Electromagnetic noise of a nanosecond magnetized high-current electron beam

Shunaĭlov, S. A.; Mesyats, G.; Romanchenko, I. V.; Rostov, V. V.; Sadykova, A. G.; Sharypov, K. A.; Shpak, V. G.; Ul’masculov, M. R.; Yalandin, M. I.

doi:10.1063/1.5123414

Cited by 5 publications

(1 citation statement)

References 39 publications

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“…[1,2], and citations therein), research on the phase-stable excitation of high-current electron generators is ongoing [3][4][5][6][7][8][9][10][11]. Along with the use of external radiation sources [12][13][14][15], this mode is possible when a seed electromagnetic (EM) signal appears at a stable front of the beam, and has the required power and spectral range [16,17]. The higher the generation frequency, the shorter the current front needed, and in millimeter wave range, this is at the sub-nanosecond scale.…”

Section: Introductionmentioning

confidence: 99%

Emission Features and Structure of an Electron Beam versus Gas Pressure and Magnetic Field in a Cold-Cathode Coaxial Diode

et al. 2022

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The structure of the emission surface of a cold tubular cathode and electron beam was investigated as a function of the magnetic field in the coaxial diode of the high-current accelerator. The runaway mode of magnetized electrons in atmospheric air enabled registering the instantaneous structure of activated field-emission centers at the cathode edge. The region of air pressure (about 3 Torr) was determined experimentally and via analysis, where the explosive emission mechanism of the appearance of fast electrons with energies above 100 keV is replaced by the runaway electrons in a gas.

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Section: Introductionmentioning

confidence: 99%

Emission Features and Structure of an Electron Beam versus Gas Pressure and Magnetic Field in a Cold-Cathode Coaxial Diode

et al. 2022

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Multi-pass relativistic traveling-wave tube with simultaneous operation on symmetric and asymmetric modes

et al. 2020

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The advantages of using symmetrical and asymmetric eigenmodes of a slow-wave system (SWS) in a relativistic traveling-wave tube (TWT) with multi-pass amplification are discussed. The nonlinear theory of such a TWT amplifier is developed. The parameters of the SWS of the Ka-band TWT amplifier based on a combination of the lower symmetric E01 mode and the asymmetric hybrid HE11 mode are calculated. The calculated efficiency of the amplifier reaches 28% with a gain of about 40 dB. The results of the calculations are confirmed by 3D particle-in-cell (PIC) simulation, in which an output power of 200 MW and a total gain of about 40 dB are obtained when the amplifier is driven by a 500 keV/2 kA hollow electron beam with a total pulse duration of 25 ns. Amplification of short millimeter-wave pulses is also demonstrated in PIC simulations, in which an output peak power of about 180 MW with a pulse duration of the order of 1 ns is obtained.

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A magnetically insulated coaxial vacuum diode providing a reduced energy spread in the leading edge of a high-current electron beam

Lobanov,

Sadykova,

Sharypov

et al. 2023

Physics of Plasmas

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A magnetically insulated vacuum diode was modified to reduce the fraction of low-energy electrons in the leading edge of a high-current beam. The voltage pulse of duration ≈1 ns, rise time ≈250 ps, and amplitude ≈ –230 kV that arrives at the diode cathode from a transmission line is split in coupled coaxial lines (CLs) into two pulses with an amplitude ratio U2/U1 >1. The end of the common electrode of the CLs is close in profile to an equipotential surface and forms two gaps in the diode. In the first injection gap, at U0 < U1, explosive electron emission starts at the cathode. The pulse U1 arrives here with a delay at least equal to the duration of the leading edge, since there is a dielectric insert in the inner CL. The beam enters, through the window in the intermediate electrode, the acceleration gap, where the leading pulse U2, delivered from the outer CL, has already peaked. In the proposed device, unlike the one-gap prototype diode, electrons start from the cathode at a much smaller spread of the leading edge voltage. As a result, after acceleration of these electrons in the second gap, their energy spread relative to the maximum energy decreases multiply. This is confirmed by calculations and measurements of the beam current for a beam passed through aluminum filters.

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Electromagnetic noise of a nanosecond magnetized high-current electron beam

Cited by 5 publications

References 39 publications

Emission Features and Structure of an Electron Beam versus Gas Pressure and Magnetic Field in a Cold-Cathode Coaxial Diode

Emission Features and Structure of an Electron Beam versus Gas Pressure and Magnetic Field in a Cold-Cathode Coaxial Diode

Multi-pass relativistic traveling-wave tube with simultaneous operation on symmetric and asymmetric modes

A magnetically insulated coaxial vacuum diode providing a reduced energy spread in the leading edge of a high-current electron beam

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