Volume free electron laser vfel, volume distributed feedback. A conceptual design of a high efficiency sband backward wave oscillator driven by a 500 kv, 5 ka electron beam has been developed and analyzed. A conceptual design of a high efficiency sband backwardwave oscillator driven by a 500 kv, 5 ka electron beam has been developed and analyzed. Jan 24, 2019 tunability of backward thz wave parametric oscillation. This dissertation is brought to you for free and open access by the engineering etds at unm digital repository. Generation of broadband terahertz radiation using a. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them.
Experimental studies of the backward wave oscillator with a grid diffraction grating that is formed by a periodic set of metallic threads inside a. Backward wave oscillator how is backward wave oscillator. This page compares bwo backward wave oscillator vs bwa backward wave amplifier and mention difference between bwo and bwa including applications, principle of operation and features. We present an imaging system designed for use in the terahertz range. Request pdf high power angular radial staggered vane backward wave oscillator at wband a angular radial staggered vane arsv slow wave structure sws is proposed for high power vacuum devices. We have recently made some measurements of the voltage distribution along the slowwave circuit of our travellingwavetube analogue, operated as a backwardwave oscillator, which are of. High power angular radial staggered vane backward wave. Jan 22, 2016 backward wave oscillator a backward wave oscillator bwo, also called carcinotron a trade name for tubes manufactured by csf, now thales or backward wave tube, is a vacuum tube that is used to. The link to difference between terms such as twt vs klystron are also provided here. In this work, a backward wave oscillator bwo with triangularly corrugated periodic metallic slow wave structure trcsws driven by an infinitely thin annular electron beam is studied using linear theory. As the radiation source a backward wave oscillator was chosen for its special features such as high output power, good wave front quality, good stability, and wavelength tunability from 520 to 710 ghz. Terahertz imaging system based on a backwardwave oscillator.
The figure1 depicts cross section of backward wave oscillator. Apr 21, 2005 the dispersion relation of a corrugatedwall resonator with an inner coaxial structure has been analyzed as well as the effects of the corrugation period, amplitude and the radius of the coaxial structure on it. In the electron gun, current is drawn from the cathode when the accelerator voltage. We have recently made some measurements of the voltage distribution along the slowwave circuit of our travellingwavetube analogue, operated as. Initially, a design study is presented for a wband planar coupledcavity backward wave oscillator at 94.
Find out information about backward wave oscillator. The dispersion relation of a corrugatedwall resonator with an inner coaxial structure has been analyzed as well as the effects of the corrugation period, amplitude and the radius of the coaxial structure on it. Terahertz, backward wave oscillator, vacuum electronics. An electronic device which amplifies microwave signals simultaneously over a wide band of frequencies and in which the traveling wave produced is reflected. The beam is then injected into a hollow rippled wall. A backward wave oscillator bwo, also called carcinotron a trade name for tubes manufactured by csf, now thales or backward wave tube, is a vacuum tube that is used to generate microwaves up to the terahertz range.
A relativistic backward wave oscillator with a modulating resonance. Elliott wave oscillator free download of the elliott wave oscillator indicator by collector for metatrader 4 in the mql5 code base. Progress in theoretical design and numerical simulation of high power terahertz backward wave oscillator hai zhang1, jianguo wang1. Development of a 2 mw relativistic backward wave oscillator. In this paper, a high power relativistic backward wave oscillator bwo experiment is reported. Starting energy and current for a large diameter finite. Free electron lasers slowwave devices magnetrons, cerenkov masers. Efficient generation regime with a high power output has been experimentally realized in a klystronlike relativistic backward wave oscillator, in which a modulation cavity is inserted between the slow wave structure to decrease the energy spread of modulated beam electrons, and an extraction cavity is employed at the end of the slow wave structure to further recover energy from the electron beam. Efficient generation of multigigawatt power by a klystron. Relativistic backward wave oscillator with a gaussian radiation pattern and related technologies ahmed elfrgani follow this and additional works at. Backwardness definition of backwardness by the free dictionary. They allow users to control frequency in a very wide band and with extremely high speed. The backward wave oscillator the backward wave oscillator bwo is a microwavefrequency, velocitymodulated tube that operates on the same principle as the twt.
We determine the requirements on electron beam current and emittance for the system to oscillate based on a threedimensional extension of our previous twodimensional analysis. The carcinotron is an mtype backward wave oscillator in which the electron stream traverses the tube and interacts with the fields on the slow wave structure under conditions where the electric and magnetic fields are perpendicular to each other. You must be logged in to scitation to activate your free access. Temkin, fellow, ieee abstractin this paper, we present the design of a microwave generator using metamaterials mtms in a negative index. Backward wave oscillator how is backward wave oscillator abbreviated. It can produce high power at millimeter wavelengths because as a fastwave device its dimensions can be much larger than the wavelength of the radiation. Figure 1a shows a conceptual diagram of a device for backward tpo with slantstripetype periodically poled lithium niobate ppln, in. This page compares bwobackward wave oscillator vs bwabackward wave amplifier and mention difference between bwo and bwa including applications, principle of operation and features. As the radiation source a backwardwave oscillator was chosen for its special features such as high output power, good wavefront quality, good stability, and wavelength tunability from 520 to 710 ghz.
A 230 kv, 2 ka, and 150 ns relativistic electron beam source is developed using a marx generator. This page on backward wave oscillator bwo vs twt provides difference between backward wave oscillator bwo and twt. Backwardwave oscillator metadata this file contains additional information such as exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. The electron beam is assumed to be guided by a strong magnetic field. The carcinotron is an mtype backwardwave oscillator in which the electron stream traverses the tube and interacts with the fields on the slowwave structure under conditions where the electric and magnetic fields are perpendicular to each other. Backward wave oscillator vs twtdifference between bwo and twt.
Review on microwave generation using backward wave oscillator. Backward wave oscillator article about backward wave. Linear analysis of a backward wave oscillator with. The heart of the system is a russian backwardwave oscillator bwo tube that is tunable over 225350 ghz. A backward wave oscillator bwo, also called carcinotron or backward wave tube, is a vacuum. Terahertz backward wave oscillator circuits university of utah. Backward wave oscillator basics, structure, working and. Otype backwardwave oscillator how is otype backward.
Diamondbased submillimeter backward wave oscillator. Efficient generation regime with a high power output has been experimentally realized in a klystronlike relativistic backward wave oscillator, in which a modulation cavity is inserted between the slow wave structure to decrease the energy spread of modulated beam electrons, and an extraction cavity is employed at the end of the slow wave structure to further recover energy from the electron. Bwo vs bwadifference between bwo and bwa in rf microwave. Offered sources wide banded, reliable, small sized, powerful and easy to operate. Further, output powers of several bwos combines in a typical manner which resulted power multiplication order of 2. Read diamondbased submillimeter backward wave oscillator, proceedings of spie on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Otype backwardwave oscillator how is otype backwardwave oscillator abbreviated. Pdf investigation of asymmetric mode competition in a. Backwardness definition of backwardness by the free. Experimental studies of the backward wave oscillator with a grid di. Backward wave oscillator metadata this file contains additional information such as exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. An 0type carcinotron backward wave oscillator operating between 850 ghz was built with the support of the european space agency. Highefficiency relativistic backwardwave oscillator. Bwos,1 like free electron lasers2 and gyrobwos,3,4 are tunable but the main advantages of a pseudospark driven bwo over these similar devices are portability and low cost due to not having to use either a high magnetic.
Study of the generation intensity in the backward wave. Oct 09, 2015 backward wave oscillator bwo a backward wave oscillator bwo, also called carcinotron trade name or backward wave tube, is a vacuum tube that is used to generate microwaves up to the terahertz range. Particleincell simulation for wband power combiner. Backward wave excitation and generation of oscillations in free electron lasers in the absence of feedback beyond the high gain approximation yosef pinhasi, asher yahalom, yuri lurie, gad a. Each source includes a submm wave bwo backeward wave oscillator tube and a specially designed permanent magnet. Pinhasi, faculty of engineering the college of judea and samaria, ariel 44837, israel abstract quantum and free electron lasers fels are based on. Oct 04, 2017 in this video, i have explained backward wave oscillator with following topics.
Electron beam requirements for a threedimensional smith. Tunable backward terahertzwave parametric oscillation. The backwardwave oscillator the backwardwave oscillator bwo is a microwavefrequency, velocitymodulated tube that operates on the same principle as the twt. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to. Pulsewidth limitation in the relativistic backward wave oscillator. In this paper, the exact relation of magnetic field required in high power microwave generation using backward wave oscillator bwo is found. An 0type carcinotron backwardwave oscillator operating between 850 ghz was built with the support of the european space agency. Utilizing a twosection slow wave structure, where the spatial period of the second section is larger than that of the first section, a bwo efficiency of greater than 50% was calculated.
High power microwave generation by relativistic backward. Diagram of basic principle of backwardwave oscillator. In this video, i have explained backward wave oscillator with following topics. Like the bwo power supply control, the operation of this unit is also. A mmwave sweeper has been built with the bwo tube to sweep the entire frequency range within 1 s. Tunability of backward thzwave parametric oscillation. The triangular axial profile of the sws is approximated by a fourier series in order to apply the linear rayleigh. Media in category backward wave oscillator the following 8 files are in this category, out of 8 total. Backwardwave oscillator a backward wave oscillator bwo, also called carcinotron a trade name for tubes manufactured by csf, now thales or backward wave tube, is a vacuum tube that is used to. Study on oscillation starting condition of kband oversized. Progress in theoretical design and numerical simulation of. It is an oscillator with a wide electronic tuning range 9.
Backward wave oscillator vs twtdifference between bwo and. Two examples of slowwave circuit characteristics are shown, in the. Development of backward wave oscillators for terahertz. Theoretical investigation of a backward wave oscillator. Experimental study of surfacewave oscillator with different. Application of oilfree vacuum and electrochem ical polishing of the sws surface in an xband bwo allowed generation of 3gw, 26ns microwave pulses with. Pdf backward wave oscillator for high power generation at thz. Otype backwardwave oscillator how is otype backwardwave. Particleincell simulation for wband power combiner multi. Insight product company offers submm wave sources from 179 ghz to 1250 ghz. Free download of the elliott wave oscillator indicator. Characterization of a free interdigital line fidl circuit was performed in a tube body with a dispenser cathode and a threeanode pierce gun.
This page on backward wave oscillatorbwo vs twt provides difference between backward wave oscillatorbwo and twt. A smithpurcell device can operate as a backwardwave oscillator for intense, narrowbandwidth, continuous wave radiation at terahertz wavelengths. Radiation pulse with power about 1 kwatt was registered. It is numerically simulated using cst particleincell pic3d simulator and same design validated with another pic3d code. In the experiment, the voltage and current change in time as shown in fig. The bwos will be used by the national aeronautics and space administration as local oscillator sources in heterodyne receivers for lowbackground astronomy observations and remote sensing. It sustains the oscillations by propagating a traveling wave backwa.
This dissertation is brought to you for free and open access by the. Experimental study of surfacewave oscillator with different electron. Sweep oscillator model 8690, operating and service manual, palo alto, u. Backward wave excitation and generation of oscillations in. Pdf on aug 23, 2017, xiang li and others published backward wave oscillator for high power generation at thz frequencies find, read. Theoretical investigation of a backward wave oscillator ma qiaosheng 1 zhou chuanmin wu yong institute of applied electronics, china academy of engineering physics, mianyang 621900, china abstract from the linear vlasov equation, the theoretical investigation on relativistic backward wave oscillator is performed. It is an oscillator with a wide electronic tuning range. Find backwardwave oscillator related suppliers, manufacturers, products and specifications on globalspec a trusted source of backwardwave oscillator information. Detection is achieved with a pyroelectric sensor operated at room temperature. The circuit is propagating a wave to the left with a funda mental phase shift b,l per period. A vband overmoded relativistic backward wave oscillator rbwo guided by low magnetic field and operating on a tm03 mode is presented to increase both the power handling capacity and the wave. Belonging to the traveling wave tube family, it is an oscillator with a wide electronic tuning range.
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