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

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

doi:10.3390/electronics11020248

Cited by 7 publications

(2 citation statements)

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“…[21,22]. As shown in recent works [23][24][25], focusing of RAEs by a magnetic field makes it possible to reach a current density of tens to hundreds of amperes per square centimeter at the anode of the atmospheric discharge gap, which is comparable to the capabilities of vacuum explosive-emission sources of electrons and gives prospects for expanding the practical applications of the RAE beams.…”

Section: Introductionmentioning

confidence: 94%

Features of Electron Runaway in a Gas Diode with a Blade Cathode

2022

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Conditions for electron runaway in a gas diode with a blade cathode providing a strongly inhomogeneous distribution of the electric field in the interelectrode gap have been studied theoretically. It has been demonstrated that the character of electron runaway differs qualitatively for cathodes with a different rounding radius of the edges. In the case of a relatively large edge radius (tens of microns or more), the conditions for the transition of electrons to the runaway mode are local in nature: they are determined by the field distribution in the immediate vicinity of the cathode where the electrons originate from. Here, the relative contribution of the braking force acting on electrons in a dense gas reaches a maximum. This behavior is generally similar to the behavior of electrons in a uniform field. For a cathode with a highly sharpened edge, the relative contribution of the braking force is maximum in the near-anode region. As a consequence, the runaway condition acquires a nonlocal character: it is determined by the electron dynamics in the entire interelectrode gap.

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Section: Introductionmentioning

confidence: 94%

Features of Electron Runaway in a Gas Diode with a Blade Cathode

2022

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“…At present, the research team from the IEP continues to conduct experimental and theoretical investigations of the RAEs in collaboration with researchers from the P.N. Lebedev Physical Institute of the Russian Academy of Sciences (LPI) [38][39][40]. The fourth scientific group [41,42] that started to investigate the RAE in collaboration with the HCEI [43][44][45][46][47] is the T. Shao research group from the Institute of Electrical Engineering (IEE) of the Chinese Academy of Sciences.…”

Section: Introductionmentioning

confidence: 99%

Optimal Conditions for the Generation of Runaway Electrons in High-Pressure Gases

Kozyrev,

Tarasenko

2024

Plasma

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Runaway electron (RAE) generation in high-pressure gases is an important physical phenomenon that significantly influences discharge shapes and properties of initiated plasma. The diffuse discharges formed due to RAEs in the air and other gases at atmospheric pressure find wide applications. In the present review, theoretical and experimental results that explain the reason for RAE occurrence at high pressures are analyzed, and recommendations are given for the implementation of conditions under which the runaway electron beam (RAEB) with the highest current can be obtained at atmospheric pressure. The experimental results were obtained using subnanosecond, nanosecond, and submicrosecond generators, including those specially developed for runaway electron generation. The RAEBs were recorded using oscilloscopes and collectors with picosecond time resolution. To theoretically describe the phenomenon of continuous electron acceleration, the method of physical kinetics was 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. The 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 the research presented here allow RAE 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, five sections, the Conclusion, and the References.

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