German acronym liga to fabricate a coupled cavity travelingwave tube twt is presented. Pdf analysis of a coupledcavity slow wave structure for. The invention discloses a slowwave structure of a multiplebeam coupling cavity travelingwave tube and a manufacturing method of the slowwave structure. Because of the relative complexity associated with the fabrication of coupled cavity twts, the authors chose to explore other, geometrically simpler twt. Sep 06, 2019 the twt belongs to a category of linear beam tubes, such as the klystron, coupled cavity twt in which the radio wave interacts with the beam in a. A coupled cavity traveling wave tube comprising an electron gun for producing an electron beam, a collector electrode for receiving the electrons of an electron beam produced by said electron gun, and a slow wave structure positioned between said electron gun and said collector electrode through which said electron beam and a high frequency electromagnetic wave passes, said slow wave. Pdf novel coupledcavity twt structure using twostep liga. A onedimensional computer model for a coupled cavity travelingwave tube was developed at nasa in the 1970s refs. Analysis and optimization of performance of coupling structures of coupled cavity travelling wave tube cctwt that are used to feed and extract rf power. Pulsed products kaband, coupled cavity twts microwave. Aug 29, 2017 however, a magnetron is an oscillator and a cfa is an amplifier. However, the computer simulation of a cou pled cavity twt to analyze the electronwave interaction manuscript received march 18, 1988.
Owing to a ferruleless coupled cavity twt used phaseadjusted taper, the interaction efficiency has been increased from. Design of a novel high power vband helixfolded waveguide. Novel coupled cavity twt structure using twostep liga fabrication youngmin shin, gunsik park, glenn p. Us4315194a coupled cavity traveling wave tube with velocity. Twt amplifiers magnetron transmitters coupled cavity klystron grid cw amplifiers cavity oscillators amp cfa. Pdf in order to make millimeterwave sources practical, improved. Operation is similar to that of a klystron, except that coupled cavity twts are designed with attenuation between the slowwave structure instead of a drift tube. The dispersion simulation result is obtained more consistent with experiment data than the method that ignoring effect of the conducting barrel. Pulsed products xband, coupled cavity twts microwave. Model of coupled cavity traveling wave tube the model of a coupled cavity twt is illustrated in figure 1.
Vts5753 datasheet, vts5753 datasheets, vts5753 pdf, vts5753 circuit. Reviseu ht iur3 a 0 a fixiaiiy a symmetric ring for. The slowwave structure gives the twt its wide bandwidth. Coupled cavity traveling wave tubes operating instructions. A fast and accurate onedimensional largesignal model for coupled cavity twts has been developed that can be used interactively for the optimization of a twt design. A coupled cavity traveling wave tube 10, 10 is provided having a velocity taper, i. Modeling of drive induced oscillation in a coupled cavity twt. Cpi pulsed coupled cavity twt,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors.
Jun 04, 2020 the twt belongs to a category of linear beam tubes, such as the klystron, coupled cavity twt in which the radio wave interacts with the beam in a. This paper describes an approach of designing a coupledcavity slow wave structure ccsws for a high power traveling wave tube twt using hfss code, which is a 3d high frequency. Global traveling wave tubes twt market research report 2020. In early helixtwts using a glass envelope, a coupled helix attenuator was used to prevent the device from oscillation.
Pdf analysis of a coupledcavity slow wave structure for a twt. Experimental investigation of a highpower kaband folded. Applied systems engineering, inc twt,klystron,magnetron. The electron beam shown in figure 9 as red beam is velocity modulated by an rf input signal at the first resonant cavity. Vtc5763a pulsed coupled cavity twt, vtc5763a datasheet, vtc5763a circuit, vtc5763a data sheet. The tube is modeled as a sequence of interaction gaps and tunnels, with cavities associated with each gap. Vts5753 pdf, vts5753 description, vts5753 datasheets. A method of calculation of coupled cavity twt performance which is programmable for fast and economical calculation on a timesharing computer is presented. Request pdf design of wband coupledcavity twt by liga fabrication the laddercore structure of coupled cavity twts with dual inline coupling has attracted interest in a highpower mmwave. In early helixtwts using a glass envelope, a coupled helix attenuator was used to prevent the device from oscillation 2. In addition to providing extremely reliable high power, these. Consequently, there is considerable interest in the study and development of vband coupled cavity twt.
Average power klystron coupled cavity twt helix twt gridded tube mw 100 mw 10 mw 1 mw 100 kw 10 k w 0. However, advances in wband twt design have been limited since that achievement. Analysis of coupledcavity slowwave structures for space twt. For example, some embodiments provide a coupled cavity traveling wave tube including a plurality of core segments arranged in spacedapart fashion to form an electron beam tunnel, a first longitudinal member adjacent the plurality of core segments alternately extending toward and receding from successive core. Coupled cavity twt in which the radio wave interacts with the beam in a series of cavity. Request pdf a 500w coupledcavity twt for kaband communication worldwide demand for highpower amplifiers for digital satellite communication at kaband frequencies between 27 and 31 ghz is. All of these mismatches interact and are enhanced by the gain of the twt. Pulsed coupled cavity twt, vtx5786j datasheet, vtx5786j circuit, vtx5786j data sheet. The cavity configurations and boundary conditions required for obtaining several resonant frequencies for the first forward rf space harmonic of the cavity mode and the. Traveling wave tube an overview sciencedirect topics. Vtx5786j pdf, vtx5786j description, vtx5786j datasheets. Pdf longitudinal coupledcavity scheme for microwave. Pdf this paper describes an approach of designing a coupled cavity slow wave structure ccsws for a high power traveling wave tube twt using hfss. The coupling with atom 2 also introduces the oscillatory extra term.
Study of a high power sine waveguide traveling wave tube amplifier. However, some metal structure twts coupled cavity cc twt 8, fwg twt 9, 10, and so on can obtain high. Expanding to the bandwidth of the coupled cavity twts in mmw. For this application, the travelingwave tube may be an intermediate or final output. The key technology of efficiency enhancement for traveling wave. For example, the wband coupled cavity travelingwave tube, the slowwave amplifier with the highest average power capability at millimeterwave frequencies, can produce only up to 5 kw peak and 500 w average output power 32. Other articles where coupledcavity travelingwave tube is discussed. Such a result may be viewed as a consequence of the fact that the presence of the nonresonant atom 2 causes a cavity frequency pulling i.
The amount of stored energy in the power supply and the amount of time required to disconnect the power supply from the power source are important factors in. The resonant cavities are coupled together with a transmission line. An amplifying device comprises an electron gun emitting an electron beam, a collector spaced from the electron gun, the collector oriented to collect electrons of the electron beam emitted from the electron gun, and an interaction structure interposed between the electron gun and the collector. May 27, 2011 a kaband travelingwave tube twt was fabricated with a folded waveguide fwg as its slowwave structure. New version of fcifield charge interactioncode simulates beam dynamics of an electron beam running in a coupled cavity structure, such as a multicell output structure in a klystron amplifier, a coupled cavity twt amplifier, a bunching structure in an electron injector and also an rfgun with multicell accelerating cavity. Broadband, inverted slot mode, coupled cavity circuit. In this type of attenuator, a helix concentric and.
The slowwave structure has been modeled and coldtest characteristics data were obtained. The helix twt, however, has no particular bandwidth limitations, and, for all practical purposes, an octave bandwidth 100 percent is attainable. The coupled cavity structure for the coupled cavity twt 15 includes a plurality of adjacent cavities 24 separated by rectangular polepieces 32. The simple calculation method for realizing coalescent mode is given. Browns work to adapt magnetron principles to create a new broadband amplifier is generally recognized as the first cfa, which he called an amplitron.
Development of high power coupledcavity travelling wave. This rf energy travels along the cavities and induces rf voltages in each subsequent cavity. Standard product data sheets are available for download in pdf format. Analysis of a coupledcavity slow wave structure for a twt. Figure helix twt market forecast and cagr 20202025 volume 1. Various embodiments of a coupled cavity traveling wave tube are disclosed herein. The beam is treated as a series of rigid but mutually penetrable disks. For broadband applications, the helix is almost exclusively used, while for highaveragepower applications, such as radar transmitters, the coupled cavity circuit has. Background the source of gain ripple is the feedback mechanism caused by the reflection of the forward waves in the backward direction and by the reflection of the backward waves in the forward direction. Coupled cavity twt traveling wave tube power amplifier, xband, courtesy of mit lincoln laboratory, used with permission. To read and print pdf files, download adobe acrobat reader. The coupled cavity slow wave structure is a stack of circular cavities, which are coupled to each other through their common wall. Coupled cavity twt the coupled cavity twt uses a slow wave structure of a series of cavities coupled to one another.
Most notably, a coupled cavity twt developed at varian, inc. The slowwave structure of the multiplebeam coupling cavity travelingwave tube consists of a coupling cavity chain connected by pole shoes and copper rings. Cpi, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Pulsed coupled cavity twt, vts5753 datasheet, vts5753 circuit, vts5753 data sheet. Vtx5786j datasheet, vtx5786j datasheets, vtx5786j pdf, vtx5786j circuit. A travelingwave tube twt, pronounced twit or travelingwave tube amplifier twta. Designs using coupledcavity circuits have achieved peak output powers ranging from. The power capability of millimeter wave coupled cavity traveling wave tube cctwt is larger than other type twts, but the operating bandwidth is narrow. Cc twt, the attenuator is provided in the form of a lossy ceramic button on the spacer cavity wall of the coupled cavity structure. The required wave velocity reduction is achieved by reducing the resonant frequencies of the individual resonant cavities as a function of the distance from the electron gun 16, 16, through changes in.
Cpi, alldatasheet, datasheet, datasheet search site for electronic components. Two methods staggered bandwidth and coalescent mode design of expanding to the cctwt in nmw are described. Magic3d simulations of a 500w kaband coupledcavity. They are quite old books but they will give you a start in the area of cross field. By the method of the eigen mode expansion, a full threedimensional 3d model has been developed that can be used to investigate the beamwave interaction in a highpower, kaband relativistic coupledcavity travelingwave tube twt. The objective was to obtain 4 kw, cw with 1% bandwidth at 12. The beamwave interaction in a kaband relativistic coupled. As a fullmetal structure, coupled cavity has been shown to have excellent performance in power capability.
This device has a nonintercepting grid pulsed and single stage depressed collector to achieve 47. Request pdf modeling of drive induced oscillation in a coupled cavity twt a new physics based model suitable for multifrequency stability analysis of cctwts has been developed and. Pulsed coupled cavity twt, vtx5682a datasheet, vtx5682a circuit, vtx5682a data sheet. Electron gun produces electron beam, ccsws reduces the velocity of rf signal equal to the velocity of electron beam. Generalized ferruled coupled cavity, traveling wave tube twt circuit. Calculation of coupledcavity twt performance nasaads. Qualitative description of conventional and familiar. A travelingwave tube twt, pronounced twit or travelingwave tube amplifier twta, pronounced tweeta is a specialized vacuum tube that is used in electronics to amplify radio frequency rf signals in the microwave range. In this paper, the software coldtest simulation method to obtain rf dispersion, interaction impedance by mafia software is discussed considering effect of the conducting barrel in the millimeterwave twt. The electron beam is velocity modulated by an rf input signal at the first resonant cavity. Scheitrum, and bernard arfin, senior member, ieee abstractin order to make mm wave sources practical, improved fabrication method is required. A complete description of the beam trajectory is obtained by following the disks contained in a single beam wavelength ref.
More recently, a complex integralpolepieceferruleless coupled cavity foldedwaveguide circuit built by l3 communications, inc. Absolute instability near the band edge of travelingwave amplifiers. Computer program for analysis of coupledcavity travelingwave tubes. The interaction circuit employs threeslot doubly periodic. Cpi, alldatasheet, datasheet, datasheet search site for electronic components and. Us20060091830a1 folded waveguide traveling wave tube. Pdf novel coupledcavity twt structure using twostep. Expanding to the bandwidth of the coupled cavity twts in.
The interaction structure defines an electromagnetic path along which an applied electromagnetic. The electron beam shown in figure 9 as red beam is velocity modulated by an rf input signal at the first resonant. In a cc twt, the attenuator is provided in the form of a lossy ceramic button on the spacer cavity wall of the coupled cavity structure figure 5. Analysis of a coupledcavity slow wave structure for a twt nopr. Helix and coupledcavity travelingwave tubes ieee journals. Longitudinal coupledcavity scheme for microwaveexcited co2 slab lasers. Berger, in encyclopedia of physical science and technology third edition, 2003 vii. Coupled cavity slow wave structure coupled cavity twt the coupled cavity twt uses a slow wave structure of a series of cavities coupled to one another. The 3d particlein cell pic simulations of a kaband coupledcavity travelingwave tube cctwt. A kaband sheet electron beam seb travelingwave tube twt based on three slot staggeredladder tstl coupledcavity slowwave structure ccsws is. The power capability of millimeter wave coupled cavity traveling wave tube cctwt is larger than other type twts, but. Software cold test simulation of coupled cavity slowwave. The twt demonstrates more than 700w radiofrequency peak output power within a 2.
The use of liga to fabricate a couple cavity twt is presented. About the time that morton started work on the planar triode, rudolph kompfner of england conceived a device that became known as the travelingwave tube twt, which consisted of a gun structure to focus an electron beam down the center of a smallbore helical winding and a. Us4315194a coupled cavity traveling wave tube with. Different modeling techniques for enhancing the speed of the largesignal model with no loss in accuracy are discussed. Because this type of twt can be manufactured and assembled in an easy and cheap way, the fwg twt will be a competing highpower millimeter wave source, compared to helix and coupled cavity. The fields are expanded in terms of a sequence of stationary waves anchored on each gap, instead of a set of traveling waves.
A method of calculation of coupled cavity twt performance which is programmable for fast and economical calculation on a timesharing computer is. Coupledcavity travelingwave tube electronics britannica. Vtc5763a datasheet11 pages cpi vtc5763a pulsed coupled. Jb phase linearity of the 914h coupledcavity traveling. Our model of a coupled cavity travelingwave tube is illustrated by figure 1. The coupled cavity twt uses a slow wave structure of a series of cavities coupled to one another. Coupledcavity twt amplifiers deliver extremely high power. Novel coupledcavity twt structure using twostep liga. A theoretical analysis of the largesignal behavior of a coupled cavity twt is of immense. Study on kaband sheetbeam, threeslotstaggeredladder coupled. After 28 years of considerable research and development, two types of travelingwave tube twt circuits have captured the major portion of the production business. A cc twt consists of electron gun, coupled cavity slow wave structure, periodicpermanent magnet focusing system, input and output couplers and collector1. A helixfwg cascaded traveling wave tube testified the design method and is optimized. Vts5753 pdf, vts5753 description, vts5753 datasheets, vts5753.
Vtc5760b datasheet11 pages cpi vtc5760b pulsed coupled. Coupled cavity twt transmitter xband 15 4% air cooled coupled cavity twt transmitter. Cw products cband, coupled cavity twts microwave power. Calculation of coupledcavity twt performance ieee journals. Homogeneous and inhomogeneous coupling structures for coupled. This paper describes an approach of designing a coupledcavity slow wave structure ccsws for a high power traveling wave tube twt using hfss code. In the tube studied by us, a sever in the interaction section is used to restrain the oscillation of rf electromagnetic fields between the input and output end. A coupled cavity twt can achieve 60 kw output power.
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