Numerical investigation of secondary electron emission effect on the dusty plasma sheath with superextensive electrons

2020 ◽  
Vol 27 (8) ◽  
pp. 083701
Author(s):  
O. El Ghani ◽  
I. Driouch ◽  
H. Chatei
Keyword(s):  
Numerical Investigation ◽  
Dusty Plasma ◽  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Plasma Sheath ◽  
Emission Effect

Jean's instability in a drifting dusty plasma in the presence of secondary electron emission

2010 ◽  
Vol 81 (2) ◽  
pp. 025504 ◽  
Author(s):  
Susmita Sarkar ◽  
Saumyen Maity ◽  
B Roy ◽  
Manoranjan Khan
Keyword(s):  
Dusty Plasma ◽  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission

Stability of different plasma sheaths near a dielectric wall with secondary electron emission

2019 ◽  
Vol 85 (6) ◽  
Author(s):  
Shaowei Qing ◽  
Jianguo Wei ◽  
Wen Chen ◽  
Shengli Tang ◽  
Xiaogang Wang
Keyword(s):  
Electron Emission ◽  
Secondary Electron ◽  
Collisionless Plasma ◽  
Secondary Electron Emission ◽  
Plasma Sheath ◽  
Dielectric Wall ◽  
Maxwellian Plasma ◽  
Wide Range ◽  
Plasma Sheaths ◽  
Sheath Structure

The linear theory stability of different collisionless plasma sheath structures, including the classic sheath, inverse sheath and space-charge limited (SCL) sheath, is investigated as a typical eigenvalue problem. The three background plasma sheaths formed between a Maxwellian plasma source and a dielectric wall with a fully self-consistent secondary electron emission condition are solved by recent developed 1D3V (one-dimensional space and three-dimensional velocities), steady-state, collisionless kinetic sheath model, within a wide range of Maxwellian plasma electron temperature $T_{e}$ . Then, the eigenvalue equations of sheath plasma fluctuations through the three sheaths are numerically solved, and the corresponding damping and growth rates $\unicode[STIX]{x1D6FE}$ are found: (i) under the classic sheath structure (i.e. $T_{e}<T_{ec}$ (the first threshold)), there are three damping solutions (i.e. $\unicode[STIX]{x1D6FE}_{1}$ , $\unicode[STIX]{x1D6FE}_{2}$ and $\unicode[STIX]{x1D6FE}_{3}$ , $0>\unicode[STIX]{x1D6FE}_{1}>\unicode[STIX]{x1D6FE}_{2}>\unicode[STIX]{x1D6FE}_{3}$ ) for most cases, but there is only one growth-rate solution $\unicode[STIX]{x1D6FE}$ when $T_{e}\rightarrow T_{ec}$ due to the inhomogeneity of sheath being very weak; (ii) under the inverse sheath structure, which arises when $T_{e}>T_{ec}$ , there are no background ions in the sheath so that the fluctuations are stable; (iii) under the SCL sheath conditions (i.e. $T_{e}\geqslant T_{e\text{SCL}}$ , the second threshold), the obvious ion streaming through the sheath region again emerges and the three damping solutions are again found.

Effect of secondary electron emission on the propagation of dust acoustic waves in a dusty plasma

2004 ◽  
Vol 11 (5) ◽  
pp. 1850-1859 ◽  
Author(s):  
M. R. Gupta ◽  
Susmita Sarkar ◽  
Banamali Roy ◽  
Anupam Karmakar ◽  
Manoranjan Khan
Keyword(s):  
Dusty Plasma ◽  
Electron Emission ◽  
Acoustic Waves ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Dust Acoustic Waves ◽  
Dust Acoustic

Surface effects in a capacitive argon discharge in the intermediate pressure regime

2021 ◽  
Author(s):  
Jon Tomas Gudmundsson ◽  
Janez Krek ◽  
De-Qi Wen ◽  
Emi Kawamura ◽  
Michael A Lieberman
Keyword(s):  
Excited States ◽  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Plasma Sheath ◽  
Secondary Electrons ◽  
Particle In Cell ◽  
Argon Discharge ◽  
Discharge Operation ◽  
Ion Impact

Abstract One-dimensional particle-in-cell/Monte Carlo collisional (PIC/MCC) simulations are performed on a capacitive 2.54 cm gap, 1.6 Torr argon discharge driven by a sinusoidal rf current density amplitude of 50 A/m2 at 13.56 MHz. The excited argon states (metastable levels, resonance levels, and the 4p manifold) are modeled self-consistently with the particle dynamics as space- and time-varying fluids. Four cases are examined, including and neglecting excited states, and using either a fixed or energy-dependent secondary electron emission yield due to ion and/or neutral impact on the electrodes. The results for all cases show that most of the ionization occurs near the plasma-sheath interfaces, with little ionization within the plasma bulk region. Without excited states, secondary electrons emitted from the electrodes are found to play a strong role in the ionization process. When the excited states, secondary electron emission due to neutral and ion impact on the electrodes are included in the discharge model, the discharge operation transitions from α-mode to γ-mode, in which nearly all the ionization is due to secondary electrons. Excited states are very effective in producing secondary electrons, with approximately 14.7 times the contribution of ion bombardment. Electron impact of ground state argon atoms by secondary electrons contributes about 76 % of the total ionization; primary electrons, about 11 %; metastable Penning ionization, about 13 %; and multi-step ionization, about 0.3 %.

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