Application of a hybrid model for the numerical study of the generation of runaway electrons and the formation of high-pressure gas discharge

Lisenkov, V. V.; Mamontov, Yu. I.

doi:10.1088/1742-6596/1141/1/012051

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…This difference is due to at the initial stage the avalanche development occurs in the inhomogeneous field near the microprotrusion. Earlier, such a situation was described by us in [82]. It should be noted that the avalanche characteristics correspond to the time moment of the RAE arriving at the anode.…”

Section: Numerical Simulationmentioning

confidence: 81%

“…It was also analytically shown [79] that, at pressures up to 10 atm in a discharge gap with a uniform electric field distribution, running away of electrons is possible in the region of an enhanced electric field near a microprotrusion on the cathode surface. Later, we approved the method of numerical calculations in the enhanced electric field domain near the microprotrusion using the Monte-Carlo approach [80][81][82][83].…”

Section: Resultsmentioning

confidence: 99%

“…We used a 3D PIC-MCC C++ code developed by us. The block diagram of the code is given in [82]. The code considered electron energy gain during electron motion between collisions and losses due to inelastic collisions.…”

Section: Numerical Simulationmentioning

confidence: 99%

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Streak investigations of the dynamics of subnanosecond discharge developing in nitrogen at a pressure of 6 atm with the participation of runaway electrons

Ivanov¹,

Lisenkov²,

Mamontov³

2021

Plasma Sources Sci. Technol.

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The results of an investigation of a self-sustained subnanosecond discharge in nitrogen at a pressure of 6 atm are presented. A high voltage pulse with a front of approximately 770 ps at the level of 0.1-0.9 in amplitude was applied to the studied gas gap. In this case, the voltage rise rate in the discharge gap at the prebreakdown stage was 1.45 × 10 14 V s −1 . A breakdown occurs at the end of the front of the voltage pulse. The cathode geometry used provided a 3.3-fold enhancement of an electric field in the near-cathode spatial domain. It is shown that at the initial stage the discharge is of a volumetric form which turns into a spark form further. The discharge contraction starts from a cathode and an anode almost simultaneously. The propagation rate of ionization waves accompanying the spark channel development is 4.2 × 10 8 cm s −1 . The initial volumetric form of the discharge is provided by preliminary ionization of a gas medium by runaway electrons. The generation of runaway electrons takes place in the enhanced electric field area formed near a microprotrusion on the cathode surface, while the macro-geometry of the discharge gap does not ensure enhancing of the electric field up to the value which is sufficient to the implementation of the runaway electron generation criterion. Numerical simulation of a formation process of the electron avalanche initiated by an electron field-emitted from the top of the cathode microprotrusion was carried out taking into account the motion of each electron in the avalanche. To simulate electron motion through the discharge gap, the 3D Monte-Carlo technique was employed. The following runaway electron parameters were calculated: characteristic runaway electron trajectories; runaway electron energy gained during the motion through the discharge gap; and times required for runaway electrons to reach the anode.

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Section: Numerical Simulationmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

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Streak investigations of the dynamics of subnanosecond discharge developing in nitrogen at a pressure of 6 atm with the participation of runaway electrons

Ivanov¹,

Lisenkov²,

Mamontov³

2021

Plasma Sources Sci. Technol.

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“…Аналитическая модель, описывающая подобный механизм, изложена в [7,30], но непосредственное ее применение в настоящих расчетах невозможно, поскольку она использует ряд приближений, не выполняющихся в условиях настоящей работы и, как следствие, не позволяющих провести точный расчет. Поэтому в настоящей работе использована гибридная модель, представленная в [31]. В этой модели размножение электронов в области усиления электрического поля вблизи микроострия рассчитывалось моделированием их движения и столкновений методом Монте−Карло.…”

Section: Introductionunclassified

“…В работе [32] показано, что при давлениях выше 10 atm электроны могут уходить в режим убегания непосредственно с вершины микроострия при напряженности электрического поля в межэлектродном промежутке, равной 820 kV/cm. В работе [31] показано, что такая напряженность поля может реализовываться в самом начале формирования катодного слоя, что может дать старт анодонаправленому стримерному каналу, приводящему к контракции объемного разряда. С другой стороны, при отсутствии предварительной ионизации убегающие электроны могут ее обеспечить (правда, неоднородно) и привести к зажиганию разряда на короткое время в объемной форме перед его контракцией.…”

Section: Introductionunclassified

Численное Исследование Возможности Генерации Убегающих Электронов В Формирующемся Катодном Слое Самостоятельного Объемного Разряда Высокого Давления

Лисенков¹

2020

Журнал Технической Физики

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Calculations of the formation of the cathode layer of an self-sustained high-pressure volume discharge with pre-ionization of the gas medium excited by nano-and subnanosecond voltage pulses are carried out. It is shown that at pressures of ~ 1 atm at the final stage of the cathode layer formation, conditions for the generation of escaping electrons arise. We also considered the transition of electrons into runaway mode from the area of electric field amplification in front of the plasma (streamer) channel, which originates from the top of the micro-spike on the cathode. It is shown that at pressures of ~ 10 atm, electrons can transfer into runaway mode immediately after emission from the top of micro-spike in amplified electric field. Thus obtained runaway electrons can create pre-ionization of the gaseous medium and provide the formation of the initial phase of the discharge in volume form in the system without external pre-ionization.

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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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Application of a hybrid model for the numerical study of the generation of runaway electrons and the formation of high-pressure gas discharge

Cited by 8 publications

References 10 publications

Streak investigations of the dynamics of subnanosecond discharge developing in nitrogen at a pressure of 6 atm with the participation of runaway electrons

Streak investigations of the dynamics of subnanosecond discharge developing in nitrogen at a pressure of 6 atm with the participation of runaway electrons

Численное Исследование Возможности Генерации Убегающих Электронов В Формирующемся Катодном Слое Самостоятельного Объемного Разряда Высокого Давления

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

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