Experimental Progress On Virtual Cathode Very High Power Microwave Source Development
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Experimental Progress On Virtual Cathode Very High Power Microwave Source Development
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Author :
language : en
Publisher:
Release Date : 1987
Experimental Progress On Virtual Cathode Very High Power Microwave Source Development written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
The evolution of rf accelerator technology toward high-power, high-current, low-emittance beams produces an ever-increasing demand for efficient, very high power microwave sources. The present klystron technology has performed very well but is not expected to produce reliable gigawatt peak-power units in the 1- to 10-GHz regime. Further major advancements must involve other types of sources. The reflexing electron sources can produce microwave powers at the gigawatt level and have demonstrated operation from 800 MHz to 40 GHz. Pulse length appears to be limited by electron-beam diode closure, and reflexing electron devices have been operated in a repetitively pulsed mode. An experiment is under way to investigate concepts to stabilize the frequency of the virtual cathode source. If one can successfully frequency and phase lock this source to an external signal, then this source can operate as a very high power microwave amplifier making it practical for accelerator applications. The progress on an experiment to test these concepts will be discussed.
High Power Microwave Source Development At Los Alamos
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Author :
language : en
Publisher:
Release Date : 1988
High Power Microwave Source Development At Los Alamos written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Experimental research is under way at Los Alamos to develop the large-orbit gyrotron and the resonant-cavity virtual cathode oscillator as very high power microwave sources. These sources, though still in an early stage of development, have demonstrated power outputs from the several hundred megawatt to the gigawatt level at various Laboratories. These devices exhibit very narrow band output, making them candidates for future accelerator drivers. Our efforts are directed toward achieving repetitively pulsed operation at pulse lengths in the microsecond regime. To provide the pulsed power for these experiments, a 1-MV, 10-kA modulator with a 1-.mu.s pulse length and a 5-Hz pulse-repetition frequency has been developed and is currently being assembled. The resonant-cavity virtual cathode source has achieved very narrow band output compared to the conventional free-running virtual cathode oscillator. Techniques are being developed for extracting the microwave power from both sources into the rectangular waveguide. The experimental effort is described and current experimental results are discussed.
Design Experimental Study Of A Dual Vircator Microwave Source
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Author : Kelton R. Clements
language : en
Publisher:
Release Date : 2012
Design Experimental Study Of A Dual Vircator Microwave Source written by Kelton R. Clements and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The research described in this thesis details the design, construction, and experimental results in developing a virtual cathode oscillator (vircator) high power microwave (HPM) source. The HPM source utilizes two independent vircators to create simultaneous microwave signals whose frequencies are variable from approximately 1 GHz to 3 GHz. The vircators are powered by a pulsed power modulator. The modulator consists of a thyratron-switched capacitor bank that pulse charges a water transmission line through a pulse transformer. An output pulse is created by a pressurized oil switch with an output risetime of 20 ns. The capacitor bank is charged to 30 kV by a bank of power supplies. A 1:10 pulse transformer charges the water line to 300 kV in approximately 2.5 ms. The output pulse from the water line is stepped up to 250 kV by an inductive adder. This signal is utilized to simultaneously drive the two, 32 [omega] vircators in parallel with a 70 ns long pulse. Experimental results were collected for both the pulsed power system as well as the dual vircator HPM source. The vircators were characterized individually first to analyze the tunability of the sources. They were then connected in parallel to show frequency independence in order to create tunable multi-frequency HPM pulses.
Development Of The Resonant Cavity Virtual Cathode And Large Orbit Gyrotron High Power Microwave Sources
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Author :
language : en
Publisher:
Release Date : 1989
Development Of The Resonant Cavity Virtual Cathode And Large Orbit Gyrotron High Power Microwave Sources written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
At Los Alamos National Laboratory, research is continuing on the development of both the resonant-cavity virtual-cathode source and the large-orbit gyrotron high-power microwave source. The resonant-cavity virtual-cathode development effort has succeeded in demonstrating narrow-band single-mode operation of this typically wide-band source. This is accomplished by supplying feedback to the oscillating virtual cathode with a resonant-cavity structure. The large-orbit gyrotron effort is developing a method for efficiently coupling the microwave power from the device so that it can be easily used as a high-power microwave generator for accelerator applications. A repetitive pulse capability is also being developed for both microwave sources. Experimental results are presented in this paper. 3 refs., 7 figs.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1994-10
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-10 with Power resources categories.
Design And Experiments With High Power Microwave Sources
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Author :
language : en
Publisher:
Release Date : 2012
Design And Experiments With High Power Microwave Sources written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Microwave And Particle Beam Sources And Directed Energy Concepts
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Author : Howard E. Brandt
language : en
Publisher:
Release Date : 1989
Microwave And Particle Beam Sources And Directed Energy Concepts written by Howard E. Brandt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Science categories.
Publications Of Los Alamos Research
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Author : Los Alamos National Laboratory
language : en
Publisher:
Release Date : 1987
Publications Of Los Alamos Research written by Los Alamos National Laboratory and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Research categories.
Proceedings Of The 1987 Ieee Particle Accelerator Conference
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Author : Eric R. Lindstrom
language : en
Publisher:
Release Date : 1987
Proceedings Of The 1987 Ieee Particle Accelerator Conference written by Eric R. Lindstrom and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Nuclear engineering categories.
Modern Microwave And Millimeter Wave Power Electronics
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Author : Gregory S. Nusinovich
language : en
Publisher: John Wiley & Sons
Release Date : 2005-04-19
Modern Microwave And Millimeter Wave Power Electronics written by Gregory S. Nusinovich and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-04-19 with Technology & Engineering categories.
A comprehensive study of microwave vacuum electronic devices and their current and future applications While both vacuum and solid-state electronics continue to evolve and provide unique solutions, emerging commercial and military applications that call for higher power and higher frequencies to accommodate massive volumes of transmitted data are the natural domain of vacuum electronics technology. Modern Microwave and Millimeter-Wave Power Electronics provides systems designers, engineers, and researchers-especially those with primarily solid-state training-with a thoroughly up-to-date survey of the rich field of microwave vacuum electronic device (MVED) technology. This book familiarizes the R&D and academic communities with the capabilities and limitations of MVED and highlights the exciting scientific breakthroughs of the past decade that are dramatically increasing the compactness, efficiency, cost-effectiveness, and reliability of this entire class of devices. This comprehensive text explores a wide range of topics: Traveling-wave tubes, which form the backbone of satellite and airborne communications, as well as of military electronic countermeasures systems Microfabricated MVEDs and advanced electron beam sources Klystrons, gyro-amplifiers, and crossed-field devices "Virtual prototyping" of MVEDs via advanced 3-D computational models High-Power Microwave (HPM) sources Next-generation microwave structures and circuits How to achieve linear amplification Advanced materials technologies for MVEDs A Web site appendix providing a step-by-step walk-through of a typical MVED design process Concluding with an in-depth examination of emerging applications and future possibilities for MVEDs, Modern Microwave and Millimeter-Wave Power Electronics ensures that systems designers and engineers understand and utilize the significant potential of this mature, yet continually developing technology. SPECIAL NOTE: All of the editors' royalties realized from the sale of this book will fund the future research and publication activities of graduate students in the vacuum electronics field.