An Ultra-Short Dense Paraxial Bunch of Sub-Relativistic Runaway Electrons

Mesyats, G.; Osipenko, Elizaveta A.; Sharypov, K. A.; Shpak, V. G.; Shunaĭlov, S. A.; Yalandin, M. I.; Зубарев, Н. М.

doi:10.1109/led.2022.3155173

Cited by 22 publications

(13 citation statements)

References 29 publications

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“…In this paper, using the results of recent experimental work [2], we have established that the radial size of the magnetized RAE beam at the anode is determined by the process of diffusion of fast electrons across the magnetic field lines with the classical scaling D ~ 1/B 2 . In this case, the relation r0.9 ~ D 1/2 ~ 1/B is valid for the beam radius.…”

Section: Discussionmentioning

confidence: 99%

“…In experiments [2], a subnanosecond voltage pulse with amplitude of -155 kV was applied to the conical cathode (cone angle of 40 o and tip rounding radius of about 50 µm). RAEs were emitted at the front of the voltage pulse, when the potential difference U between the anode and cathode (30 mm gap) was ≈ 80 kV.…”

Section: Experimental Data and Preliminary Estimatesmentioning

confidence: 99%

“…Let the function ρ(r,t) give radial distribution of the RAE bunch charge. Its relation with the recorded in experiments charge Q(r) that passes through collimator hole of radius r (see details in [2]) is given by…”

Section: Dependence Of the Beam Radius On The Magnetic Fieldmentioning

confidence: 99%

“…It has been recently shown [2] that the RAE flow divergence in the air-filled discharge gap with a conical cathode can be reduced by using a guiding axial magnetic field. This made it possible for the first time to form RAE bunches of comparable axial and radial sizes of several millimeters.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Runaway electrons in an air gap in the presence of a magnetic field

Mamontov¹,

Mesyats²,

Sharypov³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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The divergence of the runaway electron flow generated in an air-filled discharge gap with a sharp conical cathode can be essentially reduced by applying a guiding axial magnetic field, which opens up prospects for the practical use of formed dense paraxial bunches of fast electrons. In the present work, we consider factors that determine the radial scale of the bunch. Our analysis shows that the main factor is the diffusion of electrons across the magnetic field lines due to collisions with gas molecules. Calculations of the dependence of the runaway electron beam radius on the magnitude of the applied magnetic field, taking this phenomenon into account, agree with the experimental data.

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Section: Discussionmentioning

confidence: 99%

Section: Experimental Data and Preliminary Estimatesmentioning

confidence: 99%

Section: Dependence Of the Beam Radius On The Magnetic Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Runaway electrons in an air gap in the presence of a magnetic field

Mamontov¹,

Mesyats²,

Sharypov³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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show abstract

“…All this has allowed the researchers to obtain experimentally the main laws of changes in the RAEB parameters attendant to changes of the amplitude and voltage pulse front as well as the pulse shape, cathode and gas diode designs, gas type and pressure, voltage pulse repetition frequency of the generator, and its life time. The registered RAEB pulse durations were analyzed in Chapter 7 of work [112] and in works [31,40,95,97]. Data on the RAE bremsstrahlung and characteristic x-rays were obtained (see collective monographs [32,109,112]).…”

Section: Generators Cathodes and Collectors For Forming And Measuring...mentioning

confidence: 99%

Optimal Conditions for Generation of Runaway Electrons in High Pressure Gases

Tarasenko

2023

Preprint

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Runaway electrons (RAEs) generation in high-pressure gases is an important physical phenomenon that influences significantly discharge shapes and properties of initiated plasma. The diffuse discharges formed due to RAEs in air and other gases at atmospheric pressure find wide application. In the present review, theoretical and experimental results that explain the reason for the RAEs occurrence at high pressures are analyzed and recommendations are given on the implementation of conditions under which the runaway electron beam (RAEB) with the highest current can be obtained at atmospheric pressure. Experimental results were obtained using subnanosecond, nanosecond, and submicrosecond generators, including those specially developed for runaway electron generation. The RAEB were recorded by oscilloscopes and collectors with picosecond time resolution. To describe theoretically the phenomenon of continuous electron acceleration, the method of physical kinetics has been used based on the Boltzmann kinetic equation that takes into account the minimum but sufficient number of elementary processes, including shock gas ionization and elastic electron scattering. Results of modeling allowed the main factors to be established that control the RAE appearance, the most important of which is electron scattering on neutral atoms and/or molecules. Theoretical modeling has allowed the influence of various parameters (including the voltage, pressure, gas type, and geometrical characteristics of the discharge gap) to be taken into account. The results of research presented here allow the RAEs accelerators with desirable parameters to be developed and the possibility of obtaining diffuse discharges to be accessed under various conditions. The review consists of the Introduction, 5 Sections, the Conclusion, and the References.

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Combined generator–accelerator scheme for high-gradient electrons acceleration by Ka-band subnanosecond superradiant pulses

et al. 2022

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An increase in the accelerating gradient in hollow metal structures powered by an RF field is associated with the development of sources of high-power short-pulse high-frequency radiation. To date, the most powerful (multi gigawatts) nanosecond-scale microwave pulses are produced based on the effect of Cherenkov super-radiance (SR). We consider the possibility of experimental observation of high-gradient acceleration of electrons by Ka-band SR pulses in a combined generator–accelerator scheme with two coaxial electron beams formed by a single cathode. The outer tubular beam is used to generate the SR pulse in periodical slow-wave structure, while the inner one is accelerated in a “pill-box” resonator. The main parameters of the proposed scheme are determined based on full-scale particle-in-cell simulations, according to which accelerating gradient can reach 400 MV/m as some fraction of electrons passing the resonator increases energy from 250 keV to 1.85 MeV. Using the obtained data, injector of the coaxial beams and the sensor of accelerated electrons are developed and tested.

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An Ultra-Short Dense Paraxial Bunch of Sub-Relativistic Runaway Electrons

Cited by 22 publications

References 29 publications

Runaway electrons in an air gap in the presence of a magnetic field

Runaway electrons in an air gap in the presence of a magnetic field

Optimal Conditions for Generation of Runaway Electrons in High Pressure Gases

Combined generator–accelerator scheme for high-gradient electrons acceleration by Ka-band subnanosecond superradiant pulses

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