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International Conference on Vacuum Electronics

作者： Weihua Jiang Koichiro Hashimoto Kohei Itoh Masaki Daimon Toshiaki Hayashi Teruo Saito Toshitaka Idehara Masaki Kamada Extreme Energy-Density Research Institute Nagaoka University of Technology Nagaoka Niigata JAPAN Research Center for Development of Far-Infrared Region University of Fukui Fukui JAPAN Japan Atomic Energy Agency Fusion Research and Development Directorate Naka Ibaraki JAPAN

High power far-infrared radiations are expected to have wide applications in material development, medical analysis, and plasma diagnostics. We are developing large orbit gyrotron (LOG) as high-power radiation source for the frequency range of 100 GHz - 1 THz. The studies were carried out through both experimental and simulation approaches.

关键词： Gyrotrons Electron beams Magnetic resonance Magnetic fields Power generation Pulse generation Coils Space vector pulse width modulation Diodes Telephony

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Synthesis and Spectral Properties of Nd^(3+)∶Gd_3Ga_5O_(12) Nanopowder for Transparent Laser Ceramics

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Journal of Rare Earths 2006年第4期24卷 443-446页

作者：田雪雁张希艳李银柱杨培志 Uncooled Infrared Research and Development Center Kunming Institute of Physics Kunming 650223ChinaSchool of Materials Science and Engineering Changchun University of Science and Technology Changchun 130022China School of Materials Science and Engineering Changchun University of Science and Technology Changchun 130022China Uncooled Infrared Research and Development Center Kunming Institute of Physics Kunming 650223China

Nd^3＋： Gd3Ga5O12（Nd ： GGG） nanopowder for transparent laser ceramics was synthesized using sol-gel method. XRD, SEM, and fluorescence spectrum were used to study the properties of Nd^3＋：Gd3Ga5O12 nanopowder. XRD patterns of samples show that it has a cubic structure. Meanwhile, pure Nd：GGG crystals were obtained at 1000 ℃ for 12 h. SEM photographs show that dispersed, uniform, ball-like Nd：GGG nanopowder is obtained. Both XRD and SEM results show that the crystallization degree and the grain size increase with the increase in calcining temperature. Analysis of fluorescence spectrum shows that fluorescence emission occurs at 1062.7 nm, which is the result of Nd^3＋（^4F3/2→^4I11/2） transition. Homogenous Nd ： GGG nanopewder with a small grain size synthesized using the sol-gel method is favorable for sintering the transparent ceramic, which proves that the nanopewder obtained is suitable as a precursor for preparing GGG transparent ceramics.

关键词： transparent ceramic Nd^3＋： Gd3Ga5O12 sol-gel method nanopowder rare earths

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Workshop on imaging science development for cancer prevention and preemption

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Cancer Biomarkers 2007年第1期3卷 1-33页

作者： Kelloff, Gary J. Sullivan, Daniel C. Baker, Houston Clarke, Lawrence P. Nordstrom, Robert Tatum, James L. Dorfman, Gary S. Jacobs, Paula Berg, Christine D. Pomper, Martin G. Birrer, Michael J. Tempero, Margaret Higley, Howard R. Petty, Brenda Gumbs Sigman, Caroline C. Maley, Carlo Sharma, Prateek Wax, Adam Ginsberg, Gregory G. Dannenberg, Andrew J. Hawk, Ernest T. Messing, Edward M. Grossman, H. Barton Harisinghani, Mukesh Bigio, Irving J. Griebel, Donna Henson, Donald E. Fabian, Carol J. Ferrara, Katherine Fantini, Sergio Schnall, Mitchell D. Zujewski, Jo Anne Hayes, Wendy Klein, Eric A. DeMarzo, Angelo Ocak, Iclal Ketterling, Jeffrey A. Tempany, Clare Shtern, Faina Parnes, Howard L. Gomez, Jorge Srivastava, Sudhir Szabo, Eva Lam, Stephen Seibel, Eric J. Massion, Pierre McLennan, Geoffrey Cleary, Kevin Suh, Robert Burt, Randall W. Pfeiffer, Ruth M. Hoffman, John M. Roy, Hemant K. Wang, Thomas Limburg, Paul J. El-Deiry, Wafik S. Papadimitrakopoulou, Vali Hittelman, Walter N. MacAulay, Calum Veltri, Robert W. Solomonzz, Diane Jeronimo, Jose Richards-Kortum, Rebecca Johnson, Karen A. Viner, Jaye L. Stratton, Steven P. Rajadhyaksha, Milind Dhawan, Atam NIH/NCI/DCTD Cancer Imaging Program Bethesda MD United States NIH/NCI/DCTD Cancer Imaging Program NCI-Frederick Frederick MD United States NIH/NCI/DCP Early Detection Research Group Bethesda MD United States The Johns Hopkins University School of Medicine Departments of Radiology Pharmacology and Oncology Division of Neuroradiology Baltimore MD United States NIH/NCI/CCR Cell and Cancer Biology Branch Bethesda MD United States University of California San Francisco Department of Medicine Division of Medical Oncology San Francisco CA United States CCS Associates Inc. Mountain View CA United States Wistar Institute Molecular and Cellular Oncogenesis Program Philadelphia PA United States University of Kansas School of Medicine VA Hospital Kansas City MO United States Duke University Department of Biomedical Engineering Medical Physics Program Durham NC United States University of Pennsylvania School of Medicine Department of Gastroenterology Philadelphia PA United States New York Presbyterian Hospital Weill Medical College of Cornell University New York NY United States NIH/NCI/OD Office of Centers for Training and Resources Bethesda MD United States University of Rochester Medical Center Department of Urology Rochester NY United States University of Texas MD Anderson Cancer Center Department of Urology Houston TX United States Massachusetts General Hospital Abdominal Imaging/Interventional Radiology Boston MA United States Boston University Biomedical Engineering Electrical and Computer Engineering and Physics Boston MA United States NIH/NCI/DCP Gastrointestinal and Other Cancers Research Group Bethesda MD United States The George Washington University Cancer Institute Office of Cancer Prevention and Control Washington DC United States University of Kansas Cancer Center Clinical Oncology Kansas City KS United States University of California Davis Department of Biomedical Engineering Davis CA United States Tufts University De

The concept of intraepithelial neoplasm (IEN) as a near-obligate precursor of cancers has generated opportunities to examine drug or device intervention strategies that may reverse or retard the sometimes lengthy process of carcinogenesis. Chemopreventive agents with high therapeutic indices, well-monitored for efficacy and safety, are greatly needed, as is development of less invasive or minimally disruptive visualization and assessment methods to safely screen nominally healthy but at-risk patients, often for extended periods of time and at repeated intervals. Imaging devices, alone or in combination with anticancer drugs, may also provide novel interventions to treat or prevent precancer.

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Plasma Scattering Measurement using a Submillimeter Wave Gyrotron as a Radiation Source

Plasma Scattering Measurement using a Submillimeter Wave Gyr...

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International Conference on infrared and Millimeter Waves

作者： I. Ogawa T. Idehara M. Myodo T. Saito T. Hori H. Park E. Mazzucato Research Center for Development of Far-Infrared Region University of Fukui Fukui Japan National Institute of Information and Communications Technology Koganei Japan Princeton Plasma Physics Laboratory Princeton NJ USA

Application of an intense, high quality, well-collimated probe beam is effective in improving the performance of the measurement. Such probe beam is produced by stabilization of the high frequency gyrotron output and ... 详细信息

关键词： Plasma measurements Submillimeter wave measurements Plasma sources Plasma waves Scattering Gyrotrons Probes Plasma applications Particle beam measurements Frequency conversion

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Experimental results of high-power, short-pulse, large orbit gyrotron using a pulse power generator "ETIGO-IV"

Experimental results of high-power, short-pulse, large orbit...

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International Conference on infrared and Millimeter Waves

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

An ultra-high power gyrotron is being developed in millimeter and submillimeter wavelength region. It is a large orbit gyrotron (LOG) with an intense relativistic electron beam (IREB). A pulsed power generator "ETIGO-IV" is used for IREB generation. The prototype LOG with a pulse magnet has been constructed. The first operation test was successfully carried out in millimeter wavelength region. The experimental results are presented.

关键词： Gyrotrons Power generation Pulse generation Power harmonic filters Electron beams Pulse amplifiers Millimeter wave technology Submillimeter wave technology Coils Cathodes

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Numerical Study of the Hamiltonian Gyrotron Map

Numerical Study of the Hamiltonian Gyrotron Map

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International Conference on infrared and Millimeter Waves

作者： O. Dumbrajs Y. Kominis K.A. Avramides K. Hizanidis J.L. Vomvoridis Association Euratom-Tekes Helsinki University of Technology Finland Research Center for Development of Far-Infrared Region University of Fukui Fukui Japan School of Electrical and Computer Engineering Association Euratom-Hellenic Republic National and Technical University of Athens Zografou Greece

ISBN: (纸本)1424403995

The recently derived Hamiltonian map for description of electron dynamics replaces the original continuous gyrotron differential equation by a discrete iterative map which runs much faster on computers than the small-step standard numerical integration methods, such as Runge-Kutta. It allows a significant reduction of the number of iteration steps required for acceptable accuracy. The gyrotron map is studied numerically for different combinations of gyrotron operating parameters.

关键词： Gyrotrons Electrons Plasmas Trajectory Radio frequency Differential equations Iterative methods Standards development Microwave devices Microwave theory and techniques

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Kikuchi et al. Reply:

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Physical Review Letters 2006年第8期97卷 089702-089702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 Japan Atomic Energy Research Institute SPring-8 Mikazuki Hyogo 679-5148 Japan Faculty of Science Toyama University Toyama 930-8555 Japan Molecular Photoscience Research Center Kobe University Kobe 657-8501 Japan

A Reply to the Comment by Bo Gu and Gang Su.

关键词： Professional aspects

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development of an Ultra High Frequency Gyrotron with a Pulsed Magnet

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AIP Conference Proceedings 2006年第1期807卷 197-205页

作者： T. Idehara M. Kamada H. Tsuchiya T. Hayashi La Agusu S. Mitsudo I. Ogawa V. N. Manuilov K. Naito T. Yuyama W. Jiang K. Yatsui 1Research Center for Development of Far Infrared Region University of Fukui Bunkyo 3‐9‐1 Fukui‐shi 910‐8507 Japan 2Radiophysical Department of Nizhny Novgorod State University 690005 Gagarin av. 23 Nizhny Novgorod Russia 3Extreme Energy‐Density Research Institute Nagaoka University of Technology Kamitomioka 1603‐1 Nagaoka‐shi Niigata 940‐2188 Japan

An ultra‐high frequency gyrotron is being developed as a THz radiation source by using a pulsed magnet. We have achieved the highest field intensity of 20.2 T. High frequency operation at the second harmonic will achieve 1.01 THz; the corresponding cavity mode is TE6,11,1. On the other hand, an ultra‐high power gyrotron with a pulsed magnet is also being developed as a millimeter to submillimeter wave radiation source. The gyrotron is a large orbit gyrotron (LOG) using an intense relativistic electron beam (IREB). A pulsed power generator “ETIGO‐IV” is applied for generation of the IREB. A prototype relativistic LOG was constructed for fundamental operation. The output of the LOG will achieve 144 GHz and 9 MW; the corresponding cavity mode is TE1,4,1. Cavities for 2nd and 4th harmonic operations were designed by numerical simulation for achievement of higher frequency. The progress of development for prototype high frequency gyrotrons with pulsed magnets is presented.

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

Plasma scattering measurement using a submillimeter wave gyr...

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International Conference on infrared and Millimeter Waves

作者： I. Ogawa T. Idehara M. Myodo M. Kamada T. Hori H. Park E. Mazzucato 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 Fukui Japan National Institute of Information and Communications Technology Koganei Japan Princeton Plasma Physics Laboratory Princeton New Jersey USA

Application of high intensity, well-collimated submillimeter probe beam is effective in improving the S/N ratio and the spatial resolution of plasma scattering measurement. High quality operation of the gyrotron and production of well-collimated Gaussian-like beam are required to improve the performance of the measurement. The high quality operation can be achieved by decreasing the fluctuations of the cathode voltage. Gyrotron output is converted into Gaussian-like beam by quasi-optical system consisting of a quasi-optical antenna and focusing mirrors.

关键词： Plasma measurements Submillimeter wave measurements Plasma sources Plasma waves Scattering Gyrotrons Plasma applications Particle beam measurements Gaussian processes Probes

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High quality operation of a submillimeter wave gyrotron

High quality operation of a submillimeter wave gyrotron

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International Conference on infrared and Millimeter Waves

作者： I. Ogawa T. Idehara H. Hoshizuki M. Myodo K. Nagao S. Mitsudo T. Hori Research Center for Development of Far-Infrared Region Fukui University of Technology Bunkyo Fukui Japan National Institute of Information and Communications Technology Koganei Japan

The outputs (cw operation, f=301 GHz, P/spl sim/20W) of the Gyrotron FU IV are stabilized up to /spl Delta/P/P/spl sim/1% and /spl Delta/f/spl sim/50 kHz by decreasing the fluctuations of the cathode voltage and the anode voltage (/spl Delta/V/sub k/ /spl sim/ 0.6V, /spl Delta/V/sub a/ /spl sim/ 0.2 V), via introducing smoothing circuits consisting of resistors, induction coils and capacitors. Further stabilization of output frequency (/spl Delta/f< 1 kHz, /spl Delta/f/f<3/spl times/10/sup -9/) is attained by applying phase lock control. A carefully designed cavity resonator with nonlinear up-taper has been developed and implemented in Gyrotron FU VA. The measurements of the radiation patterns have confirmed high-purity mode operations. The output radiation of TE/sub 03/ and TE/sub 13/ modes are converted into bi-Gaussian beams by a quasioptical system.

关键词： Gyrotrons Voltage Tellurium Fluctuations Cathodes Anodes Smoothing methods Circuits Resistors Coils

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