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Study Of Microwave Generation By Means Of Interaction With Anisotropic Media
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Book Synopsis Study of Microwave Generation by Means of Interaction with Anisotropic Media by : John M. Osepchuk
Download or read book Study of Microwave Generation by Means of Interaction with Anisotropic Media written by John M. Osepchuk and published by . This book was released on 1966 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: A stacked, layered material is prepared by brazing molybdenum and steel sheets. Techniques are established for making a layered anisotropic material of boron nitride and zirconium diboride. The gain of an admittance wall amplifier using a pyrolytic graphite cylinder is computed. Amplification is predicted over a wide frequency band. (Author).
Book Synopsis Study of Microwave Generation by Means of Electron Beam Interaction with Anisotropic Media by : S. F. PAIK
Download or read book Study of Microwave Generation by Means of Electron Beam Interaction with Anisotropic Media written by S. F. PAIK and published by . This book was released on 1965 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The possibility of generating a microwave signal by means of an interaction between electron streams and various anisotropic media is investigated. In particular, properties of microwave slow-wave systems made of plasmas and pyrolytic graphites are studied to determine the feasibility of utilizing such slow-wave systems as circuits in beam-type microwave oscillators. Results of an experimental study on the surface-wave mode (backward-wave) of propagation in annular plasma columns is presented. Properties of the positive column of a dc discharge contained within two co-axial glass tubings are measured, and some basic differences between the discharge column and the ideal model of the plasma used for the analysis are pointed out. The density distribution is shown to be non-uniform, and the variation of the density profile with axial magnetic field is noted. Surface-wave modes of propagation predicted from the uniform quiescent plasma model are observed experimentally. The attenuation of the wave is observed to increase rapidly when a small magnetic field in the axial direction is applied. A theory of resonance absorption mechanism which occurs as a result of a gross density inhomogeneity is presented as a possible explanation for the enhanced attenuation observed.
Book Synopsis Microwave Generation by Means of Interaction with Anisotropic Media by :
Download or read book Microwave Generation by Means of Interaction with Anisotropic Media written by and published by . This book was released on 1968 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: A perturbation analysis is carried out for a nonlinear beam-plasma system in which a modulated electron beam passes through a stationary cold-electron plasma in the presence of a very strong axial magnetic field. Electron crossover effects are neglected. The generation of harmonics and the mixing of two signals occur within the valid range of signal levels for this analysis. Specific computer results are presented and discussed. An experimental study program for harmonic generation and coupling schemes in beam-plasma systems is outlined. The device consists of a xenon plasma generated by two hot-cathode Penning discharges and an electron beam that can be modulated and demodulated via short helix-type slow-wave structures. This method of coupling is compared with elliptic cavity couplers placed directly around the plasma column. Interactions in one-dimensional, spatially nonuniform beam-plasma systems are analyzed using the coupled-mode approach. The analysis applies to both the Penning ion gauge plasma and the gas discharge plasma. Some closed-form solutions as well as computer results are shown. A general nonlinear theory of beam-plasma systems is developed using a Lagrangian approach. The theory may also be used to investigate two-stream systems. The computer solution of the equations is outlined. (Author).
Book Synopsis Technical Abstract Bulletin by : Defense Documentation Center (U.S.)
Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1967 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government-wide Index to Federal Research & Development Reports by :
Download or read book Government-wide Index to Federal Research & Development Reports written by and published by . This book was released on 1967 with total page 1352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 902 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research Reports by :
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1964 with total page 1310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research Reports by :
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1964 with total page 1586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Microwave Generation Utilizing Double-stream Instabilities in Anisotropic Media by : L. D. Buchmiller
Download or read book Study of Microwave Generation Utilizing Double-stream Instabilities in Anisotropic Media written by L. D. Buchmiller and published by . This book was released on 1967 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes the theoretical and experimental investigation of the two-stream instability in bismuth, pyrolytic graphite, germanium, and silicon, as possible sources of radiation in the submillimeter to far infrared regions. The theory for the semimetals, Bi and PG, is concerned with the two-stream interaction of electrons and holes moving in opposite directions under the influence of an applied electric field. The theory for the anisotropic semiconductors, Ge and Si, considers the two-stream interaction of light and heavy electrons moving in the same direction. The band structure of these materials were incorporated into the plasma dispersion relations. The carrier velocity distributions were included by the use of the Boltzmann transport equation. The dispersion relations were numerically evaluated on a digital computer for the growth rate and the frequency of the instability for waves propagating in the principal crystalline directions. The results obtained by the present investigation clearly show that the details of band structure play a fundamental role in determining the character of two-stream instability in anisotropic solids. (Author).
Book Synopsis U. S. Government Research and Development Reports by :
Download or read book U. S. Government Research and Development Reports written by and published by . This book was released on 1965 with total page 1776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography of Scientific and Industrial Reports by :
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1965-07 with total page 1698 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research & Development Reports by :
Download or read book U.S. Government Research & Development Reports written by and published by . This book was released on 1967 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of the Possible Uses of Plasma for Millimeter Wave Generation by : Robert E. McIntosh
Download or read book A Study of the Possible Uses of Plasma for Millimeter Wave Generation written by Robert E. McIntosh and published by . This book was released on 1968 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Summary of Papers - Conference on Carbon by :
Download or read book Summary of Papers - Conference on Carbon written by and published by . This book was released on 1969 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Force Research Resumés written by and published by . This book was released on with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography of Scientific and Industrial Reports by :
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1969-03 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Microwave Generation Using Double-stream Instabilities in Anisotropic Media by : L. D. Buchmiller
Download or read book Study of Microwave Generation Using Double-stream Instabilities in Anisotropic Media written by L. D. Buchmiller and published by . This book was released on 1967 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Momentum relaxation times for hot electrons in individual valleys in germanium were calculated by extending the theory of Reik and Risken. The net growth rate was calculated for two-stream instability at 77 K for an applied electric field of 1000 V/cm. The damping of the plasma wave due to collisions of hot carriers in the valleys -2- through -4-, which provide shielding for the slow electrons in the first valley, is appreciable but damping due to collision of slow electrons is even more serious. Reducing the lattice temperature to 4 K will not improve the situation much, and increasing the doping to raise the plasma frequency does not appear to sufficiently overcome the collisional damping, at least within the doping range for which the present theory is valid (less than 10 to the 18th power/cc). The InSb photoconductive submillimeter wave detector was improved by the use of high purity InSb. Improved bismuth sample holders eliminated the cleavage of trigonal direction bismuth samples due to thermal stresses. However, the drift velocities obtainable are still only marginally sufficient to produce two-stream instabilities before heating and melting of the sample occurs. Experiments to observe the instabilities with an InSb detection system having a sensitivity of approximately minus 40 dbm were unsuccessful. (Author).
