Klystrons, Traveling Wave Tubes, Magnetrons, Cross-Field Amplifiers, and Gyrotrons (Artech House Microwave
Microwave tubes are vacuum electron devices used for the generation and amplification of radio frequencies in the microwave range. An established technology area, the use of tubes remains essential in the field today for high-power applications. The culmination of the author's 50 years of industry experience, this authoritative resource offers you a thorough understanding of the operations and major classes of microwave tubes. Minimizing the use of advanced mathematics, the book places emphasis on clear qualitative explanations of phenomena. This practical reference serves as an excellent introduction for newcomers to the field and offers established tube engineers a comprehensive refresher. Professionals find coverage of all major tube classifications, including klystrons, traveling wave tubes (TWTs), magnetrons, cross field amplifiers, and gyrotrons.
- Brand: Artech House Publishers
- ASIN: 1608071847
Principles of Traveling Wave Tubes (Artech House Radar
Offers detailed discussions of operating principles of helix and coupled-cavity traveling wave tubes, descriptions of RF interactions of electrons with electric fields, and the basic theories of electron bunching and traveling wave interactions.
- Color: Other
- ASIN: 0890067201
Principles of Klystrons, Traveling Wave Tubes, Magnetrons, Cross-Field Ampliers, and Gyrotrons: 1 (Artech House Microwave Library) by A.S. Gilmour
Will be shipped from US. Used books may not include companion materials, may have some shelf wear, may contain highlighting/notes, may not include CDs or access codes. 100% money back guarantee.
- ASIN: B0092J2YAY
- UPC: 884299079400
Millimeter-Wave Gyrotron Traveling-Wave Tube
A gyrotron traveling-wave amplifier (gyro-TWT) with the high-power and broad-band capabilities is considered as a turn-on key for next generation high-resolution radar. The book presents the most advanced theory, methods and physics in a gyro-TWT. The most challenging problem of instability competition has been for the first time addressed in a focused and systematic way and reported via concise states and vivid pictures. The book is likely to meet the interest of researchers and engineers in radar and microwave technology, who would like to study the gyro-TWTs and to promote its application in millimeter-wave radars.Chao-Hai Du and Pu-Kun Liu are both professors at Peking University.
- ASIN: 3642547273
Traveling-wave tubes (The Bell Telephone Laboratories
A book describing early experiments with travelling wave tubes done by Bell Laboratories.
- ASIN: B0007DL7AC
Analytical and experimental performance of a dual-mode traveling wave tube and multistage depressed
A computational procedure for the design of traveling-wave-tube(TWT)/refocuser/multistage depressed collector (MDC) systems was used to design a short, permanent-magnet refocusing system and a highly efficient MDC for a medium-power, dual-mode, 4.8- to 9.6-GHz TWT. The computations were carried out with advanced, multidimensional computer programs which model the electron beam and follow the trajectories of representative charges from the radiofrequency (RF) input of the TWT, through the slow-wave structure and refocusing section, to their points of impact in the depressed collector. Secondary emission losses in the MDC were treated semiquantitatively by injecting representative secondary-electron-emission current into the MDA analysis at the point of impact of each primary beam. A comparison of computed and measured TWT and MDC performance showed very good agreement. The electrodes of the MDC were fabricated from a particluar form of isptropic graphite that was selected for its low secondary electron yield, ease of machinability, and vacuum properties. Ramins, Peter and Force, Dale A. and Kosmahl, Henry G. Glenn Research Center NASA-TP-2752, E-3470, NAS 1.60:2752 RTOP 506-44-21 ACCUMULATORS; ELECTRON BEAMS; TRAVELING WAVE TUBES; COMPUTER AIDED DESIGN; ELECTRODES; GRAPHITE; LOSSE...
- ASIN: B07T4KV7RK
Computer modeling of multiple-channel input signals and intermodulation losses caused by nonlinear traveling wave tube
The multiple channel input signal to a soft limiter amplifier as a traveling wave tube is represented as a finite, linear sum of Gaussian functions in the frequency domain. Linear regression is used to fit the channel shapes to a least squares residual error. Distortions in output signal, namely intermodulation products, are produced by the nonlinear gain characteristic of the amplifier and constitute the principal noise analyzed in this study. The signal to noise ratios are calculated for various input powers from saturation to 10 dB below saturation for two specific distributions of channels. A criterion for the truncation of the series expansion of the nonlinear transfer characteristic is given. It is found that he signal to noise ratios are very sensitive to the coefficients used in this expansion. Improper or incorrect truncation of the series leads to ambiguous results in the signal to noise ratios. Stankiewicz, N. Glenn Research Center NASA-TP-1999, E-722, NAS 1.60:1999 RTOP 541-02-12 INTERMODULATION; MATHEMATICAL MODELS; SIGNAL DISTORTION; TRAVELING WAVE TUBES; APPROXIMATION; COMPUTERIZED SIMULATION; GAUSS EQUATION; NONLINEAR SYSTEMS; SIGNAL TO NOISE RATIOS; SOUND AMPLIFICATION
- ASIN: B07SS7GVGM
The 2020-2025 World Outlook for Manufacturing Electron Tubes and Parts, Cathode Ray Tubes, Picture Tubes, Klystron Tubes, Magnetron Tubes, and Traveling Wave Tubes Excluding Glass
This study covers the world outlook for manufacturing electron tubes and parts, cathode ray tubes, picture tubes, klystron tubes, magnetron tubes, and traveling wave tubes excluding glass blanks across more than 190 countries. For each year reported, estimates are given for the latent demand, or potential industry earnings (P.I.E.), for the country in question (in millions of U.S. dollars), the percent share the country is of the region, and of the globe. These comparative benchmarks allow the reader to quickly gauge a country vis-à-vis others. Using econometric models which project fundamental economic dynamics within each country and across countries, latent demand estimates are created. This report does not discuss the specific players in the market serving the latent demand, nor specific details at the product level. The study also does not consider short-term cyclicalities that might affect realized sales. The study, therefore, is strategic in nature, taking an aggregate and long-run view, irrespective of the players or products involved. This study does not report actual sales data (which are simply unavailable, in a comparable or consistent manner in virtually all of the countries of the world). This study gives, however, my estimates for the worldwide latent demand, or t...
- ASIN: B07NB8XR73
Excitation of the Traveling Wave
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
- ASIN: 1378992547
Coupled-Resonator Slow-Wave Structures for Traveling-Wave Tubes: An
TWT amplifiers remain the microwave power amplifiers of choice for high power microwave and mm-wave systems for land and aerospace applications. This book aims at advancing the present technology of TWTs with coupled resonator SWSs by enhanced analytical (quasi-TEM and equivalent circuit analysis) and field analysis codes, improved modeling, simulation and experimentation. Using these techniques, new variants of coupled resonator SWSs like ladder-core inverted slot mode SWS and the inductively loaded interdigital SWS have been investigated. The possibility of achieving both coalesced mode design that gives wide bandwidth and multibeam design that improves the peak power and gain is presented. An improved modeling and simulation technique using 3D electromagnetic codes has been proposed. A field analysis model for corrugated waveguide SWS, based on Coupled Integral Equation Technique (CIET), which is a combination of Mode Matching Technique (MMT) and Method of Moments is presented. The analysis will be very useful, especially to microwave engineers aiming to improve the TWT design for higher levels in power, efficiency and bandwidth.
- ASIN: 3838327888
Analytical prediction and experimental verification of performance at various operating conditions of a dual-mode traveling wave tube with multistage depressed
A comparison of analytical and experimental results is presented for a high performance dual-mode traveling wave tube (TWT) operated over a wide range conditions. The computations are carried out with advanced multidimensional computer programs. These programs model the electron beam as a series of disks or rings of charge and follow their trajectories from the rf input of the TWT through the slow-wave structure refocusing system to their points of impacts in the depressed collector. TWT performance, collector efficiency, and collector current distribution are computed and compared with measurements. Very good agreement was obtained between computed and measured TWT performance and collector efficiencies, and the computer design of a highly efficient collector was demonstrated. Dayton, J. A., Jr. and Kosmahl, H. G. and Ramins, P. and Stankiewicz, N. Glenn Research Center NASA-TP-1831, E-577 ELECTRON BEAMS; RADIO FREQUENCY DISCHARGE; TRAVELING WAVE TUBES; COMPUTERIZED SIMULATION; ELECTRON TRAJECTORIES
- ASIN: B07SD26WG8
Efficiency enhancement of octave-bandwidth traveling wave tubes by use of multistage depressed
Small, three- and five-stage depressed collectors were evaluated in conjunction with a 4.8- to 9.6-GHz TWT of 325- to 675-W power output and a beam of 0.5 microperv. The multistage depressed collector (MDC) performed well even though its design had been optimized for a TWT of identical design but considerably less output power. Despite large, fixed losses significant efficiency enhancement was demonstrated with both the three- and five-stage depressed collectors. At saturated rf power output, the improvement in the overall efficiency ranged from a factor of 2.5 to 3.0 for the three-stage collector and a factor of 3.0 to 3.5 for the five-stage collector. At saturation three-stage collector efficiencies of 77 to 80 percent and five-stage collector efficiencies of 81 to 84 percent were obtained across the frequency band. An overall efficiency of 37.0 to 44.3 percent across the frequency band of 4.8 to 9.6 GHz was demonstrated with the use of harmonic injection. For operation below saturation, even larger relative improvements in the overall TWT efficiency were demonstrated. Collector performance was relatively insensitive to the degree of regulation of the collector power supply. Ramins, P. and Fox, T. A. Glenn Research Center NASA-TP-1416, E-9749 RTOP 506-20 ACCUMULATORS; ELECTRON ...
- ASIN: B07S98G7KJ
Analytical prediction with multidimensional computer programs and experimental verification of the performance, at a variety of operating conditions, of ... traveling wave tubes with depressed
Experimental and analytical results are compared for two high performance, octave bandwidth TWT's that use depressed collectors (MDC's) to improve the efficiency. The computations were carried out with advanced, multidimensional computer programs that are described here in detail. These programs model the electron beam as a series of either disks or rings of charge and follow their multidimensional trajectories from the RF input of the ideal TWT, through the slow wave structure, through the magnetic refocusing system, to their points of impact in the depressed collector. Traveling wave tube performance, collector efficiency, and collector current distribution were computed and the results compared with measurements for a number of TWT-MDC systems. Power conservation and correct accounting of TWT and collector losses were observed. For the TWT's operating at saturation, very good agreement was obtained between the computed and measured collector efficiencies. For a TWT operating 3 and 6 dB below saturation, excellent agreement between computed and measured collector efficiencies was obtained in some cases but only fair agreement in others. However, deviations can largely be explained by small differences in the computed and actual spent beam energy distributions. The analytical to...
- ASIN: B07S7737L2
Efficiency enhancement of dual-mode traveling wave tubes at saturation and in the linear range by use of spent-beam refocusing and multistage depressed
An axisymmetric, multistage depressed collector of fixed geometric design was evaluated in conjunction with an octave-bandwidth, dual-mode TWT. The TWT was operated over a wide range of conditions to simulate different applications. The collector was operated in three-, four-, and five-stage configurations, and its performance was optimized (within the constraint of fixed geometric design) over the range of TWT operating conditions covered. For operation of the dual-mode TWT at and near saturation, the collectors increased the TWT overall efficiency by a factor of 2 1/2 to 3 1/2. Collector performance was relatively constant for both the high and low TWT modes and for operation of the TWT across an octave bandwidth. For operation of the TWT in the linear, low-distortion range, collector efficiencies of 90 percent and greater were obtained, leading to a five- to twelvefold increase in the TWT overall efficiency for the range of operating conditions covered and reasonably high (greater than 25 percent) overall efficiencies well below saturation. Ramins, P. and Fox, T. A. Glenn Research Center NASA-TP-1486, E-9912 RTOP 506-20 ACCUMULATORS; FOCUSING; TRAVELING WAVE TUBES; BEAM WAVEGUIDES; EFFICIENCY; GRAPHS (CHARTS); LINEARITY; MODES; SATURATION; TABLES (DATA)
- ASIN: B07RZWQBNB
Users' manual for computer program for one-dimensional analysis of coupled-cavity traveling wave
The use of the coupled cavity traveling wave tube for space communications has led to an increased interest in improving the efficiency of the basic interaction process in these devices through velocity resynchronization and other methods. To analyze these methods, a flexible, large signal computer program for use on the IBM 360/67 time-sharing system has been developed. The present report is a users' manual for this program. Omalley, T. A. and Connolly, D. J. Glenn Research Center NASA-TM-X-3565, E-8900 RTOP 506-20 28338 SUBROUTINES; TRAVELING WAVE TUBES; USER MANUALS (COMPUTER PROGRAMS); COMPUTER PROGRAMS; COMPUTERIZED SIMULATION; ELECTRON TRAJECTORIES
- ASIN: B07RTQXNBD
Computer program for analysis of coupled-cavity traveling wave
A flexible, accurate, large signal computer program was developed for the design of coupled cavity traveling wave tubes. The program is written in FORTRAN IV for an IBM 360/67 time sharing system. The beam is described by a disk model and the slow wave structure by a sequence of cavities, or cells. The computational approach is arranged so that each cavity may have geometrical or electrical parameters different from those of its neighbors. This allows the program user to simulate a tube of almost arbitrary complexity. Input and output couplers, severs, complicated velocity tapers, and other features peculiar to one or a few cavities may be modeled by a correct choice of input data. The beam-wave interaction is handled by an approach in which the radio frequency fields are expanded in solutions to the transverse magnetic wave equation. All significant space harmonics are retained. The program was used to perform a design study of the traveling-wave tube developed for the Communications Technology Satellite. Good agreement was obtained between the predictions of the program and the measured performance of the flight tube. Connolly, D. J. and Omalley, T. A. Glenn Research Center NASA-TN-D-8492, E-8839 RTOP 506-20 28246 COMPUTER PROGRAMS; DESIGN ANALYSIS; TRAVELING WAVE TUBES; COMPUT...
- ASIN: B07RNFPC96
Three-Dimensional Simulation of Traveling-Wave Tube Cold-Test Characteristics Using CST MICROWAVE
The electromagnetic field simulation software package CST MICROWAVE STUDIO (MWS) was used to compute the cold-test parameters - frequency-phase dispersion, on-axis impedance, and attenuation - for a traveling-wave tube (TWT) slow-wave circuit. The results were compared to experimental data, as well as to results from MAFIA, another three-dimensional simulation code from CST currently used at the NASA Glenn Research Center (GRC). The strong agreement between cold-test parameters simulated with MWS and those measured experimentally demonstrates the potential of this code to reduce the time and cost of TWT development. Chevalier, Christine T. and Herrmann, Kimberly A. and Kory, Carol L. and Wilson, Jeffrey D. and Cross, Andrew W. and Santana , Samuel Glenn Research Center NASA/TM-2003-212486, NAS 1.15:212486, E-14028…
- ASIN: 1724122711
Ferruleless coupled-cavity traveling-wave tube cold-test characteristics simulated with
The three-dimensional, electromagnetic circuit analysis code, Micro-SOS, can be used to reduce expensive and time consuming experimental 'cold-testing' of traveling-wave tube (TWT) circuits. The frequency-phase dispersion and beam interaction impedance characteristics of a ferruleless coupled-cavity traveling-wave tube slow-wave circuit were simulated using the code. Computer results agree closely with experimental data. Variations in the cavity geometry dimensions of period length and gap-to-period ratio were modeled. These variations can be used in velocity taper designs to reduce the radiofrequency (RF) phase velocity in synchronism with the decelerating electron beam. Such circuit designs can result in enhanced TWT power and efficiency. Schroeder, Dana L. and Wilson, Jeffrey D. Glenn Research Center NASA-TP-3306, E-7411, NAS 1.60:3306 …
- ASIN: 1792719094
Traveling-Wave Tube Amplifier Second Harmonic as Millimeter-Wave Beacon Source for Atmospheric Propagation
This paper presents the design and test results of a CW millimeter-wave satellite beacon source, based on the second harmonic from a traveling-wave tube amplifier and utilizes a novel waveguide multimode directional coupler. A potential application of the beacon source is for investigating the atmospheric effects on Q-band (37 to 42 GHz) and V/W-band (71 to 76 GHz) satellite-to-ground signals. Simons, Rainee N. and Wintucky, Edwin G. Glenn Research Center NASA/TM-2014-218121, E-18863
- ASIN: 1794409769
Low-current traveling wave tube for use in the microwave power
The results of a traveling-wave-tube/multistage depressed-collector (TWT-MDC) design study in support of the Advanced Research Projects Agency/Department of Defense (ARPA/DOD) Microwave Power Module (MPM) Program are described. The study stressed the possible application of dynamic and other tapers to the RF output circuit of the MPM traveling wave tube as a means of increasing the RF and overall efficiencies and reducing the required beam current (perveance). The results indicate that a highly efficient, modified dynamic velocity taper (DVT) circuit can be designed for the broadband MPM application. The combination of reduced cathode current (lower perveance) and increased RF efficiency leads to (1) a substantially higher overall efficiency and reduction in the prime power to the MPM, and (2) substantially reduced levels of MDC and MPM heat dissipation, which simplify the cooling problems. However, the selected TWT circuit parameters need to be validated by cold test measurements on actual circuits. Palmer, Raymond W. and Ramins, Peter and Force, Dale A. and Dayton, James A. and Ebihara, Ben T. and Gruber, Robert P. Glenn Research Center NASA-TP-3344, E-7329, NAS 1.60:3344 RTOP 506-72-00…
- ASIN: 1792844727
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