Synphase operation of nanosecond relativistic 37-GHz backward-wave oscillators without electrodynamic coupling

Yalandin, M. I.; Shunaĭlov, S. A.; Ul’maskulov, M. R.; Sharypov, K. A.; Shpak, V. G.; Rostov, V. V.; Romanchenko, I. V.; Elchaninov, A. A.; Klimov, A. I.

doi:10.1134/s1063785012100264

Cited by 27 publications

(19 citation statements)

References 21 publications

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“…This provided experimental demonstration of superradiative directional pattern scanning in free space. It is pertinent that phase stabilization and RF pattern scanning for the two-channel X-band device stimulated further similar researches in the Ka-band, where both coherent power summation and pattern scanning are demonstrated todate for the elongated pulsewidth of (T pulse /T Ka ) ≈ 150 [32].…”

Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 98%

“…Section I describes the theoretical and experimental studies of Cherenkov mechanisms of SR in the process of interaction of an electron bunch with a backward wave. Recent experiments with phase synchronization of several SR pulse generators [26]- [32] are also discussed. Section II describes the simulation and experimental observation of amplification of SR pulses during propagation along quasi-stationary electron beams [33], [34].…”

mentioning

confidence: 99%

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Generation, Amplification, and Nonlinear Self-Compression of Powerful Superradiance Pulses

Zotova

Cross

Phelps

et al. 2013

IEEE Trans. Plasma Sci.

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The Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Abstract-Superradiance (SR) of electron bunches can be considered an effective method of production of ultrashort electromagnetic pulses. Different types of SR associated with different mechanisms (cyclotron, Cherenkov, and bremsstrahlung) of stimulated emission are observed experimentally in the millimeter and centimeter wavelength bands. Progress in this research has enabled a new type of generator to be created capable of generating unique short (under 200-300 ps) electromagnetic pulses at super high peak powers exceeding 1 GW in the millimeter and 3 GW in the centimeter waveband. Some new methods for further increasing of the SR pulse peak power along with the promotion of such sources to higher frequency bands are discussed. These new methods include phase synchronization of several SR pulse generators, the amplification of an SR pulse during its propagation along a quasi-stationary electron beam and nonlinear compression in the process of induced selftransparency.

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Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 98%

mentioning

confidence: 99%

Generation, Amplification, and Nonlinear Self-Compression of Powerful Superradiance Pulses

Zotova

Cross

Phelps

et al. 2013

IEEE Trans. Plasma Sci.

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“…Recently we've demonstrated [1][2][3] that X-band and Ka-band microwave pulses from two identical relativistic subgigawatt backward wave oscillators without electrodynamic coupling can be phase-synchronized within picoseconds that made a coherent power summation of directed microwave beams in a free space possible. A fundamentally important problem that should be solved for phase synchronization of the microwaves from independent HPM oscillators is time-stable emission of electron beams having identical and fast rate of the current rise at the inlet of slow-wave structures.…”

Section: Introductionmentioning

confidence: 99%

“…In the Ka-band experiment [3], two individual pulsed double forming lines (PDFLs) switched by integrated spark gap were used to form such accelerating pulses. In this case, the fronts of voltage pulses were synchronized so accurately, as it followed from the spread of spatial spark location in the gap of gas discharge switch.…”

Section: Introductionmentioning

confidence: 99%

Advances in coherent power summation of independent Ka-band HPM oscillators

Romanchenko

Rostov

Rukin

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

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Report demonstrates the results of coherent power summation from two nanosecond-width relativistic Kaband BWOs with the peak power above 200 MW in each channel. A peculiar feature of the experiment was in supplying the explosive electron emission cathodes with ultimate-stable split voltage pulse from an all-solid-state SOS modulator. Enhanced rate of the voltage rise provided stable emission of electron beams and minimized standard deviation of the microwaves phases between channels in the time scale down to 0.5 ps.

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“…In addition, an experimental study verified that two relativistic backward wave oscillators (RBWOs) working at gigahertz frequencies with gigawatt output power can be summed. [7][8][9][10] The coherent summation of fields radiated by their horn antennas was verified by imaging the expected interference pattern using a neon bulb array. Also, in Ref.…”

Section: Introductionmentioning

confidence: 99%

Efficient power combiner for THz radiation

et al. 2016

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Most dangerous explosive materials, both toxic and radioactive, contain nitrogen salts with resonant absorption lines in the frequency range 0.3-10 THz. Therefore, there has been growing interest in remotely detecting such materials by observing the spectrum of reflected signals when the suspicious material is interrogated by THz radiation. Practical portable THz sources available today generate only 20–40 mW output power. This power level is too low to interrogate suspicious material from a safe distance, especially if the material is concealed. Hence, there is a need for sources that can provide greater power in the THz spectrum. Generating and extracting high output power from THz sources is complicated and inefficient. The efficiency of vacuum electronic microwave sources is very low when scaled to the THz range and THz sources based on scaling down semiconductor laser sources have low efficiency as well, resulting in the well known “THz gap.” The reason for such low efficiencies for both source types is material losses in the THz band. In this article an efficient power combiner is described that is based on scaling to higher frequencies a microwave combiner that increases the output power in the THz range of interest in simulation studies. The proposed power combiner not only combines the THz power output from several sources, but can also form a Gaussian wavebeam output. A minimum conversion efficiency of 89% with cophased inputs in a lossy copper power combiner and maximum efficiency of 100% in a Perfect Electric Conductor (PEC)-made power combiner were achieved in simulations. Also, it is shown that the TE01 output mode is a reasonable option for THz applications due to the fact that conductive loss decreases for this mode as frequency increases.

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Synphase operation of nanosecond relativistic 37-GHz backward-wave oscillators without electrodynamic coupling

Cited by 27 publications

References 21 publications

Generation, Amplification, and Nonlinear Self-Compression of Powerful Superradiance Pulses

Generation, Amplification, and Nonlinear Self-Compression of Powerful Superradiance Pulses

Advances in coherent power summation of independent Ka-band HPM oscillators

Efficient power combiner for THz radiation

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