Generation of anomalously energetic suprathermal electrons by an electron beam interacting with a nonuniform plasma

Sydorenko, Dmytro; Kaganovich, Igor; Chen, L.; Ventzek, Peter L. G.

doi:10.1063/1.4937785

Cited by 18 publications

(14 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The code of EDIPIC is written in Fortran 90 and parallelized with the Message Passing Interface (MPI). It has been used successfully to study the characteristics of plasmas under various conditions, including bounded plasmas [32,33], and species collisions, turbulence, electron emission, etc. In this code, the electron-neutral and ion-neutral collisions are treated with the null collision algorithm [34], while Coulomb collisions between charged particles are treated based on the Langevin model [35].…”

Section: Descriptions On the Simulation Methodsmentioning

confidence: 99%

Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates

Chen

Guo

2019

Plasma Sci. Technol.

View full text Add to dashboard Cite

In this paper, a one-dimension particle-in-cell (PIC) code (EDIPIC) is employed to simulate the parallel-plate ion extraction process under an externally applied electrostatic field, focusing on the analysis of the influence of the initial electron temperature on the extracted ion fluxes to the metal plates during the ion extraction process. Compared with previously published results, the plasma oscillations on a timescale of the electron plasma period, and the excitation of the ion acoustic rarefaction waves resulting from the plasma oscillations originating from both the negative and positive electrodes, are studied for the first time. The modeling results show that both the negative and positive extractors can collect ions due to the plasma oscillations and the propagation of the ion acoustic rarefaction waves. With the increase of the initial electron temperature achieved by keeping other parameters unchanged, on the one hand, both the ion speed and flux to the negative and positive plates increase, which leads to a significant decrease of the ion extraction time, while on the other hand, the ion flux to the positive plate after the formation of a Child-Langmuir sheath is much more sensitive to an increase of the initial electron temperature than that to the negative plate. The PIC simulation results provide a deeper physical understanding of the influence of the initial electron temperature on the characteristics of the entire ion extraction process in a decaying plasma.

show abstract

Section: Descriptions On the Simulation Methodsmentioning

confidence: 99%

Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates

Chen

Guo

2019

Plasma Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The ordinary two-stream instability is similar to the one considered in Ref. 32 and is out of the scope of the present paper.…”

Section: General Properties Of the Global Modementioning

confidence: 62%

“…Simulations with few times lower current and otherwise similar initial state do not reveal this mode, see Ref. 32.…”

Section: Discussionmentioning

confidence: 95%

See 1 more Smart Citation

Excitation of a global plasma mode by an intense electron beam in a dc discharge

et al. 2018

Self Cite

View full text Add to dashboard Cite

Interaction of an intense electron beam with a finite-length, inhomogeneous plasma is investigated numerically. The plasma density profile is maximal in the middle and decays towards the plasma edges. Two regimes of the two-stream instability are observed. In one regime, the frequency of the instability is the plasma frequency at the density maximum and plasma waves are excited in the middle of the plasma. In the other regime, the frequency of the instability matches the local plasma frequency near the edges of the plasma and the intense plasma oscillations occur near plasma boundaries. The latter regime appears sporadically and only for strong electron beam currents. This instability generates copious amount of suprathermal electrons. The energy transfer to suprathermal electrons is the saturation mechanism of the instability.

show abstract

“…В результате дисперсионное уравнение для НПР, во-первых, содержит член, пропорциональный параметру κ i , и, во-вторых, учет электрон-атомных столкновений для электронов пучка и изотропной группы высокоскоростных электронов также приводит к существенным отличиям уравнений (7), (8) от обычно используемых для системы пучок электронов-плазма. В этих уравнениях, как правило, авторы либо не учитывали электрон-атомные столкновения совсем [5,6,[22][23][24][25][26][27][28][29][30][31][32], либо учитывали их только в плазме [14,15,33].…”

Section: заключениеunclassified

Влияние Вида Функции Распределения Электронов В Плазме И Дисперсии По Энергии Электронного Пучка На Устойчивость Низковольтного Пучкового Разряда

Сухомлинов¹,

Матвеев²,

Мустафаев³

et al. 2021

Журнал Технической Физики

View full text Add to dashboard Cite

Within the framework of the kinetic approach, the conditions for the loss of stability of a low-voltage beam discharge in inert gases (LVBD) are studied depending on the temperature of the electron beam, the dispersion of the electron beam velocity in the direction of the discharge axis, and the form of the electron energy distribution function (EEDF). Regimes are considered when the interelectrode distance is on the order of the electron mean free path relative to elastic collisions with inert gas atoms. It is shown that the beam temperature Tb, determined in the LVBD by the cathode temperature not exceeding 1500 K, and the dispersion of the beam electron energy, which in the LVBD can be significantly higher than kTb and reaches 1 - 2 eV, have little effect on the conditions for the loss of stability of the LVBD and the magnitude of the growth rate of disturbance amplification at frequencies up to plasma It was found that the form of the EEDF monotonically decreasing with increasing electron energy also does not affect the parameters of the perturbations propagating in the LVBD at the beam energy much higher than the average electron energy in the plasma. The results obtained are applicable not only to LVBD, but also to other types of self-sustained beam discharges.

show abstract

Generation of anomalously energetic suprathermal electrons by an electron beam interacting with a nonuniform plasma

Cited by 18 publications

References 32 publications

Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates

Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates

Excitation of a global plasma mode by an intense electron beam in a dc discharge

Влияние Вида Функции Распределения Электронов В Плазме И Дисперсии По Энергии Электронного Пучка На Устойчивость Низковольтного Пучкового Разряда

Contact Info

Product

Resources

About