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Theory And Design Study Of A Novel Quasi Optical Gyrotron Traveling Wave Amplifier
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Book Synopsis Theory and Design Study of a Novel Quasi-optical Gyrotron Traveling Wave Amplifier by : Jagadishwar Rao Sirigiri
Download or read book Theory and Design Study of a Novel Quasi-optical Gyrotron Traveling Wave Amplifier written by Jagadishwar Rao Sirigiri and published by . This book was released on 2000 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 2014-05-29 with total page 200 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 A Novel Quasioptical Gyrotron Traveling Wave Amplifier by : Jagadishwar Rao Sirigiri
Download or read book A Novel Quasioptical Gyrotron Traveling Wave Amplifier written by Jagadishwar Rao Sirigiri and published by . This book was released on 2002 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) A gyrotron oscillator experiment with an overmoded open confocal resonator was also run at a peak power of up to 83 kW at 136 GHz with an efficiency of 16%. The gyrotron oscillator experiment had excellent mode stability which makes an oversized quasioptical open confocal resonator a candidate for use in high frequency millimeter and sub-millimeter wave gyrotrons. A second harmonic confocal gyrotron experiment was also tried at 280 GHz but the poor quality electron beam prevented the generation of the second harmonic, however, the stronger fundamental mode interaction was suppressed thus validating the advantages of using confocal resonators in high harmonic gyrotrons to suppress the stronger fundamental interaction. The experiments on three millimeter wave VEDs with two novel kinds of highly oversized interaction structures described in this work have demonstrated a novel technique for building high power (> 1 kW) high frequency (> 100 GHz) VEDs.
Book Synopsis Theory of Gyrotron Traveling Wave Amplifiers at Harmonics of the Gyration Frequency by : Qiangfa Li
Download or read book Theory of Gyrotron Traveling Wave Amplifiers at Harmonics of the Gyration Frequency written by Qiangfa Li and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory and Single Wave Simulation of the Gyrotron Traveling Wave Amplifier Operating at Cyclotron Harmonics by : K. R. Chu
Download or read book Theory and Single Wave Simulation of the Gyrotron Traveling Wave Amplifier Operating at Cyclotron Harmonics written by K. R. Chu and published by . This book was released on 1978 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cyclotron maser interaction in a waveguide structure at the harmonics of the cyclotron frequencies has been studied in detail both analytically and with numerical simulations. An idealized cold beam, single wave model has been assumed and investigated using the relativistic Vlasov and Maxwell equations. Analytical scaling relations for the growth rate and efficiency have been derived and extensive simulation data obtained. Emphasis has been placed on methods of parameter optimization for maximizing beam to wave energy conversion efficiency. Beam frame efficiencies in the vicinity of 20% and 10% have been found for the third and fourth cyclotron harmonics, respectively. These results are capable of yielding preliminary design data for gyrotron traveling wave amplifiers. However, it should be noted that a number of important practical problems such as competition between spurious modes have not been considered in the context of the present single wave analysis. Furthermore, requirements on magnetic field uniformity and electron thermal spread become more stringent as cyclotron harmonic number increases and thus the realization of suitable experimental conditions may be expected to become increasingly difficult. (Author).
Author :Machavaram V. Kartikeyan Publisher :Springer Science & Business Media ISBN 13 :9783540402008 Total Pages :248 pages Book Rating :4.4/5 (2 download)
Book Synopsis Gyrotrons by : Machavaram V. Kartikeyan
Download or read book Gyrotrons written by Machavaram V. Kartikeyan and published by Springer Science & Business Media. This book was released on 2003-11-17 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis A Novel Wideband 140 GHz Gyrotron Amplifier by : Colin D. Joye
Download or read book A Novel Wideband 140 GHz Gyrotron Amplifier written by Colin D. Joye and published by . This book was released on 2008 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theory, design and experimental results of a wideband 140 GHz, 1 kW pulsed gyro-traveling wave amplifier are presented. The gyro- TWA operates in the HE(0,6) mode of a novel cylindrical confocal waveguide using a gyrating electron beam. The electromagnetic theory, interaction theory, design processes and experimental procedures have been described in detail. The experiment has produced over 820 W peak power, 34 dB linear gain, and a -3 dB bandwidth of over 1.5 GHz (1.1%) from a 37 kV, 2.7 A electron beam having a beam pitch factor of 0.6, radius of 1.9 mm and calculated perpendicular momentum spread of approximately 9%. The gyro-amplifier was nominally operated at a pulse length of 2 microseconds, but was tested to amplify pulses as short as 4 nanoseconds with no noticeable pulse broadening. Internal reflections in the amplifier were identified using these short pulses by time-domain reflectometry. A novel internal mode converter was designed for this device that transforms the confocal HE(0,6) fields into a fundamental Gaussian beam for ultra-low loss transmission of the millimeter wave output power through a corrugated transmission line. The demonstrated performance of this amplifier shows that it can be applied to Dynamic Nuclear Polarization (DNP) and Electron Paramagnetic Resonance (EPR) spectroscopy.
Download or read book Smith, Dan written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analytical and Numerical Modeling of Gyrotrons by : D. Dialetis
Download or read book Analytical and Numerical Modeling of Gyrotrons written by D. Dialetis and published by . This book was released on 1984 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the final report on work performed during the period 21 May 1980 through 20 July 1984. It describes the research activities of SAI personnel in support of the experimental and theoretical gyrotron development program at the Naval Research Laboratory. SAI conducted theoretical work consisting of analytical and numerical modeling of high power gyrotron radiation devices. The research effort has been focused on: Wideband amplifier design and theory; Megawatt oscillator design and theory; Quasi-optical resonator theory; and RF heating and current drive in a plasma.
Book Synopsis A Gyrotron-Traveling-Wave Tube Amplifier Experiment with a Ceramic Loaded Interaction Region by :
Download or read book A Gyrotron-Traveling-Wave Tube Amplifier Experiment with a Ceramic Loaded Interaction Region written by and published by . This book was released on 2002 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design and experimental study of a 35-GHz gyrotron-traveling-wave tube (gyro-TWT) amplifier operating in the circular TE01 mode at the fundamental cyclotron harmonic are presented. The interaction circuit in this experiment consisted of a new type of ceramic loading that provided the required loss for stable operation. A saturated peak power of 137 kW was measured at 34.1 GHz, corresponding to a saturated gain of 47.0 dB and an efficiency of 17%, with a -3-dB bandwidth of 1.11 GHz (3.3%). Peak output powers in the range of 102.1 to 148.6kW with -3-dB bandwidths of 1.26 and 0.94 GHz, respectively, were measured by varying the operating parameters. The gyro-TWT was found to be zero-drive stable at these operating points, demonstrating that ceramic loading is a highly effective means of suppressing spurious oscillations in gyro-TWTs. This type of ceramic loading has the added advantage of being compatible with high average power operation.
Book Synopsis Wide Band Gyrotron Traveling Wave Amplifier Analysis by : A. Rekiouak
Download or read book Wide Band Gyrotron Traveling Wave Amplifier Analysis written by A. Rekiouak and published by . This book was released on 1987 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Linear and non-linear analyses on a gyrotron amplifier with a periodically disc-loaded cylindrical waveguide circuit are performed. The dispersion relation of the circuit allows for wideband interaction with a relativistic beam of moderate power (Vb = 60kV, Ib = 5A). Linear analysis of the interaction with the fundamental mode shows a gain of the order of 50-60dB/m over a bandwidth larger than 22% and a linear phase versus frequency characteristic. Non linear analysis predicts the following saturation characteristics: a 48kW peak output power at 5.3GHz with 16% efficiency. The saturation length of the tube is about 37cm. These results show that this device is competitive with conventional high power traveling wave devices in performance, and, being simpler in structure, also in cost.
Book Synopsis A 250 GHz Photonic Band Gap Gyrotron Amplifier by : Emilio Alessandro Nanni
Download or read book A 250 GHz Photonic Band Gap Gyrotron Amplifier written by Emilio Alessandro Nanni and published by . This book was released on 2013 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports the theoretical and experimental investigation of a novel gyrotron traveling-wave-tube (TWT) amplifier at 250 GHz. The gyrotron amplifier designed and tested in this thesis has achieved a peak small signal gain of 38 dB at 247.7 GHz, with a 32 kV, 0.35 A electron beam and a 8.9 T magnetic field. The instantaneous -3 dB bandwidth of the amplifier at peak gain is 0.4 GHz. A peak output power of 45 W has been measured. The output power is not saturated but is limited by the 7.5 mW of available input power. The amplifier can be tuned for operation from 245- 256 GHz. With a gain of 24 dB and centered at 253.25 GHz the widest instantaneous -3 dB bandwidth of 4.5 GHz was observed for a 19 kV, 0.305 A electron beam. To achieve stable operation at these high frequencies, the amplifier uses a novel photonic band gap (PBG) interaction circuit. The PBG interaction circuit confines the TE03-like mode which couples strongly to the electron beam. The PBG circuit provides stability from oscillations by supporting the propagation of TE modes in a narrow range of frequencies, allowing for the confinement of the operating TE03-like mode while rejecting the excitation of oscillations at lower frequencies. Experimental results taken over a wide range of parameters, 15-30 kV and 0.25-0.5 A, show good agreement with a theoretical model. The theoretical model incorporates cold test measurements for the transmission line, input coupler, PBG waveguide and mode converter. This experiment achieved the highest frequency of operation (250 GHz) for a gyrotron amplifier. At present, there are no other amplifiers in this frequency range that are capable of producing either high gain or high-output power. With 38 dB of gain and 45 W this is also the highest gain observed above 94 GHz and the highest output power achieved above 140 GHz by any conventional-voltage vacuum electron device based amplifier. The output power, output beam pattern, instantaneous bandwidth, spectral purity and shot-to-shot stability of the amplified pulse meet the basic requirements for the implementation of this device on a pulsed dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) spectrometer.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1996 with total page 1012 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Traveling-wave Optical Parametric Amplifier by : Sang-Kyung Choi
Download or read book Traveling-wave Optical Parametric Amplifier written by Sang-Kyung Choi and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The gain response of the traveling-wave OPA is further investigated experimentally, in both the phase-sensitive and phase-insensitive configurations. The theory is refined to a higher order of accuracy and extended to cover both the spatial and the temporal profiles of the pulses. Good agreement is obtained between theory and experiment.
Book Synopsis Theoretical Analysis of the Solid-state Transverse Traveling Wave Amplifier by : John W. Jackson
Download or read book Theoretical Analysis of the Solid-state Transverse Traveling Wave Amplifier written by John W. Jackson and published by . This book was released on 1980 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Research on Gyrotrons by : J. L. Hirshfield
Download or read book Research on Gyrotrons written by J. L. Hirshfield and published by . This book was released on 1985 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: A summary is given of research on gyrotron-like mechanisms for anplifying or generating electromagnetic radiation. These mechanisms include slow-wave cyclotron-wave amplification in a dielectrically-loaded waveguide, cyclotron harmonic oscillations in a quasi-optical millimeter-wave structure, a quasi-optical gyro-klystron, and cyclotron, and cyclotron harmonic amplification in irregular cross section waveguides. Both linearized theory and experimental observations are described. Keywords include: Gyrotron, Cyclotron resonance, Microwave amplification, and Millimeterwave generation.
Book Synopsis A 94 Gigahertz Quasi-optical Traveling-wave Maser by : Lyle Oliver Hoppie
Download or read book A 94 Gigahertz Quasi-optical Traveling-wave Maser written by Lyle Oliver Hoppie and published by . This book was released on 1971 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
