Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
High Power Rf Amplifiers For Accelerator Applications The Large Orbit Gyrotron And The High Current Space Charge Enhanced Relativistic Klystron
Download High Power Rf Amplifiers For Accelerator Applications The Large Orbit Gyrotron And The High Current Space Charge Enhanced Relativistic Klystron full books in PDF, epub, and Kindle. Read online High Power Rf Amplifiers For Accelerator Applications The Large Orbit Gyrotron And The High Current Space Charge Enhanced Relativistic Klystron ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis High Power Rf Amplifiers for Accelerator Applications by :
Download or read book High Power Rf Amplifiers for Accelerator Applications written by and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Los Alamos is investigating a number of high power microwave sources for their potential to power advanced accelerators. Included in this investigation are the large orbit gyrotron amplifier and oscillator (LOG) and the relativistic klystron amplifier (RKA). LOG amplifier development is newly underway. Electron beam power levels of 3 GW, 70 ns duration, are planned, with anticipated conversion efficiencies into RF on the order of 20 percent. Ongoing investigations on this device include experimental improvement of the electron beam optics, and computational studies of resonator design and RF extraction. Recent RKA studies have operated at electron beam powers into the device of 1.35 GW in microsecond duration pulses. The device has yielded modulated electron beam power approaching 300 MW using 3--5 kW of RF input drive. RF powers extracted into waveguide have been up to 70 MW, suggesting that more power is available from the device that we have converted to-date in the extractor. We have examined several aspects of operation, including beam bunching phenomena and RF power extraction techniques. In addition, investigations of the amplifier gain as a function of input drive, electron beam parameters and axial magnetic field strength also have been explored. The effect of ions formed during device operation also has been considered.
Book Synopsis High Power RF Amplifiers for Accelerator Applications: The Large Orbit Gyrotron and the High Current, Space Charge Enhanced Relativistic Klystron by : R.M. Stringfield
Download or read book High Power RF Amplifiers for Accelerator Applications: The Large Orbit Gyrotron and the High Current, Space Charge Enhanced Relativistic Klystron written by R.M. Stringfield and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Relativistic Klystron Amplifiers Driven by Modulated Intense Relativistic Electron Beams by : Y. Y. Lau
Download or read book Relativistic Klystron Amplifiers Driven by Modulated Intense Relativistic Electron Beams written by Y. Y. Lau and published by . This book was released on 1990 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper, gives an overview of the novel relativistic klystron amplifiers which are driven by an annular intense relativistic electron beam (500 kV, 10 kA range) which is modulated by an external rf source (1.3 GHz, 100 kW range). Experiments, theory, simulation and simple models are presented to illustrate the unusual properties of such devices, which result from the intense space charge of the beam. Chief among them include electrostatic insulation against vacuum breakdown at high power levels, efficient current modulation, short bunching length, and amplitude and phase stability of the output signal. Many of these unexpected features were revealed in two separate experiments: one with the lower current beam (5 kA, 2 cm beam radius), and the other one with a higher current beam (16 kA, 6.6 cm beam radius). Three gigawatts or rf power at 1.3 GHz were generated with the large diameter beam at an efficiency of 35 percent with 37 dB gain. These experiments will be reviewed, along with a combination of particle simulation results and analytic models which facilitate the interpretation. Pay special attention to the unfamiliar features of these amplifiers, and shall address the critical issues which need to be solved before such amplifiers can fulfill their potential in a wide range of applications. Keywords: High power microwaves; Relativistic klystron amplifiers; Intense beam modulation. (JHD).
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1991 with total page 1654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1997 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrical & Electronics Abstracts by :
Download or read book Electrical & Electronics Abstracts written by and published by . This book was released on 1997 with total page 2240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory and Modeling of a Relativistic Klystron Amplifier with High Space Charge for Microsecond Applications by :
Download or read book Theory and Modeling of a Relativistic Klystron Amplifier with High Space Charge for Microsecond Applications written by and published by . This book was released on 1992 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: We discuss basic Relativistic Klystron Amplifier physics. We show that in the intense space-charge regime the maximum power extraction does not coincide with the maximum harmonic bunching. In addition, we show that as the beam is bunched, the additional power stored in the Coulomb fields does not add significantly to the overall power extraction. Because of these effects, the power extraction at 1.3 GHz for a 500 kV, 5 kA beam with reasonable beam-to-wall spacing is limited to around 35%. 3 refs., 17 figs.
Book Synopsis Advances in High-power Rf Amplifiers by :
Download or read book Advances in High-power Rf Amplifiers written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Several powerful accelerators and storage rings are being considered that will require tens or even hundreds of megawatts of continuous rf power. The economics of such large machines can be dictated by the cost and efficiency of the rf amplifiers. The overall design and performance of such narrow-band amplifiers, operating in the 50- to 1500-MHz region, are being theoretically studied as a function of frequency to determine the optimum rf amplifier output power, gain, efficiency, and dc power requirements. The state of the art for three types of amplifiers (gridded tubes, klystrons, and gyrocons) is considered and the development work necessary to improve each is discussed. The gyrocon is a new device, hence its various embodiments are discussed in detail. The Soviet designs are reviewed and the gyrocon's strengths and weaknesses are compared to other types of microwave amplifiers. The primary advantages of the gyrocon are the very large amount of power available from a single device and the excellent efficiency and stable operation. The klystron however, has much greater gain and is simpler mechanically. At very low frequencies, the small size of the gridded tube makes it the optimum choice for all but the most powerful systems.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1991 with total page 1162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis RF Power Amplifiers by : Marian K. Kazimierczuk
Download or read book RF Power Amplifiers written by Marian K. Kazimierczuk and published by John Wiley & Sons. This book was released on 2014-10-14 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition of the highly acclaimed RF Power Amplifiers has been thoroughly revised and expanded to reflect the latest challenges associated with power transmitters used in communications systems. With more rigorous treatment of many concepts, the new edition includes a unique combination of class-tested analysis and industry-proven design techniques. Radio frequency (RF) power amplifiers are the fundamental building blocks used in a vast variety of wireless communication circuits, radio and TV broadcasting transmitters, radars, wireless energy transfer, and industrial processes. Through a combination of theory and practice, RF Power Amplifiers, Second Edition provides a solid understanding of the key concepts, the principle of operation, synthesis, analysis, and design of RF power amplifiers. This extensive update boasts: up to date end of chapter summaries; review questions and problems; an expansion on key concepts; new examples related to real-world applications illustrating key concepts and brand new chapters covering ‘hot topics’ such as RF LC oscillators and dynamic power supplies. Carefully edited for superior readability, this work remains an essential reference for research & development staff and design engineers. Senior level undergraduate and graduate electrical engineering students will also find it an invaluable resource with its practical examples & summaries, review questions and end of chapter problems. Key features: • A fully revised solutions manual is now hosted on a companion website alongside new simulations. • Extended treatment of a broad range of topologies of RF power amplifiers. • In-depth treatment of state-of-the art of modern transmitters and a new chapter on oscillators. • Includes problem-solving methodology, step-by-step derivations and closed-form design equations with illustrations.
Book Synopsis High Energy Density and High Power RF by : Steven H. Gold
Download or read book High Energy Density and High Power RF written by Steven H. Gold and published by American Institute of Physics. This book was released on 2003-12-04 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the sixth in a series of international workshops on high-power and high-energy density microwave devices for accelerator, plasma physics, and defense applications. Past workshops were held in Dubna, Montauk, Hayama, Pajaro Dunes, and Snowbird. The theme is research and development of techniques to increase microwave energy density and peak power in active and passive microwave devices and components ranging from L-band to W-band. The scope of this workshop has now been broadened to include radar and high power microwave (HPM) systems, space exploration, neutron sources, and even plasma heating and current drive in controlled thermonuclear fusion research.
Book Synopsis High-current Relativistic Klystron Amplifier Development for Microsecond Pulse Lengths by :
Download or read book High-current Relativistic Klystron Amplifier Development for Microsecond Pulse Lengths written by and published by . This book was released on 1991 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Los Alamos is extending the performance of the Friedman-type, high-current relativistic klystron amplifier (RKA) to the microsecond regime while attempting to achieve the gigawatt-level peak power capability that has been characteristic of the RKA at shorter pulse lengths. Currently the electron beam power into the device is about 1 GW in microsecond duration pulses, with an effort underway to increase the beam power to 2.5 GW. To date the device has yielded an rf modulated electron beam power of 350 MW, with up to 50 MW coupled into waveguide. Several aspects of RKA operation under investigation that affect RKA beam bunching efficiency and amplifier gain include cavity tuning, beam diameter, beam current, and input rf drive power, and the development of an output coupler that efficiently couples the microwave power from the low impedance beam into rectangular waveguide operating in the dominant mode. Current results from experimental testing and code modelling are presented. 5 refs., 5 figs.
Download or read book On the Horizon written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past, linear accelerators at frequencies below 3 GHz have been driven by klystrons or gridded tubes, with most of the small electron accelerators using conventional magnetrons. During the past few years, there have been several new rf amplifier developments that could be advantageous to the linear accelerator designer. Among these new devices are the cathode-driven crossed-field amplifier, Klystrode, high-power solid-state amplifier, lasertron, multiple-beam klystron, phase-locked magnetron, and a depressed collector for a high-power klystron. All of these devices are being worked on at this time. Each can contribute to a linear accelerator system by supplying better efficiency, lower cost, higher power, or longer life. This paper will review the present status of each device and, where current test data are available, they will be reviewed. 19 refs., 13 figs.
Book Synopsis A Highly Efficient And Linear RF Power Amplifier For Mobile Terminal Applications by : Alireza Kheirkhahi
Download or read book A Highly Efficient And Linear RF Power Amplifier For Mobile Terminal Applications written by Alireza Kheirkhahi and published by . This book was released on 2013 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The radio frequency (RF) power amplifier (PA) is the last block in a transmitter chain. It amplifies the signal to the target power and drives the antenna. The power amplifier consumes the largest portion of the transmitter current consumption budget, and any power saving in this block will significantly improve the overall system efficiency. This is especially critical in battery-operated portable wireless communication systems such as cellular phones, PDA's and laptops. There is a trade-off between efficiency and linearity in power amplifiers. Non-switching power amplifiers efficiency increases as the output power increases, but so does the amplifier distortion. This is more problematic in modern wireless communication systems, where spectrally efficient and high data rate modulations are used and the linearity requirement is hard to meet. The two common approaches of backing-off the output power and adding a linearization scheme have their own challenges. The first one results in efficiency loss and the second one adds to the system complexity and has design challenges for wideband applications. The design of highly efficient and linear RF power amplifiers has been the subject of several studies. Different techniques have been proposed to overcome the challenge. Dynamic control of the power amplifier quiescent current, dynamic control of the load impedance, output harmonic control and dynamic supply voltage control (envelope tracking) are the popular proposed techniques. Despite the fact that the envelope tracking technique has gained momentum as an attractive efficiency enhancement method for handset applications, its implementation still faces challenges. This technique needs a high efficiency envelope amplifier to achieve good overall efficiency. The design of a small, efficient and wideband envelope amplifier is very challenging. Usually these amplifiers require external components and if they are in the switching mode they can add disturbance to the rest of the system. This research focuses on a technique that overcomes this main challenge of the ET amplifier design and is organized as follows : Chapter 1 is the introduction and discusses the motivation of this research and some of the prior art. Chapter 2 explains the proposed technique to enhance the RF power amplifiers efficiency in high peak-to-average power ratio applications. This technique is based on controlling the baseband drain impedance by adding an envelope termination to the PA supply, and applying the baseband envelope signal to the input. As a result, the amplifier operates closer to its saturated region for all envelope amplitudes, and its efficiency is improved. A digital predistortion scheme is implemented to compensate for the linearity degradation of the proposed technique. A 1.95GHz HFET power amplifier exhibits an improvement in peak PAE from 40% to 56% for a two-tone input, from 33% to 42% for an uplink WCDMA with one dedicated physical data channel and from 27% to 32% for an uplink WCDMA with six dedicated physical data channels using the proposed technique. Chapter 3 shows some improvements to the proposed technique including adding envelope equalization. The envelope equalization also improves the amplifier linearity since it reduces the distortion from clipping the output signal due to non-ideal dynamic supply. The linearity of the implemented amplifier is studied in a large-signal fashion. This technique improves the maximum efficiency from 28% to 40% for an uplink WCDMA signal with six dedicated physical data channels and the maximum linear efficiency from 21% to 28%. Also, a scheme to vary the DC power supply with the average power to maintain high efficiency down to a low average power region is proposed. Chapter 4 studies envelope feedback systems stability. The stability criteria are derived based on the Lyapunov stability theorem for time-varying systems and the tool of linear matrix inequality (LMI). The effects of system parameters on the stability are investigated. The system is simulated in Simulink and implemented, and stability boundaries predicted by LMI are in good agreement with the simulation and measurement results. Chapter 5 concludes the dissertation and suggests some future work.
Book Synopsis Millimeter-Wave Gyrotron Traveling-Wave Tube Amplifiers by : Chao-Hai Du
Download or read book Millimeter-Wave Gyrotron Traveling-Wave Tube Amplifiers written by Chao-Hai Du and published by Springer. This book was released on 2014-06-05 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis L'Esprit des journaux... mars 1775 by :
Download or read book L'Esprit des journaux... mars 1775 written by and published by . This book was released on 1775 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
