High Power, Millimeter-Wavelength, Coherent Radiation Sources PDF Download
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Author: John E. Walsh
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Book Description
A summary of the results of the Cerenkov Maser development is presented. During the course of this work, operation over the spectral range extending from just below 30 GHz to just above 300 GHz was demonstrated. Sources based upon high-power microwave-tube technology and sources driven by pulse-power generators were both used to drive Cerenkov Masers. In the former type, 10% efficiency from single-pass, untapered resonators were obtained, while in the latter, efficiency was in the 0.1-1% range. Extensive computer codes describing linear and nonlinear aspects of Cerenkov Master operation were also developed.
Author: John E. Walsh
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Book Description
A summary of the results of the Cerenkov Maser development is presented. During the course of this work, operation over the spectral range extending from just below 30 GHz to just above 300 GHz was demonstrated. Sources based upon high-power microwave-tube technology and sources driven by pulse-power generators were both used to drive Cerenkov Masers. In the former type, 10% efficiency from single-pass, untapered resonators were obtained, while in the latter, efficiency was in the 0.1-1% range. Extensive computer codes describing linear and nonlinear aspects of Cerenkov Master operation were also developed.
Author: P. Sprangle
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Book Description
In recent years, there has been considerable renewed interest in the development of novel devices for the production of high power coherent electromagnetic radiation. This interest has been motivated largely by the realization that, with existing technology, certain processes utilizing relativistic electron beams can produce coherent electromagnetic radiation at power levels far in excess of those achieved by conventional electron devices. This paper will review the current status of this rapidly developing field, with emphasis on two generic devices. The major thrust in the recent development of electron beam driven radiation sources has been directed towards achieving shorter wavelengths, greater power and higher efficiencies. Shortly after the development of such successful sources as the magnetron, kylstron and various traveling wave devices, it became clear that, in their original form, they were limited in their ability to produce high levels of radiation efficiently at short wavelengths. To circumvent the inherent limitations of these conventional coherent radiation sources, many new concepts and mechanisms, as well as variations on conventional concepts, were proposed. This paper is concerned primarily with two devices which are, relatively speaking, newcomers to the list of coherent classical radiation sources. They are the free electron laser and the cyclotron resonance maser (CRM); one well known type of CRM is the gyrotron.
Author: Kenneth J. Button
Publisher: Elsevier
ISBN: 0323152775
Category : Technology & Engineering
Languages : en
Pages : 376
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Book Description
Infrared and Millimeter Waves, Volume 13: Millimeter Components and Techniques, Part IV compiles the work of several authors while focusing on certain aspects of infrared and millimeter waves, such as sources of radiation, instrumentation, and millimeter systems. This volume covers millimeter components and techniques. This text first covers the use of powerful gyrotrons for thermonuclear research, and then discusses high-power coherent radiation sources. Kinetic theory of harmonic gyrotron oscillator with slotted resonant structure is the focus of Chapter 3, while integrated fin-line components for communication, radar, and radiometer applications is the subject of Chapter 4. The fifth chapter discusses propagation and mode coupling in corrugated and smooth-wall circular waveguides. Chapter 6 discusses far-infrared properties of inhomogeneous materials, and the last chapter covers solid-state spectroscopy with far-infrared continuous-wave lasers. This book will be of great use to researchers or professionals whose work involves infrared and millimeter waves.
Author: A.W. Saenz
Publisher: Springer Science & Business Media
ISBN: 3642511856
Category : Science
Languages : en
Pages : 246
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Book Description
Energetic electromagnetic radiation finds frequent uses in science (e. g. , for expe riments in nuclear and elementary - particle physics), in technology (for materials testing), and in medicine (for medical X-rays). The most common method of genera ting such radiation is via the process of "bremsstrahlung" (a German term coined by A. Sommerfeld, meaning "braking radiation") in which a beam of electrons is direc ted into matter (e. g. , a metal target), losing energy during its collisions with the atoms and releasing this energy in the form of emitted radiation. The character of such radiation may be drastically changed by the use of a tar get with periodic structure (most commonly, a crystal target). The coherent waves emitted from individual crystal atoms interfere with each other, monochromatizing and polarizing the radiation and often increasing its intensity manifold, thereby creating a powerful radiation source of high quality for purposes of scientific and technical applications. This is true both for the well - established "coherent bremsstrahlung" process in which the interfering radiation is emitted while the electrons cross a succession of crystal planes, as well as for the more recently discovered process of "channeling radiation" (generating radiation of even higher intensity, but lower energy) in which the radiation is emitted while the electrons propagate along a crystal plane, or a crystal axis, in an oscillatory fashion.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
As described by the title the grant funds were used to support a project whose primary goal was the development of tunable coherent sources for the THz-FIR region of the spectrum. The THz or more generally the FIR extends from 0.3 x 10(exp 12) (0.3THz) to 30 x 10(exp 12) (30THz) or alternatively from a wavelength of 1 mm down to a wavelength of 10 gm. It is a range of the spectrum that has been a long standing challenge. Microwave technology which has been extraordinarily successful at wavelengths longer than 1 mm and classical and quantum optical techniques which are extremely effective in the visible, near and mid infrared regions of the spectrum encounter fundamental challenges when extended (respectively) to longer or shorter wavelengths. Continued interest in "opening up" and exploiting the FIR region of the spectrum is based on the scientific questions which in part demand an access to the THz-FIR spectral range. These extend from atmospheric and biophysics to plasma physics and radio astronomy. Important technological applications also exist. Among the examples would be radar modeling, characterization of the response of near millimeter wave (NMMW) systems and the potential for short range high resolution radar. The immediate scientific and engineering goals of the project supported by the equipment grant provide a source that is tunable, narrow band and provides sufficient power for spectroscopic investigations. In the longer term a compact conveniently packaged sources and potential and requirements needed to reach higher power operation are of interest. The grating couples the beam with the electromagnetic field provides distributed feedback which reacts back on the beam and in turn leads to bunching of the beam. The density bunches produce the coherent operation.
Author: Machavaram V. Kartikeyan
Publisher: Springer Science & Business Media
ISBN: 3662076373
Category : Technology & Engineering
Languages : en
Pages : 234
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Book Description
Drawing on the author's wide experience, this book gives a comprehensive review of the state of the art in gyrotron technology, covering the theory, design and applications. The book includes an extensive references list which provides an excellent guide to the related literature.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 320
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Book Description
Author: A.W. Saenz
Publisher: Springer
ISBN: 9783642511875
Category : Science
Languages : en
Pages : 235
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Book Description
Energetic electromagnetic radiation finds frequent uses in science (e. g. , for expe riments in nuclear and elementary - particle physics), in technology (for materials testing), and in medicine (for medical X-rays). The most common method of genera ting such radiation is via the process of "bremsstrahlung" (a German term coined by A. Sommerfeld, meaning "braking radiation") in which a beam of electrons is direc ted into matter (e. g. , a metal target), losing energy during its collisions with the atoms and releasing this energy in the form of emitted radiation. The character of such radiation may be drastically changed by the use of a tar get with periodic structure (most commonly, a crystal target). The coherent waves emitted from individual crystal atoms interfere with each other, monochromatizing and polarizing the radiation and often increasing its intensity manifold, thereby creating a powerful radiation source of high quality for purposes of scientific and technical applications. This is true both for the well - established "coherent bremsstrahlung" process in which the interfering radiation is emitted while the electrons cross a succession of crystal planes, as well as for the more recently discovered process of "channeling radiation" (generating radiation of even higher intensity, but lower energy) in which the radiation is emitted while the electrons propagate along a crystal plane, or a crystal axis, in an oscillatory fashion.
Author: Kenneth J. Button
Publisher:
ISBN:
Category : Infra-red apparatus and appliances
Languages : en
Pages : 362
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Book Description
Author: Lutz Leopold
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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Book Description
The transmission characteristics of thin Al films (about 200A) for 100 GHz radiation was measured. The superconducting films were put into various non-equilibrium states by illuminating them with an Ar laser where power was changed from zero to 500 MW. The conclusion of the work is that the films are not heated in agreement with previous results. (Author).
