Paramagnetic resonance Frequency measurement Magnetic field measurement Spectroscopy Superconducting magnets Plasma measurements Electrons Electromagnetic waveguides Plasma diagnostics

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High quality operation of high frequency gyrotron

High quality operation of high frequency gyrotron

引用

International Conference on infrared and Millimeter Waves

作者： I. Ogawa T. Idehara Y. Iwata R. Pavlichenko S. Mitsudo D. Wagner M. Thumm Engineering Fukui University of Technology Fukui Japan Faculty of Engineering Fukui University Fukui Japan Research Center for Development ofFar-Infrared Region Fukui University of Technology Fukui Japan Research Center for Development of Far-Infrared Region Fukui University Fukui Japan Max-Planck-Institut fuer Plasmaphysik Garching Germany Forschungszentrum Karlsruhe Institut for Hochleistungsimpuls-und Mikrowellentechnik Karlsruhe Germany

ISBN: (纸本)0780374231

High frequency, medium power gyrotrons (Gyrotron FU series) have been developed at Fukui University as radiation sources covering a broad frequency band from millimeter to submillimeter wave region. Conversion from the gyrotron output of circular waveguide mode into a Gaussian-like beam is useful for applications of the gyrotron to a wide field. A high mode purity output is necessary for an effective conversion. In order to improve mode purity, a nonlinear cavity which is designed using a scattering matrix code and fabricated, is installed in the Gyrotron FU VA. The measurement of radiation patterns confirmed a high purity mode operation.

关键词： Frequency Gyrotrons Electromagnetic scattering Plasma measurements Extraterrestrial measurements Electromagnetic measurements Wavelength measurement Plasma diagnostics Plasma sources Plasma waves

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Design of the collective Thomson scattering diagnostics for Large Helical Device using a quasi-optical frequency tunable gyrotron as a radiation source

Design of the collective Thomson scattering diagnostics for ...

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IEEE International Conference on Plasma Science (ICOPS)

作者： R. Pavlichenko T. Idehara I. Ogawa K. Kawahata M. Sato Research Center for Development of Far Infrared Region Fukui University of Technology Fukui Japan Cryogenic Laboratory Faculty of Engineering Fukui University of Technology Fukui Japan National Institute for Fusion Science Toki Japan

Summary form only given. development of the Collective Thomson Scattering (CTS) diagnostic system for LHD is presented. High frequency, tunable (87-97 GHz), medium power ( /spl sim/100 kW) quasi-optical gyrotron will be used as a radiation source. We will show the detailed description of the system as well as initial calculations of the scattered microwave power from the LHD plasma. Using the quasi-optical gyrotron as a radiation source was inspired by the fact that this particular device has the ability of tuning of the operational frequency. Which is made it very attractive for using under the various scenarios for LHD plasmas. It is planned that the system utilize 'forward scattering schema' of the experimental set-up. The calculation of the expected scattered power shows that (in the chosen frequency range and chosen values of the scattered angle) the dominant part of it came from the so-called 'ion-feature'. This is a situation when the incident radiation is mainly scattered by the 'shielded ions' (by electron cloud). Other advantage for using gyrotron (not 10.6 /spl mu/m CO/sub 2/ laser) as a power source is as follows. Since for the typical scattering experiments under consideration scattered wave number is k /spl sim/ k/sub i/ sin(/spl theta//sub B//2). Thus for coherent scattering to occur, it is possible to significantly increase the scattered angle /spl theta//sub B/ as a wave length of the incident radiation increases from the short wavelength (CO/sub 2/ laser) through far-infra-red (FIR) wavelength to the millimeter wavelength of gyrotrons.

关键词： Scattering Frequency Gyrotrons Tunable circuits and devices Plasma devices Plasma sources Microwave devices Plasma diagnostics Laser tuning Electrons

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Responsivity and electrical characteristics of GaN based Schottky barrier UV detectors with transparent electrode in the near UV and VUV region

Responsivity and electrical characteristics of GaN based Sch...

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Conference on Optoelectronic and Microelectronic Materials and Devices

作者： A. Motogaito K. Ohta H. Watanabe K. Hiramatsu Y. Ohuchi K. Tadatomo Y. Hamamura K. Fukui Department of Electrical and Electronic Engineering Mie University Mie Japan Photonics Laboratory Mitsubishi Cable Industries Ltd. Hyogo Japan Precision Equipment Company Nikon Corporation Sagamihara Kanagawa Japan Precision Equipment Company Nikon Corporation Kanagawa Japan Research Center for Development for Far-Infrared Region Fukui University of Technology Fukui Japan Research Center for Development for Far-Infrared Region Fukui University Fukui Japan

Responsivity spectra and electrical characteristics of GaN based Schottky type ultraviolet (UV) photodetectors with transparent electrode from the near UV region to the vacuum ultraviolet (VUV) region (3.4 to 25 eV) are described. In order to improve device performance in applying reverse bias, the annealed transparent Schottky electrode in N/sub 2/ ambient is used. The dark current of samples after annealing Schottky electrode is reduced by hundredth part of that of samples before annealing Schottky electrode. The responsivity spectra with reverse bias are improved by annealing Schottky electrode.

关键词： Electric variables Gallium nitride Schottky barriers Detectors Electrodes Photodetectors Annealing Dark current Electromagnetic wave absorption Photodiodes

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Hysteresis in gyrotrons

Hysteresis in gyrotrons

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International Conference on infrared and Millimeter Waves

作者： O. Dumbrajs T. Idehara Y. Iwata S. Mitsudo I. Ogawa B. Piosczyk Department of Engineering Physics and Mathematics Helsinki University of Technology Finland Research Center for Development of Far-Infrared Region Fukui University of Technology Fukui Japan Cryogenic Laboratory Facully of Engineering Fukui University of Technology Fukui Japan Institut für Hochleistangsimpuls-und Mikrowellentechnik Forscbungszentrum Karlsruhe Germany

We present a general theory of hysteresis in gyrotrons. The theory is illustrated by numerical examples referring to two specific gyrotrons: the FZK TE/sub 31.17/ coaxial gyrotron and the Fukui FU IV gyrotron. Corresp... 详细信息

ISBN: (纸本)0780374231

关键词： Gyrotrons Voltage Magnetic hysteresis Magnetic fields Cathodes Tellurium Electron beams Magnetic field measurement Frequency Diodes

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Measurement of carrier properties in InSb using Faraday rotation effect

Measurement of carrier properties in InSb using Faraday rota...

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International Conference on infrared and Millimeter Waves

作者： I. Ogawa K. Yamada T. Idehara A. Tsushima S. Yamaguchi Engineering Fukui University of Technology Japan Faculty of Engineering Fukui University Fukui Japan Research Center for Development of Far-Infrared Region Fukui Japan Faculfy of Engineering Yokohama National University Yokohama Japan College of Engineering Chubu University Kasugai Japan

ISBN: (纸本)0780374231

The carrier properties of n-type InSb doped with tellurium at liquid nitrogen temperature have been estimated by means of the transmission of a millimeter wave (119.3 GHz) propagating along a magnetic field up to 4 T. The information on the carrier properties is measured by the Faraday rotation arising from the difference between the phase velocities. The advantage of this method lies in the fact that it allows both the electron density and effective mass to be measured simultaneously.

关键词： Rotation measurement Magnetic field measurement Magnetic properties Millimeter wave measurements Tellurium Magnetic liquids Nitrogen Temperature Phase estimation Millimeter wave propagation

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development of high power, frequency tunable, submillimeter wave sources - Gyrotron FU series

Development of high power, frequency tunable, submillimeter ...

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International Conference on High-Power Particle Beams (BEAMS)

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

The gyrotrons developed at Fukui University (Gyrotron FU series) are high frequency, high power devices, covering a broad frequency band in the millimeter and submillimeter wavelength region. Currently, the Gyrotron FU series consists of eight gyrotrons. In this paper, we summarize and illustrate some of the achievements of the Gyrotron FU series.

关键词： Gyrotrons

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