Relativistic Sub-THz Surface-Wave Oscillators With Transverse Gaussian-Like Radiation Output

Malkin, A. M.; Fedotov, A. É.; Zaslavsky, V. Yu.; Fil'chenkov, S. E.; Sergeev, A. S.; Egorova, E. D.

doi:10.1109/led.2021.3067170

Cited by 9 publications

(6 citation statements)

References 21 publications

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“…Beam thickness and distance between the beam and the corrugated surface are assumed to be 0.2 mm. Simulations based on quasi-optical theory [8] and on PIC-code CST Studio are is perfect agreement and demonstrate that oscillator can operate at the designed mode with electron efficiency up to 25% (Fig. 2), while the ohmic losses are less than 10%.…”

Section: Simulations and Design Of Surface-wave Oscillator With Trans...mentioning

confidence: 64%

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Transverse radiation input and output for planar relativistic surface-wave oscillators and amplifiers

Fedotov¹,

Malkin²,

Zaslavsky³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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Planar surface-wave resonators are very attractive for development of relativistic high-current sources of high-power subterahertz radiation, due to their unique mode selective features. However, evanescent nature of the surface operating wave guided by periodic grating brings a number of difficulties such as wave scattering at the grating edges, power leakage to the cathode, and high ohmic losses. To overcome these problems, we propose using a bi-periodical gratings providing decoupling of the surface wave to the Gaussian microwave beam traveling in the transverse direction. Moreover, the same principle can be used for power input in the relativistic extended-interaction klystron with surface-wave resonators. An analytical quasi-optical theory based on coupled-wave equations are developed for surface-wave resonators with transverse power input-output, as well for planar beam devices based on these resonators. It is shown that the transverse energy extraction significantly reduces the Ohmic losses down to 10% of the radiated power which is essential for sub-THz range. The simulations based on both the quasi-optical model and PIC simulations show that surface-wave oscillator driven by 600 kV, 1 kA could produce 140 MW of output power at 150 GHz with 25% efficiency. For 150 GHz amplifier with the similar beam, simulations predict the 20–40 MW of output power and 20–30 dB linear gain in 1% bandwidth.

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Section: Simulations and Design Of Surface-wave Oscillator With Trans...mentioning

confidence: 64%

“…To organize effective and practical radiation output in the planar relativistic high-power surface-wave oscillator, we have recently proposed [8] to apply an additional corrugation with a period twice larger than the period of the main corrugation (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Transverse radiation input and output for planar relativistic surface-wave oscillators and amplifiers

Fedotov¹,

Malkin²,

Zaslavsky³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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“…Spanning the 'THz gap' using vacuum electronic sources, whilst maintaining HP output, poses significant challenges, namely: (i) the avoidance of RF breakdown, (ii) the provision of adequate cooling and (iii) manufacturing limitations [8] associated with the small cavity dimensions. One promising type of slow-wave device where these difficulties can be resolved by making the interaction cavity diameter D several times the free space operating wavelength 𝜆, whilst introducing a cosinusoidal corrugation at the inner wall, is a surface wave oscillator (SWO) [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. In contrast to standard sources where 𝐷~𝜆, the interaction cavity of the SWO is oversized and therefore highly overmoded.…”

Section: Introductionmentioning

confidence: 99%

“…We present theoretical, analytical and numerical results for a SWO with a complex, two-dimensional periodic surface lattice (2D-PSL) interaction cavity and demonstrate high-order mode selection, achieved by coupling volume and surface fields to form a hybrid cavity eigenmode. Slow wave devices based on 2D-PSLs have been the subject of intensive research at the University of Strathclyde [9,[22][23][24][31][32][33][34] and also at the Institute of Applied Physics within the Russian Academy of Sciences [12][13][14][15][19][20][21], where a 32.5 GHz 2D SWO driven by a kiloamp, ~300-600 kV relativistic beam was developed [15].…”

Section: Introductionmentioning

confidence: 99%

Efficient, 0.35-THz Overmoded Oscillator Based on a Two-Dimensional Periodic Surface Lattice

MacLachlan

Robertson

Cross

et al. 2022

IEEE Trans. Electron Devices

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We present the theory, design and numerical modeling of a cylindrical, two-dimensional (2D) periodic surface lattice (PSL) intended for use as the interaction region of an electron beam driven, pulsed source. The production of 1.95MW peak, pulsed 0.35THz radiation with an electronic efficiency of 24% is reported. Mode selection in the oversized cavity, where the diameter D is almost 3.5 times larger than the operating wavelength 𝝀, is achieved by coupling volume and surface fields to form a coupled cavity eigenmode.We demonstrate the advantages (including enhanced output power and improved spectral purity) of using a 2D-PSL over a simpler 1D structure. The cylindrical 𝑫 𝝀~𝟑. 𝟓 ⁄ 2D-PSL demonstrates the 'proof-of principle' high-order mode coupling with the potential to increase 𝑫 𝝀 ⁄ to values of 20 or more for the realization of CW 2D-PSL sources or very powerful pulsed sources. The theory is applicable over a broad frequency range.

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“…At present, development of microwave sources operating in millimeter a wavelength bands with sub-GW output power is subject to active investigation [1][2][3]. Among the variants of such sources are the gyrotrons energized by helical relativistic electron beams formed by explosive emission cathodes.…”

Section: Introductionmentioning

confidence: 99%

Development and studies of a high-current relativistic gyrotron with a TM-type operating mode

Abubakirov¹,

Danilov²,

Денисенко³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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Relativistic Sub-THz Surface-Wave Oscillators With Transverse Gaussian-Like Radiation Output

Cited by 9 publications

References 21 publications

Transverse radiation input and output for planar relativistic surface-wave oscillators and amplifiers

Transverse radiation input and output for planar relativistic surface-wave oscillators and amplifiers

Efficient, 0.35-THz Overmoded Oscillator Based on a Two-Dimensional Periodic Surface Lattice

Development and studies of a high-current relativistic gyrotron with a TM-type operating mode

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