Generation of powerful subnanosecond microwave pulses in the range of 38-150 GHz

Yalandin, M. I.; Shpak, V. G.; Shunaĭlov, S. A.; Oulmaskoulov, M.R.; Ginzburg, N. S.; Zotova, I. V.; Novozhilova, Yu. V.; Sergeev, A. S.; Phelps, A. D. R.; Cross, A. W.; Wiggins, Mark; Ronald, K.

doi:10.1109/27.901243

Cited by 52 publications

(16 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Frequency measurements using a set of cut-off waveguide filters show that the pulse spectrum has a central frequency in the interval 0.13-0.15 THz. The peak power of generated SR pulses was estimated by integrating the detector signal over the directional pattern and achieved of 50-70 MW, that strongly exceeds the value obtained in the previous sub-terahertz experiments [5] with singlemode waveguides.…”

Section: Generation Of Sub-thz Sr Pulses Based On Excitation Of Surfamentioning

confidence: 67%

Generation of single and periodically repeated powerful ultrashort microwave pulses

Zotova

2017

EPJ Web Conf.

Self Cite

View full text Add to dashboard Cite

Generation of powerful ultrashort microwave pulses (USP) is of interest for a large number of practical applications, including radars with high resolution, plasma diagnostics, spectroscopy etc. In order to achieve this purpose many methods well-known in laser physics can be implemented in microwave electronics.In the last decade significant progress was achieved in generation of microwave USPs based on classical superradiance (SR) of extended electron bunches. Using of this effect a new type of pulse sources has been developed, which are capable of producing uniquely short (under 0.2-1 ns) electromagnetic pulses at super-high peak powers exceeding 1 GW in the millimeter waves (Kaband) and 3 GW in the centimeter waves (X-band) with a repetition frequency up to several kilohertz [1]. A natural continuation of this research is related with the promotion of SR sources in shorter wavelengths ranges, where the oversized waveguides should be used. In the first part of this paper the results of the experimental observation of SR emission with excitation of a surface wave in the oversized periodically corrugated slow wave structures are presented. The experiments were based on a theoretical consideration in the frame of the quasi-optical approach.A periodic train of powerful ultrashort microwave pulses with a repetition frequency of 10-100 MHz can be generated in electron oscillators with a saturable absorber installed in the feedback loop [2]. The mechanism of pulse formation in this case is similar to the passive mode-locking [3] in laser physics where such pulses are also treated as dissipative solitons. The second part of this paper is devoted to the theoretical analysis of solitons generation in a mode-locked two-section microwave oscillator consisting of Cherenkov TWT and a Kompfner absorber in the feedback loop. Generation of Sub-THz SR Pulses Based on Excitation of Surface Waves in Oversized WaveguidesCherenkov SR of electron bunch exciting the surface wave in an oversized corrugated cylindrical waveguide (Fig. 1a) can be considered within a quasi-optical approach [4]. In this case the radiation field near a shallow corrugation is presented as a sum of two counterpropagating TM polarized wave-beams: , (1) propagation and mutual coupling of which is described by two non-uniform parabolic equations. The synchronous interaction of electrons with a forward partial waves leads to development a self-bunching and formation of powerful SR pulse.Simulations show that the most optimal conditions for SR emission correspond to excitation of the backward surface wave near the Bragg frequency ( S -regime, Fig.1b). For parameters of an electron bunch formed by an accelerator RADAN (electron energy of 300 keV, a total current of 2 kA, a bunch duration of 500 ps) and a corrugated waveguide with the mean radius of 3.75 mm, corrugation period of 0.825 mm, and corrugation depth of 0.36 mm the operating frequency in the resonant point is of 0.14 THz ( 0 2 3.5 r O | ). In this case the power of generated SR pulse emitted in z directi...

show abstract

Section: Generation Of Sub-thz Sr Pulses Based On Excitation Of Surfamentioning

confidence: 67%

Generation of single and periodically repeated powerful ultrashort microwave pulses

Zotova

2017

EPJ Web Conf.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Alongside the investigation of the generation of subnanosecond SR pulses at Ka-band, similar experiments are performed at W-band (75 GHz) and G-band (150 GHz) [19]. The Wband SR pulses possessed a sharp leading edge < 120 ps and peak power ∼10-15 MW.…”

Section: B Experimental Observation Of Cherenkov Sr In Uniform Slow mentioning

confidence: 99%

“…The boundary conditions to (19) correspond to the absence of electromagnetic energy fluxes from outside:…”

Section: G Eneration Of Terahertz Sr Pulses By Multipicosecond Elementioning

confidence: 99%

“…It is typical for such a type of emission that the electrons simultaneously radiate at many frequencies that depend on the observation angle. Our model describes stimulated emission and (19), (20) obviously include the electrons' microbunching. In contrast to spontaneous emission, stimulated emission is usually characterized by a narrow frequency band.…”

Section: G Eneration Of Terahertz Sr Pulses By Multipicosecond Elementioning

confidence: 99%

See 1 more Smart Citation

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

Zotova

Cross

Phelps

et al. 2013

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

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.

show abstract

“…Farokhi et al [83] have presented a linear theory for a free electron laser with a three-dimensional helical wiggler and axial magnetic field in the collective regime in a configuration consisting of an annular electron beam propagating inside a cylindrical waveguide. For the generation of high power (140 MW) subnanosecond (75 ps) microwave pulses in the range of 38 -150 GHz, Yalandin et al [84] have done experiments on coherent stimulated radiation from intense, subnanosecond electron bunches moving through a periodic waveguide and interacting with a backward propagating TM01 wave. Hayashi et al [85] have also designed a two-stage ferroelectric electron gun and a peak power of 5.9 MW microwave radiation was observed when a 100A 450 kV electron beam was used.…”

Section: Applications and Future Prospectsmentioning

confidence: 99%

Electromagnetic Waves and Their Application to Charged Particle Acceleration

Malik¹

2013

Wave Propagation Theories and Applications

View full text Add to dashboard Cite

Generation of powerful subnanosecond microwave pulses in the range of 38-150 GHz

Cited by 52 publications

References 15 publications

Generation of single and periodically repeated powerful ultrashort microwave pulses

Generation of single and periodically repeated powerful ultrashort microwave pulses

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

Electromagnetic Waves and Their Application to Charged Particle Acceleration

Contact Info

Product

Resources

About