Sheath Structure in Electronegative Plasma Having Cold Ions: An Impact of Negative Ions’ Mass

Malik, Hitendra K.; Dhawan, Rajat

doi:10.1109/tps.2020.2998717

Cited by 9 publications

(7 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, the electric potential distribution is obtained from Poisson's equation, as given by Equation (17).…”

Section: Modelmentioning

confidence: 99%

“…The volume negative ions play an important role in processing plasmas and also in the negative ion sources. [ 12–17 ]…”

Section: Introductionmentioning

confidence: 99%

“…The volume negative ions play an important role in processing plasmas and also in the negative ion sources. [12][13][14][15][16][17] The electronegative plasma sheath under different conditions has already been widely explored. [18][19][20][21][22][23] However, with the advent of fusion research, interest has grown to study the electronegative sheath with negative ion emitting wall.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Plasma sheath with multi‐species of positive ions and surface produced negative ions

Samanta

Moulick

Bhuyan

et al. 2023

Contrib. Plasma Phys

View full text Add to dashboard Cite

The structure of a plasma sheath has been investigated in front of a caesium‐coated metallic plate, using a simple theoretical model. Along with the electrons, the plasma is composed of multi‐species of positive ions, and surface and volume produced negative ions. While the volume produced negative ions are common in many plasma processing chambers, the surface produced negative ions are of critical importance, especially to the Neutral Beam Injection (NBI) systems. The surface negative ions are produced via the coated metallic plate. With a single species of positive ion, the Bohm criterion, which determines the sheath edge potential, is multi‐valued for a specific range of electronegativity (). The width of the multi‐valued region has been reported to increase with the surface production yield (). Calculations are done for hydrogen plasma with a slight admixture of a second gas such as argon. Besides discussing the differences brought in by the mere presence of a second ion, the paper highlights the importance of the positive ion current density in determining the Bohm criterion. In addition, the effect of three species of positive ions in the surface production process has been discussed.

show abstract

“…Finally, the electric potential distribution is obtained from Poisson's equation, as given by Equation (17).…”

Section: Modelmentioning

confidence: 99%

“…The volume negative ions play an important role in processing plasmas and also in the negative ion sources. [ 12–17 ]…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Plasma sheath with multi‐species of positive ions and surface produced negative ions

Samanta

Moulick

Bhuyan

et al. 2023

Contrib. Plasma Phys

View full text Add to dashboard Cite

show abstract

“…For the last several decades, plasma sheath problems have been extensively analysed using kinetic [1][2][3][4][5][6][7][8][9][10][11] and fluid [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] models. Tonks and Langmuir [1] were the first to consider the sheath in gas discharges, with cold ions and hot electrons, and solved the mystery of higher ion velocity in the sheath than the respective thermal velocity in the bulk plasma.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Dhawan and coworkers analysed the sheath formation with different conditions in warm electronegative plasmas using a fluid description. [12][13][14][15][16][17] The fluid and numerical description of supersonic ion flow at sheath entrance were discussed in Refs. [18][19][20][21], but kinetic analysis of a sheath with supersonic ion flow is very rare.…”

Section: Introductionmentioning

confidence: 99%

Plasma sheath in the presence of warm ions

Din

Adnan

Khan

2023

Contributions to Plasma Physics

View full text Add to dashboard Cite

The numerical solution of a warm ion sheath for an electrode/wall in contact with a low‐density isotropic plasma is analysed for sonic and supersonic flow of ions at the sheath entrance. For this, we consider half Maxwellian electron and water bag ion velocity distribution functions at the sheath edge. The generalized kinetic Bohm criterion is used to calculate the average ion velocity at the sheath edge. A relation between electrode/wall floating potential, sheath edge potential, and ion temperature is derived from the floating electrode/wall condition. The numerical solution of potential profiles for sonic and supersonic ions is calculated with varying ion temperature at different values of sheath edge potential. The results show that for sonic ions, the sheath solution merges smoothly into presehath solution, but for supersonic ions, we have density gradients, which increase with increasing ion temperature.

show abstract

Diagnostic of laser wakefield acceleration with ultra – Short laser pulse by using SMILEI PIC code

Kumar

Dhawan

Singh

et al. 2022

Materials Today: Proceedings

View full text Add to dashboard Cite

Sheath Structure in Electronegative Plasma Having Cold Ions: An Impact of Negative Ions’ Mass

Cited by 9 publications

References 58 publications

Plasma sheath with multi‐species of positive ions and surface produced negative ions

Plasma sheath with multi‐species of positive ions and surface produced negative ions

Plasma sheath in the presence of warm ions

Diagnostic of laser wakefield acceleration with ultra – Short laser pulse by using SMILEI PIC code

Contact Info

Product

Resources

About