Photoemission driven electron two-stream instability (ETSI) and evolution of plasma sheath

Changmai, Suniti; Bora, Madhurjya P.

doi:10.1063/1.5081928

Cited by 8 publications

(8 citation statements)

References 26 publications

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“…For a detailed description of the PIC model, the reader can refer to some excellent monographs and review articles available elsewhere 25 , 32 . The following description is also detailed in one of our earlier papers 33 . It is well known that the PIC algorithm uses computational macro-particles (also known as super-particles) instead of real particles, so that the distribution function for each species is a superposition of several computational macro-particles 33 – 35 , where the superscript p denotes the attribute of the computational particles.…”

Section: Appendix: Computational Detailsmentioning

confidence: 99%

“…The following description is also detailed in one of our earlier papers 33 . It is well known that the PIC algorithm uses computational macro-particles (also known as super-particles) instead of real particles, so that the distribution function for each species is a superposition of several computational macro-particles 33 – 35 , where the superscript p denotes the attribute of the computational particles. The particle distribution function can be defined as, where are the shape functions of the computational particles and is the number of computational particles.…”

Section: Appendix: Computational Detailsmentioning

confidence: 99%

Section: Appendix: Computational Detailsmentioning

confidence: 99%

“…We adopt the cloud-in-cell (CIC) linear weighting scheme in order to interpolate the charge from the particle positions on to the grid points 23 , 33 . A schematic representation of the scheme is shown in Fig.…”

Section: Appendix: Computational Detailsmentioning

confidence: 99%

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Particle-in-cell simulation of the effect of dust charge fluctuation on ion acoustic waves in a dusty plasma

Changmai

Bora

2020

Sci Rep

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A new hybrid-particle-in-cell (PIC)-Monte Carlo Collision (h-PIC-MCC) algorithm is presented here. The code correctly simulates the damping of ion acoustic wave due to dust charge fluctuation in a dusty plasma along with other kinetic effects such as Landau damping. In the model, on event of a collision between a charged particle and a dust particle, a randomised probability determines whether the charged particle is absorbed by the dust with the collision cross section being determined dynamically by the overall interaction scenario. We find that this method is versatile enough as it can also include the size and mass distribution for the dust particles, in addition to the charged species dynamics. As such, it can be adopted to study numerous phenomena that occur in diverse dusty plasma environments. We believe that the damping of the ion acoustic wave through dust charge fluctuation is being demonstrated, for the first time, with a PIC code, in this work.

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Section: Appendix: Computational Detailsmentioning

confidence: 99%

Section: Appendix: Computational Detailsmentioning

confidence: 99%

Section: Appendix: Computational Detailsmentioning

confidence: 99%

Section: Appendix: Computational Detailsmentioning

confidence: 99%

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Particle-in-cell simulation of the effect of dust charge fluctuation on ion acoustic waves in a dusty plasma

Changmai

Bora

2020

Sci Rep

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“…Deduced expressions between two types of RF plasma are given in Table I. 32,42,43 , thermionic emission 26,29,44 and photoemission [45][46][47] . In boundaries of many RF-heated plasma systems, ion flux is damaging, e.g.…”

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confidence: 99%

Intense boundary emission destroys normal radio-frequency plasma sheath

Sun

Zhang

2020

Phys. Rev. E

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Current models of capacitively coupled plasma indicate that external bias is mainly consumed by oscillating sheathes which shield external field. We report first evidence that strong boundary emission destroys normal radio-frequency (RF) sheath and establishes a new RF plasma where external bias is consumed by bulk plasma instead of sheathes. This produces ion confinement and intense RF current in bulk plasma, combined with unique particle and energy balance. Proposed model offers new method for ion erosion mitigation, wave mode conversion and a reaction rate control technic in low pressure plasma processing.A capacitively coupled plasma (CCP) is naturally formed by applying radio-frequency (RF) voltage to electrodes. Understanding RF plasma properties is of fundamental interests and is essential in numerous applications 1-7 . Contemporary models of CCP discharge assume that the bulk plasma is well isolated from the boundaries by oscillating sheathes and applied bias mainly rests on sheathes instead of bulk plasma. Conduction current prevails displacement current in bulk plasma and field in bulk plasma is weak. But in this letter we will show that the bias can be primarily consumed by bulk plasma and electric field in plasma center needs not to be shielded by sheathes, due to intense boundary emission.Numerous studies have been done regarding boundary emission in CCP, but its influences are mostly assumed to be unessential 4,[8][9][10][11][12][13][14][15] . The steady flux of ion produces a surface emission flux = due to ion-induced secondary electron emission (SEE), with the emission coefficient. Under low pressure, secondary electrons (SEs) are lost before remarkable ionizations occur and their impact is less significant than that of hot electrons generated by stochastic heating 16 . Higher pressure incurs transition to γ mode where particle balance is modified by ionizations of SEs 10 . Yet the structure of plasma, i.e. bulk plasma connected by Bohm presheath and Child-law sheath, is supposed to be untouched and mean wall potential remains negative relative to plasma 17-21 .In this letter, we show that boundary emission can bring very strong disturbance and restructure entire RF plasma, which happens when is greater than averaged plasma electron flux 〈 〉 . It is well known that a space-charge limited (SCL) sheath is formed if > near floating boundary, such as thermionic emitter, emissive probe, Hall thruster, etc [22][23][24] . In this case, normal Child-law sheath still presents between plasma and the potential dip called virtual cathode (VC) near boundary, so dynamics of plasma are not essentially modified 25 . Recent works reported that a floating SCL sheath can become unstable due to cold ion trapping 26,27 . But no one has studied a RF plasma with intense boundary emission. Below we shall first show with simulation how RF plasma properties behave *

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Secondary electron emission and collisional effects in a two‐electron temperature plasma sheath

Sharma

Paul

Deka

et al. 2023

Contributions to Plasma Physics

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The effects of secondary electron emission from the surface of a material that is in direct contact with a plasma containing two different electron groups have been investigated based on the hydro‐dynamic sheath model. The two‐electron groups present in the system have distinct densities and temperatures. They are described by the non‐extensive distribution function, whereas cold ions are assumed to be fluid elements. In addition, the effect of ion‐neutral collision has also been taken into account. The study reveals that the electron non‐extensivity has a significant effect on the secondary electron population as well as space charge deposition near the wall. The results obtained from the study will provide a better understanding of the plasma‐wall transition region under an electron‐emitting condition.

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Photoemission driven electron two-stream instability (ETSI) and evolution of plasma sheath

Cited by 8 publications

References 26 publications

Particle-in-cell simulation of the effect of dust charge fluctuation on ion acoustic waves in a dusty plasma

Particle-in-cell simulation of the effect of dust charge fluctuation on ion acoustic waves in a dusty plasma

Intense boundary emission destroys normal radio-frequency plasma sheath

Secondary electron emission and collisional effects in a two‐electron temperature plasma sheath

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