Other articles where coupledcavity travelingwave tube is discussed. Pdf analysis of a coupledcavity slow wave structure for. More recently, a complex integralpolepieceferruleless coupled cavity foldedwaveguide circuit built by l3 communications, inc. It is meaningful to point out that mode splitting can also occur in a single twcavity system by introducing structural perturbations on the cavity 17, 18. Designmethodologyapproach mkk proposed by malykhin, konnov, and komarov equivalent circuit model is used to describe the coupled. Mode splitting is observed for both directly cavity cavity and indirectly cavity waveguide cavity coupled cavity systems. A fast and accurate onedimensional largesignal model for coupledcavity twts has been developed that can be used interactively for the optimization of a twt design.
Coupledcavity travelingwave tube electronics britannica. Mode splitting is observed for both directly cavitycavity and indirectly cavitywaveguidecavity coupled cavity systems. Operation is similar to that of a klystron, except that coupledcavity twts are designed with attenuation between the slowwave structure instead of a drift tube. Dispersion, coupled cavity slowwave structures ccsws, traveling wave tube, staggered structure, coupling slots pacs no 84. The centertocenter distance between accelerating gaps is, where. The paper describes investigations carried out using a onedimensional largesignal computer model into the best choice of sever position in coupledcavity twts. 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. Coupledcavity twt interaction is similar to helix twt interaction in one respect. Analysis of a coupledcavity slow wave structure for a twt nopr. Determination of sever positions in coupledcavity twts. They are quite old books but they will give you a start in the area of cross field.
Coupled cavity semiconductor lasers have the potential of offering mode selectivity together with wavelength tunability. The twt has overall dimensions of 36 mm wide by 310 mm long by 39 mm tall and weighs less than 1kg which has vacuum pump to ensure function of maintenance free. Request pdf an overmoded wband coupledcavity twt a 94ghz overmoded travelingwave tube twt has been designed, fabricated, and successfully tested. Dispersion, coupledcavity slowwave structures ccsws, traveling wave tube, staggered structure, coupling slots pacs no 84. The coupledcavity twts are capable of peak powers from tens to hundreds of kilowatts, with up to 10% duty cycle. Pdf in order to make millimeterwave sources practical, improved fabrication. Pdf novel coupledcavity twt structure using twostep liga. Helix and coupledcavity travelingwave tubes ieee journals. Software cold test simulation of coupled cavity slowwave. The coupledcavity circuit design was obtained using id design codes christinecc and cpi 1d cctwt code as well as 2.
Mar 04, 2011 matt 34 has invited a thread on band pass, more correctly called coupled cavity subs. The effects of direct and indirect couplings, if coexisting in one system, can offset each other. Aug 26, 2014 purpose the purpose of this paper is to present a 2. Pdf this paper describes an approach of designing a coupledcavity slow wave structure ccsws for a high power. Helix and coupled cavity travelingwave tubes abstract. The coupled cavity twt uses a slow wave structure of a series of cavities coupled to one another. Osa coupled mode theory analysis of modesplitting in. However, advances in wband twt design have been limited since that achievement. Results of the effects of sever position on saturated efficiency, tube length and bandwidth are presented.
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 segments, and a second longitudinal. Coupled cavity twt in which the radio wave interacts with the beam in a. A coupledcavity twt can achieve 60 kw output power. Design of wband coupledcavity twt by liga fabrication. The slowwave structure has been modeled and coldtest characteristics data were obtained. Design of phase velocity tapers in coupledcavity twts.
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. He is leading research and development on ultra high power microwave sources. Combined with design of the wellmatched input and output couplers, a 3d particleincell model of the sheetbeam coupled cavity travelingwave tube is constructed. Most notably, a coupled cavity twt developed at varian, inc. The efficiency of travellingwave tubes twts operated under nonlinear conditions is usually enhanced by adjusting the phase velocity of the slowwave circuit towards the output end of the tube.
Analysis of a coupledcavity slow wave structure for a twt. Computer program for analysis of coupledcavity traveling. Computer program for analysis of coupledcavity travelingwave tubes by denis j. Low chirp and highspeed operation of transverse coupled. Omalley lewis research center summary a flexible, accurate, largesignal computer program has been developed for the design of coupled cavity travelingwave tubes. Travelingwave tube wikimili, the free encyclopedia. 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. Jb phase linearity of the 914h coupledcavity traveling. This paper describes an approach of designing a coupledcavity slow wave structure ccsws for a high power traveling wave tube twt using hfss code. The present invention comprises an electron gun, a double ridged coupled cavity interaction circuit and a beam collector.
The helix twt, however, has no particular bandwidth limitations, and, for all practical purposes, an octave bandwidth 100 percent is attainable. Sw cavity system can perform the same functions as an under coupled tw cavity system. Modeling of coupled cavity twt with tesla request pdf. Matt 34 has invited a thread on band pass, more correctly called coupled cavity subs. Combined with design of the wellmatched input and output couplers, a 3d particleincell model of the sheetbeam coupledcavity travelingwave tube is constructed. Ship, airborne and groundbased mobile radar systems. Omalley lewis research center summary a flexible, accurate, largesignal computer program has been developed for the design of coupledcavity travelingwave tubes. After 28 years of considerable research and development, two types of travelingwave tube twt circuits have captured the major portion of the production business. Coupled mode theory analysis of modesplitting in coupled. These speakers certainly extended the bass of the 10 inch drivers especially because the bass roll of is second order. 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. Purpose the purpose of this paper is to present a 2.
The extraction of electromagnetic energy from a resonant cavity, either waveguide or coaxial, using loops, probes, or apertures. The paper describes investigations carried out using a onedimensional largesignal computer model into the best choice of sever position in coupled cavity twts. Coupledcavity products and components warranty helix. The coupledcavity twt uses a slow wave structure of a series of cavities coupled to one another. Computer program for analysis of coupled cavity travelingwave tubes by denis j. Tell a friend about us, add a link to this page, or visit the webmasters page for free fun content. For example, hughestype coupled cavity has been used to develop a 75 watts, 5964 ghz twt 10. For some applications it is desirable to have a semiconductor laser whose wavelength can be tuned over a wide range, at least discretely. Coupled cavity gyrotrontravelingwavetube amplifier choi. Directcoupled cavity how is directcoupled cavity abbreviated.
More recently, a complex integralpolepieceferrulelesscoupledcavity foldedwaveguide circuit built by l3 communications, inc. 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. Coupledcavity twts are used for high power communication links and frequency. A travelingwave tube twt, pronounced twit or travelingwave tube amplifier twta. Design of a 100w vband coupledcavity travelingwave tube. Helix and coupledcavity travelingwave tubes abstract. The eigenmode calculations and linear smallsignal analyses by larsen et al. Coupledcavity traveling wave tube twt amplifiers are reliable and compact. This highefficiency cc twt is designed for use in satellite communication amplifiers custom configurations are also available. We analyze transmission characteristics of two coupled identical cavities, of either standingwave sw or travelingwave tw type, based on temporal coupled mode theory. The slowwave structure gives the twt its wide bandwidth. The present invention is a coupled cavity gyrotrontravelingwavetube amplifier which produces highly efficient, broad band millimeter wave radiation. A coupledcavity drifttube linac ccdtl combines features of the alvarez drifttube linac dtl and the. 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.
Various embodiments of a coupled cavity traveling wave tube are disclosed herein. Jan 05, 1999 the present invention is a coupled cavity gyrotrontravelingwavetube amplifier which produces highly efficient, broad band millimeter wave radiation. Coupled cavity products and components helix travelingwave tubes and components klystrongyrotron products and components eimac powergrid products and components pub. Klystron traveling wave tube crossed field amplifier voltage 1 mw requires 90kv 1 mw requires 90kv 1 mw requires 40kv gain 30 70 db 30 70 db 8 30 db bandwidth 1 8 % 10 35 % 10 15 % xrays severe, but lead is reliable severe, but lead is reliable not a problem efficiency basic 15 30 % 15 30 % 35 45 % with depressed 40 60 % 40. An equivalentcircuit representation of the coupled cavity travelingwave paramietric amplifier is shown in fig. Related content 40 gbps modulation of transverse coupled cavity vcsel with push pull modulation scheme hamed dalir and fumio koyamahighspeed operation of bowtieshaped oxide aperture vcsels with. Sw cavity system can perform the same functions as an undercoupled tw cavity system. The dispersion simulation result is obtained more consistent with experiment data than the method that ignoring effect of the conducting barrel.
Travellingwave tubes chapter 14 microwave and rf vacuum. Coupledcavity products and components helix travelingwave tubes and components klystrongyrotron products and components eimac powergrid products and components pub. It is meaningful to point out that mode splitting can also occur in a single tw cavity system by introducing structural perturbations on the cavity 17, 18. Coldtest characteristics including dispersion and coupling impedance of a coupledcavity slowwave structure for space twt working in millimeter band have been simulated by selfdesigned software. However, a magnetron is an oscillator and a cfa is an amplifier although a cfa can be driven to oscillate by application of improper low voltages as can any amplifier. Coupled cavity twt traveling wave tube power amplifier, xband, courtesy of mit lincoln laboratory, used with permission s band, coaxial magnetron, courtesy of cpi, used with permission sband tr transmit receive module, courtesy of macom technology solutions, used with permission. The resonant cavities are coupled together with a transmission line. The vta6430a series are 500w cw coupled cavity twts covering 27.
Nov 10, 2007 coldtest characteristics including dispersion and coupling impedance of a coupled cavity slowwave structure for space twt working in millimeter band have been simulated by selfdesigned software. Direct coupled cavity how is direct coupled cavity abbreviated. The electron beam shown in figure 9 as red beam is velocity modulated by an rf input signal at the first resonant cavity. A novel coupled cavity structure for highpower wideband millimeterwave twt, called sheetbeam coupled cavity, is proposed by simon j. The 87cavity twt circuit was directly machined from glidcop. Pdf analysis of a coupledcavity slow wave structure for a twt. Analysis of coupledcavity slowwave structures for space twt. All of these mismatches interact and are enhanced by the gain of the twt. Coupled cavity subs audioholics home theater forums.
1668 881 383 1385 528 260 493 929 261 1462 81 1570 199 664 809 498 561 698 1358 1670 13 104 41 894 342 125 946 576 1248 588 61 587 455 1343 603 892 1127 1058 312 1139 269 1063 977 105 782