Experimental study of charging of dust grains in the presence of energetic electrons

Paul, Rupali; Sharma, Gainda L.; Deka, K.; Adhikari, S.; Moulick, R.; Kausik, S. S.; Saikia, B. K.

doi:10.1088/1361-6587/ac44e5

Cited by 6 publications

(12 citation statements)

References 32 publications

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“…5. It shows that in the presence of dust grains, there is a significant rise in the density of the cold component of electrons in a two-electron temperature plasma due to the secondary electron emissions from the dust, caused by the electron group with higher temperature [28,40]. Besides this, the electron temperature does not change significantly.…”

Section: Resultsmentioning

confidence: 92%

“…For those plasmas containing hot electrons as the dominant group, the IAWs acts as a suitable diagnostic tool to determine the presence of cold electrons [15]. Moreover, dust charging study in a two-electron temperature plasma has revealed secondary electron emissions (SEE) from Tungsten (W) dust grains [28]. The study shows that the SEE from the dust grains results in an increase in the density of cold electrons, which is expected to have a significant effect on the propagation of IAWs.…”

Section: Introductionmentioning

confidence: 99%

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Effect of external magnetic field and dust grains on the properties of Ion Acoustic Waves

Deka¹,

Paul²,

Sharma³

et al. 2022

Preprint

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An experimental study to investigate the effect of an external magnetic field on the propagation of ion-acoustic waves (IAWs) has been carried out in hydrogen plasma containing two-temperature electrons and dust grains. A low-pressure hot cathode discharge method is opted for plasma production. The desired two electron groups with distinct temperatures are achieved by inserting two magnetic cages with a cusp-shaped magnetic field of different surface field strengths in the same chamber. The dust grains are dropped into the plasma with the help of a dust dropper, which gain negative charges by interacting with the plasma. The IAWs are excited with the help of a mesh-grid inserted into the plasma. A planar Langmuir probe is used as a detector to detect the IAWs. The time of flight technique has been applied to measure the phase velocity of the IAWs. The results suggest that in the presence of a magnetic field, the phase velocity of IAWs increases, whereas introducing the dust particles leads to the lower phase velocity. The magnetic field is believed to have a significant effect on the wave damping. This study will aid in utilising IAWs as a diagnostic tool to estimate plasma parameters in the presence of an external magnetic field. Moreover, the study might be useful for estimating the relative ion concentrations in a two positive ion species plasma, as well as the relative concentration of the negative ions in the presence of an external magnetic field.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effect of external magnetic field and dust grains on the properties of Ion Acoustic Waves

Deka¹,

Paul²,

Sharma³

et al. 2022

Preprint

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show abstract

“…The field also guides the primary electrons from the filaments towards the junction of the two cages. Therefore, the total electron flux increases significantly at the centre, and consequently, the probability of interaction of these energetic electrons with the dust grains increases, which leads to a sufficient number of secondary electrons emitted from the dust grains (Paul et al 2022).…”

Section: Variation Of Phase Velocity Of Iawsmentioning

confidence: 99%

“…For those plasmas containing hot electrons as the dominant group, the IAWs acts as a suitable diagnostic tool to determine the presence of cold electrons (Jones et al 1975). Moreover, dust charging study in a two-electron temperature plasma has revealed secondary electron emissions (SEE) from tungsten dust grains (Paul et al 2022). The study shows that the SEE from the dust grains results in an increase in the density of cold electrons, which is expected to have a significant effect on the propagation of IAWs.…”

Section: Introductionmentioning

confidence: 99%

Effect of external magnetic field and dust grains on the properties of ion-acoustic waves

Deka,

Paul,

Sharma

et al. 2023

J. Plasma Phys.

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An experimental study to investigate the effect of an external magnetic field on the propagation of ion-acoustic waves (IAWs) has been carried out in hydrogen plasma containing two-temperature electrons and dust grains. It is a first step in understanding the propagation properties of IAWs in such an environment. A low-pressure hot cathode discharge method is chosen for plasma production. The desired two-electron groups with distinct temperatures are achieved by inserting two magnetic cages with a cusp-shaped magnetic field of different surface field strengths in the same chamber. The dust grains are dropped into the plasma with the help of a dust dropper, which gain negative charges by interacting with the plasma. The IAWs are excited with the help of a mesh grid inserted into the plasma. A planar Langmuir probe is used as a detector to detect the IAWs. The time-of-flight technique has been applied to measure the phase velocity of the IAWs. The results suggest that in the presence of a magnetic field, the phase velocity of IAWs increases, whereas introducing the dust particles leads to the lower phase velocity. The magnetic field is believed to have a significant effect on the wave damping. This study will aid in utilising IAWs as a diagnostic tool to estimate plasma parameters in the presence of an external magnetic field.

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“…However, their presence has a profound effect on the plasma dynamics. [7,8] In the edge region of the fusion devices, the energetic electrons are often generated by lower hybrid resonance or electron cyclotron heating. These electrons have a considerable impact on the energy transport to the plasma-facing wall.…”

Section: Introductionmentioning

confidence: 99%

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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Experimental study of charging of dust grains in the presence of energetic electrons

Cited by 6 publications

References 32 publications

Effect of external magnetic field and dust grains on the properties of Ion Acoustic Waves

Effect of external magnetic field and dust grains on the properties of Ion Acoustic Waves

Effect of external magnetic field and dust grains on the properties of ion-acoustic waves

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

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