Long‐Time Evolution of a Low Pressure Laboratory Plasma after Application of Transient high Voltage Positive Pulses

Choudhary, Mangilal; Kar, Satyananda; Mukherjee, S. K.

doi:10.1002/ctpp.201500146

Cited by 2 publications

(8 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed results can also be understood qualitatively based on the past theoretical and experimental work in the low-pressure hot-filament discharge 3,10,[15][16][17] . Once the disk bias voltage is higher than the plasma potential (V b > V p ), bulk plasma electrons loss rate to the metal disk increases, resulting in increasing the plasma potential.…”

Section: Discussionsupporting

confidence: 54%

“…It is expected to observe the plasma density enhancement if a positively biased (V b > V p ) disk electrode is immersed in the hot-filament helium discharge. Furthermore, the experimental device used in our study 15 was different than the double plasma device 10,11 therefore plasma response to a positively biased auxiliary electrode (disk) should be different than that reported in references [9][10][11] . Some of these open questions motivate us to perform experiments in the hot-filament helium discharge to see the effect of the positively biased auxiliary disk electrode on the plasma characteristics.…”

Section: Introductionmentioning

confidence: 67%

“…The negative value of plasma potential is expected due to the presence of primary energetic electrons (beam electrons) in the plasma volume. At low disk bias voltage, it is difficult to determine the population of these beam electrons but can be possible at large positive bias voltage on the disk electrode 15 . The increase in plasma potential (towards more positive) is expected by removing the confined electrons of the plasma medium 3,11,16 .…”

Section: Resultsmentioning

confidence: 99%

“…In our recent experiment 15 , we observed the plasma density enhancement after application of transient high voltage positive pulses to the axillary disk electrode in low pressure helium plasma. It is expected to observe the plasma density enhancement if a positively biased (V b > V p ) disk electrode is immersed in the hot-filament helium discharge.…”

Section: Introductionmentioning

confidence: 87%

See 3 more Smart Citations

Response of the low pressure hot-filament discharge plasma to a positively biased auxiliary disk electrode

Choudhary,

Sreejith

2021

Preprint

View full text Add to dashboard Cite

In steady-state, the plasma loss rate to the chamber wall is balanced by the ionization rate in the hotfilament discharges. This balance in the loss rate and ionization rate maintains the quasi-neutrality of the bulk plasma. In this report, we have studied the properties of bulk plasma in the presence of an auxiliary (additional) biased metal disk, which is working as a sink, in low-pressure helium plasma. A single Langmuir probe and emissive probe are used to characterize the plasma for various biases (positive and negative) to the metal disk, which was placed along the discharge axis inside the plasma. It is observed that only a positively biased disk increases the plasma potential, electron temperature, and plasma density. Moreover, the plasma parameters remain unaltered when the disk is negatively biased. The observed results for two different-sized positively metal disks are compared with an available theoretical model and found an opposite behavior of plasma density variation with the disk bias voltages at given discharge condition. The role of the primary energetic electron population in determining the plasma parameters is discussed. These experimental results are qualitatively explained on the basis of electrostatic confinement arising due to the loss of electrons to a biased metal disk electrode.

show abstract

Section: Discussionsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 87%

See 2 more Smart Citations

Response of the low pressure hot-filament discharge plasma to a positively biased auxiliary disk electrode

Choudhary,

Sreejith

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Choudhary et al [12] have reported the plasma density enhancement rather than reduction after application of transient high voltage positive pulses to the auxiliary electrode (metal disk) in low pressure hot-filament helium plasma. This study suggests that there should be a plasma density increment instead of reduction which was observed in the double plasma device [11] when a positively biased (V b >V p ) disk electrode is immersed in the hot-filament discharges.…”

Section: Introductionmentioning

confidence: 99%

Response of the low-pressure hot-filament discharge plasma to a positively biased auxiliary disk electrode

Choudhary¹,

Sreejith²

2021

Plasma Sci. Technol.

View full text Add to dashboard Cite

In a steady-state plasma, the loss rate of plasma particles to the chamber wall and surfaces in contact with plasma is balanced by the ionization rate of background neutrals in the hot-filament discharges. The balance between the loss rate and ionization rate of plasma particles (electrons and ions) maintains quasi-neutrality of the bulk plasma. In the presence of an external perturbation, it tries to retain its quasi-neutrality condition. In this work, we studied how the properties of bulk plasma are affected by an external DC potential perturbation. An auxiliary biased metal disk electrode was used to introduce a potential perturbation to the plasma medium. A single Langmuir probe and an emissive probe, placed in the line of the discharge axis, were used for the characterization of the bulk plasma. It is observed that only positive bias to the auxiliary metal disk increases the plasma potential, electron temperature, and plasma density but these plasma parameters remain unaltered when the disk is biased with a negative potential with respect to plasma potential. The observed plasma parameters for two different-sized, positively as well as negatively biased, metal disks are compared and found inconsistent with the existing theoretical model at large positive bias voltages. The role of the primary energetic electrons population in determining the plasma parameters is discussed. The experimentally observed results are qualitatively explained on the basis of electrostatic confinement arising due to the loss of electrons to a biased metal disk electrode.

show abstract

Long‐Time Evolution of a Low Pressure Laboratory Plasma after Application of Transient high Voltage Positive Pulses

Cited by 2 publications

References 24 publications

Response of the low pressure hot-filament discharge plasma to a positively biased auxiliary disk electrode

Response of the low pressure hot-filament discharge plasma to a positively biased auxiliary disk electrode

Response of the low-pressure hot-filament discharge plasma to a positively biased auxiliary disk electrode

Contact Info

Product

Resources

About