Valid flow combinations for stable sheath in a magnetized multiple ion species plasma

Journal Article · Thu Nov 15 04:00:00 EST 2012 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4768428· OSTI ID:22068930

Sharma, Devendra; Kaw, Predhiman K ^[1]

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1. Institute for Plasma Research, Bhat, Gandhinagar 382428 (India)

Theoretical study is done of the entry criterion for the plasma flow into the electrostatic boundary layer, or sheath, forming in a magnetized multiple ion species plasma. Finding valid entry velocity combinations in a magnetized set up requires a magnetized equivalent of the generalized Bohm criterion. A magnetized generalized entry criterion is obtained with the scale length distribution in a region of validity for the stable solutions. The analysis finds that the valid entry flow velocity combinations with distinct values of individual ion species can correspond to a unique system phase velocity. Magnetization effects govern the region of validity whose boundaries collapse to the unmagnetized sheath criterion in the limit of normal incidence, independent of the strength of the magnetic field. Considerably smaller entry velocities, in comparison to the unmagnetized system sound velocity, are recovered for the species in appropriate regime of magnetization in the cases of oblique incidences.

• OSTI ID: 22068930
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 19; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOHM CRITERION
BOUNDARY LAYERS
IONS
MAGNETIC FIELDS
MAGNETIZATION
MATHEMATICAL SOLUTIONS
PHASE VELOCITY
PLASMA
PLASMA SHEATH
SOUND WAVES