Coherent summation of power of nanosecond relativistic microwave oscillators

Elchaninov, A. A.; Klimov, A. I.; Koval’chuk, O. B.; Mesyats, G. A.; Pegel, I. V.; Romanchenko, I. V.; Rostov, V. V.; Sharypov, K. A.; Yalandin, M. I.

doi:10.1134/s1063784211010099

Cited by 51 publications

(26 citation statements)

References 10 publications

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“…The results [26]- [28] let rise to investigations of advanced HPM systems like phased antenna arrays on the basis of X-band SR BWOs without electrodynamic coupling [29], [30]. As in [31], SR BWOs are capable of operating at high-pulse repetition rates and demonstrating stability of both microwave pulse amplitude and shape.…”

Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 87%

“…The maximum rate rise of the voltage attained is 430 kV/ns. The shift of the sharpened pulse front (by ∼100 ps per 3 kA/m) allowed a controllable relative phase shift of the radiation in the channels within more than the period T X .C h a racteristic dispersion of the phase difference is kept at a level of several picoseconds [29]. This provided experimental demonstration of superradiative directional pattern scanning in free space.…”

Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 96%

“…For experiments [29], [30], a laboratory setup (Fig. 7) based on a SINUS-200 high-voltage accelerator with a pulse forming line (PFL) of impedance 30 and electrical length 9 ns is used.…”

Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 99%

“…The vacuum diodes and the SWSs of the SR BWO are identical in geometry and are placed inside the solenoids (B-field of ∼0.5 T) connected in series to the dc supply. In the first stage of the experiments [29], a single peaking switch (peaker) based on a nonlinear line with an unsaturated ferrite section is located at the output of the PFL, as shown in Fig. 8.…”

Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

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: 87%

Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 96%

“…For experiments [29], [30], a laboratory setup (Fig. 7) based on a SINUS-200 high-voltage accelerator with a pulse forming line (PFL) of impedance 30 and electrical length 9 ns is used.…”

Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 99%

Section: Coherent Summation Of Sr Pulses Emitted From Several Chanmentioning

confidence: 99%

See 2 more Smart Citations

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

Zotova

Cross

Phelps

et al. 2013

IEEE Trans. Plasma Sci.

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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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