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  • 1
    Electronic Resource
    Electronic Resource
    Review of high-power microwave source research (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 3945-3974 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article reviews the state-of-the-art in high-power microwave source research. It begins with a discussion of the concepts involved in coherent microwave generation. The main varieties of microwave tubes are classified into three groups, according to the fundamental radiation mechanism involved: Cherenkov, transition, or bremsstrahlung radiation. This is followed by a brief discussion of some of the technical fundamentals of high-power microwave sources, including power supplies and electron guns. Finally, the history and recent developments of both high-peak power and high-average power sources are reviewed in the context of four main areas of application: (1) plasma resonance heating and current drive; (2) rf acceleration of charged particles; (3) radar and communications systems; and (4) high-peak power sources for weapons-effect simulation and exploratory development. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148382
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  • 2
    Electronic Resource
    Electronic Resource
    Compact all-metal high-vacuum gate valve for microwave tube research (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 3770-3773 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A manually operated all-metal high-vacuum bakable gate valve is described that is designed to attach between an electron gun and an experimental high-power microwave tube. It is designed with a minimal radial extent in order to fit within the 20 cm bore of a magnet that encloses the microwave tube. It also provides a continuous cylindrical metal boundary condition for the electron beam. The valve is used to maintain the electron gun vacuum when the remainder of the tube is brought up to atmospheric pressure for modifications. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149991
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  • 3
    Electronic Resource
    Electronic Resource
    X-band magnicon amplifier for the Next Linear Collider : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1900-1906 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnicon is a scanning-beam microwave amplifier that is being developed as a high power, highly efficient microwave source for use in powering the next generation of high gradient electron linear accelerators. This article first discusses the results from a cold cathode magnicon experiment at 11.12 GHz, driven by a single-shot Marx generator. Following this, a design is presented for a new thermionic magnicon experiment to produce more than 50 MW at 11.4 GHz, using a 210 A, 500 kV beam from an ultrahigh convergence thermionic electron gun driven by a repetition-rated modulator. This new design has a predicted efficiency in excess of 60%. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872333
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  • 4
    Electronic Resource
    Electronic Resource
    Theory of competition between synchronous and nonsynchronous modes in a magnicon output cavity (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 1760-1765 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the magnicon amplifier, a scanning electron beam drives a synchronous fast-wave interaction in a cylindrical output cavity. The output cavity is designed to support a synchronous transverse magnetic (TM) waveguide mode, usually the TM210 mode. However, a number of other transverse electric (TE) or TM modes can be excited in the cavity via a nonsynchronous, gyrotron-type interaction. To investigate the possibility of competition from these nonsynchronous modes, a multimode gyrotron simulation theory and code have been adapted to the magnicon configuration. The gyrotron theory and corresponding code have been generalized to include a synchronous TM mode as well as nonsynchronous TE modes. Proper phase averaging between the modes, and between the modes and the beam electrons, is critical to accurate mode competition calculations. In nonsynchronous interactions this is achieved by averaging with respect to electron entrance time and the orbit guiding center angle. The synchronous mode interaction is invariant with respect to these two averages; however, it is affected by the scanning angle spread, which is included via a third average over scanning angles. Calculations have been carried out to model a second-harmonic X-band magnicon experiment, which is currently underway at the Naval Research Laboratory (NRL). The output cavity has been optimized for the TM210 mode at 11.4 GHz or twice the drive frequency (ωd=5.7 GHz). The principal competing mode is the TE121 mode. The simulations show that nonsynchronous mode interactions are suppressed by the synchronous interaction if the scanning angle spread is sufficiently small (≤90° in the NRL configuration).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871324
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  • 5
    Electronic Resource
    Electronic Resource
    Ka-band circular polarization analyzer (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 36-38 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple device is described to test the circular polarization of microwave radiation. It employs two matched apertures, opposite 45° twists, and a hybrid coupler to separate and measure the two circularly polarized components of an incident wave.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139114
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  • 6
    Electronic Resource
    Electronic Resource
    Recent Advances in Microwave and Millimeter-Wave Processing of Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 3249-3254 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We are using 2.45 GHz (S-Band) microwave systems and an 83-GHz, gytrotron-based,millimeter-wave beam system in material processing and other areas. We use one 2.45 GHz systemin preparation of nanophase metals, metal mixtures and metal oxides, via the patented continuousmicrowave polyol process, with potential for large scale, low cost production. Of interest areprecious metals, mixtures of magnetic and nonmagnetic metals, and mixed metal oxides for ceramicprecursors. The other S-Band systems are used to develop repair techniques for ceramic matrixcomposites where the repairs are heated to 200-1000°C. A portable, battery-powered system isbeing developed for field repairs, and promises to be much more practical than alternativeapproaches (e.g., heating blankets). The 83-GHz system is being used in rapid sintering ofpolycrystalline ceramic materials intended for use in high power solid state lasers, where therequirement if for sintering to transparency with high optical quality and good lasing efficiency.Transparent Yb-doped yttria has been produced with hybrid conventional/millimeter-wave sinteringof nanophase powders, as well as theoretically dense YAG. Another application for the millimeterwavebeam system is in consolidation and bonding of hard coatings to light alloys, such as SiC ontitanium, where the beam system allows heating of the coating to very high temperatures withoutoverheating the metallic substrate. Finally, the millimeter-wave system is being used in thedevelopment of millimeter-wave plasma-assisted diamond deposition, where the quasi-opticalsystem has significant advantages over conventional microwave plasma-assisted diamonddeposition. Results for these various areas will be presented and discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3249.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Millimeter-Wave Assisted Sintering of Polycrystalline Yttria for Laser Host Material (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 511-514 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We report an investigation of millimeter-wave processing of yttria for fabrication oftransparent, high-strength polycrystalline laser hosts for high energy laser (HEL) applications.Advantages of polycrystalline, compared to single-crystal laser host materials, include lowerprocessing temperature, higher gain with flexibility of higher dopant concentrations, cheaperfabrication, and larger-size devices. Millimeter-wave processing is an alternative method to solvethe problems of both conventional vacuum and low-frequency microwave sintering, such as lowheating rate, poor coupling and thermal gradients. A major component of the millimeter-waveprocessing facility is a 20-kW, continuous-wave, 83-GHz gyrotron oscillator. Yttria has beensuccessfully sintered with millimeter-wave beams with up to 99% theoretical density. A partiallytransparent yttria sample has also been achieved using the millimeter-wave sintering process [1].Several factors impact the quality of the sintered material including the presence of agglomerates,impurities, processing atmosphere, sintering aids, and thermal gradients. Efforts to improve thetransparency will be discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.511.pdf
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