2019/09/19 by Satadal Das, Das, Satadal, S. K. Karkari +1
Engineering · Materials Science · Physics and Astronomy · #Aerosol Filtration and Electrostatic Precipitation #Dust and Plasma Wave Phenomena #FOS: Physical sciences #High voltage insulation and dielectric phenomena #Magnetic confinement fusion research #Plasma Diagnostics and Applications #Plasma Physics (physics.plasm-ph)
paper · pdf · doi:10.48550/arxiv.1909.08821
openalex publication_date 2019/09/19 · openalex created_date 2022/07/28 · openalex updated_date 2026/07/28
The radial characteristics of plasma potential and density around an\ninsulating disc obstacle, placed inside a partially magnetized plasma flow\ncreated in cylindrical chamber by hot cathode filament are presented. In the\nabsence of obstacle, centrally sharp minima in potential and maxima in plasma\ndensity is observed; however when a macroscopic obstacle is introduced in\nplasma flow, a clear radially off-centred minima in plasma potential is\nobserved having plasma density peaking near the edge of the obstacle. The depth\nof potential around the obstacle depends on the axial magnetic field strength.\nThis off-centred radial potential profile in the plasma flow gives rise to\nfocusing of ions around the obstacle edge. Experimentally it is found that the\ndrift velocity of focused positive ions is directly depended on the magnetic\nfield strength and axial positive ion flow velocity. A phenomenological model\nbased on short-circuiting effect is applied to explain the plasma density and\npotential in the wake region.\n