Investigation of the switching characteristics of high-pressure subnanosecond gas dischargers with the purpose of a sharp increasing of the breakdown voltages and the switching speed

Ivanov, Stepan N

doi:10.1088/1361-6595/ac6693

Cited by 7 publications

(1 citation statement)

References 71 publications

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“…Скорость УЭ становится сопоставимой со скоростью света, в результате чего они пересекают газовый промежуток длиной в единицы-десятки миллиметров за десяткисотни пикосекунд. За эти времена УЭ осуществляют предварительную ионизацию промежутка, инициируя тем самым его пробой в субнаносекундном временном диапазоне [19,[22][23][24][25][26] (см. также [6,16,[27][28][29][30][31][32][33]).…”

Section: Introductionunclassified

Убегающие Электроны В Газовом Диоде С Клиновидным Катодом

Зубарев,

Зубарева,

Яландин

2023

Журнал Технической Физики

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The features of electron runaway in a gas diode with a wedge-shaped cathode providing a sharply inhomogeneous distribution of the electric field in the interelectrode gap are studied. It is shown that the character and conditions of runaway are qualitatively different for wedges with relatively large and small opening angles, i.e., in fact, for different degrees of field inhomogeneity. In the first case, the transition to the runaway mode is determined by the behavior of electrons in the immediate vicinity of their starting point, the vertex of the wedge-shaped cathode. For a wedge close in shape to a blade (opening angle less than 30 degrees), the relative contribution of the braking force for electrons in the gas increases with distance from the cathode, and their behavior at the periphery, near the anode, begins to play a key role in the analysis of runaway conditions. The influence of an external magnetic field on the geometry of the ionized region near the wedge vertex, starting from which the electrons become runaways, is also discussed.

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Section: Introductionunclassified

Убегающие Электроны В Газовом Диоде С Клиновидным Катодом

Зубарев,

Зубарева,

Яландин

2023

Журнал Технической Физики

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Investigation of the possibility of generation of runaway electrons in subnanosecond gas discharges of high and ultrahigh pressure in the vicinity of microprotrusions on the cathode surface

Ivanov,

Lisenkov

2024

Physics of Plasmas

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In the pressure range of 1–40 atm, experimental and theoretical studies of the processes of initiation and development dynamics of the initial stage of the self-sustained subnanosecond discharge in nitrogen, developing in a uniform electric field with the participation of runaway electrons, were carried out. Data on the maximum achievable values of the electric field strength in the discharge gap at the pre-breakdown stage of the discharge development and photographs of the microrelief of the surface of a stainless steel cathode formed during its training by subnanosecond high-voltage pulses were obtained. These data served as the basis for numerical 3D modeling of the development of an electron avalanche initiated by a field emission electron in a small region of enhanced electric field near a microinhomogeneity on the cathode. The possibility of transition of electrons in these avalanches to the runaway regime was studied. Cone-shaped microprotrusions, metal drops, and boundaries between pores and microcraters were considered as microinhomogeneities. It has been shown that the initial energy obtained by an electron near the microinhomogeneity can significantly facilitate its transfer into the runaway regime. This effect is especially noticeable at gas pressures higher 10 atm. As a result, at the stage of a self-sustained subnanosecond discharge formation, the runaway mode of an electron can be realized at the average reduced electric field strengths in the discharge gap, which are significantly lower than required by the runaway criterion.

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Methodology for measuring the energy characteristics of two-electrode gas discharge plasma switches in the picosecond range using the reflectometry method

Ivanov,

Lisenkov

2024

Physics of Plasmas

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This research proposes a new technique for measuring the energy characteristics (losses of energy in the spark gap, related to light radiation, ionization, excitation, and heating of the working gas during the development of plasma; discharge power) of two-electrode gas dischargers in the subnanosecond range. The work examines the voltage waveforms across the discharge gas gap and the discharge current waveform obtained by the reflectometry method in the subnanosecond range. To do this, the traditional technique for measuring such characteristics was modified. This allows us to restore the back edge of the voltage pulse across the discharge gap at the breakdown delay and the breakdown stages, which is usually lost in the subnanosecond range when measuring such waveforms. For modification, calculated data on the ionization frequency were used. This allows us to replace the plasma of the discharge gap with a constant resistor in those sections of the voltage waveform where the characteristic ionization time is more than an order of magnitude longer than the duration of the voltage pulse applied to the gap. The waveforms of the voltage across the discharge gap and the discharge current obtained in this way allowed us to calculate the power dynamics and total energy introduced into the gas discharge plasma. These parameters are important both for calculating the efficiency of gas switches and for other applications of gas discharge plasma, in particular laser pumping.

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Investigation of the switching characteristics of high-pressure subnanosecond gas dischargers with the purpose of a sharp increasing of the breakdown voltages and the switching speed

Cited by 7 publications

References 71 publications

Убегающие Электроны В Газовом Диоде С Клиновидным Катодом

Убегающие Электроны В Газовом Диоде С Клиновидным Катодом

Investigation of the possibility of generation of runaway electrons in subnanosecond gas discharges of high and ultrahigh pressure in the vicinity of microprotrusions on the cathode surface

Methodology for measuring the energy characteristics of two-electrode gas discharge plasma switches in the picosecond range using the reflectometry method

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