Bulletin of ANPA

Abstract submitted to ANPA Conference July 14–16, 2023

Volume 5, Number 1

Atomic, Molecular, Optical and Plasma Physics
Abstract ID: ANPA2023-N00021

Abstract:

ANPA2023-N00021: Ion flow and dust charging at the sheath boundary for dusty plasma with electron emitting surface: Applications to laboratory and lunar dusty plasmas

Authors:

  • Suresh Basnet; Tribhuvan University
  • Amit Patel; Government Science College, Gujarat University, Gandhinagar, Gujarat 382016, India
  • Shiva Bikram Thapa; Central Department of Physics, Tribhuvan University, Kirtipur, Kathmandu 44613, Nepal
  • Raju Khanal; Central Department of Physics, Tribhuvan University, Kirtipur, Kathmandu 44613, Nepal

In laboratory and space plasmas, the emission of electrons from the surface significantly affects the characteristics of plasma sheath formed at that surface, which is crucial to understanding the overall plasma-wall interaction mechanism. In this work, the collisional fluid model is used for laboratory dusty plasma, whereas collisionless model is used for lunar dusty plasma. We have extended the Bohm sheath criterion for the formation of stable plasma sheath in account of electron emission from the surface, loss of ion flux, and gas pressure for the collisional laboratory dusty plasmas. It is found that ion flow at the sheath boundary is considerably influenced by the concentration of electron emission, ion loss term, and gas pressure. The equilibrium evolution of dust charge explicitly determines the magnitude of ion flow at the sheath boundary. The plasma parameters adopted in the present case are reliable in laboratory and space dusty plasmas, especially dusty plasma environment on the lunar surface. The surface of Moon and dust grains are electrically charged due to interaction of solar-wind plasma and photoemission electrons from the surface due to solar ultra-violet radiation. In addition, the plasma sheath characteristics, dust charging process, and stable dust levitation on the sheath region have been studied.

To cite this abstract, use the following reference: https://anpaglobal.org/conference/2023/ANPA2023-N00021