The ion velocity (Bohm--Chodura) boundary condition at the entrance to the magnetic presheath in the presence of diamagnetic and {bold E}{times}{bold B} drifts in the scrape-off layer

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871421· OSTI ID:165022

Stangeby, P C ^[1]; Chankin, A V ^[2]

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1. University of Toronto Institute for Aerospace Studies, Ontario, M3H 5T6 (Canada)
2. JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (United Kingdom)

In the absence of drifts, the Bohm--Chodura criterion gives that the fluid velocity parallel to the magnetic field reaches the ion acoustic speed at the entrance to the magnetic presheath. The changes to this criterion are derived for the situation where poloidal {ital E}{times}{ital B} drifts are present. (It was shown earlier that diamagnetic drifts do not influence this criterion.) Here {ital E}{times}{ital B} drifts can cause the parallel fluid velocity at the magnetic presheath entrance to become supersonic, subsonic, or reversed (negative). {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• OSTI ID: 165022
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 2; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOHM CRITERION
BOUNDARY CONDITIONS
DIAMAGNETISM
DIVERTORS
MAGNETIC FIELDS
PLASMA DRIFT
PLASMA SCRAPE-OFF LAYER
PLASMA SHEATH
SUBSONIC FLOW
SUPERSONIC FLOW