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Naturally occurring electric current spatial profiles were measured at high spatial resolution by a probe array installed in the Joint European Torus (JET) Mk1 divertor target. Very narrow current layers near the separatrix strike point on the divertor target were observed. The current flow directions in the narrow layers changed with toroidal field direction. The currents do not behave like previously identified thermoelectric currents. A plasma plus neutral quasisingle fluid magnetohydrodynamic (MHD) model is developed to represent adequately the scrapeoff layer (SOL) equilibrium all the way through the divertor recycle zone and sheath to the target. The model shows that SOL Pfirsch-Schlüter current passes through these zones relatively unattenuated and is measureable by target mounted probes. The observed new current features are consistent with being SOL Pfirsch-Schlüter current is reduced by divertor plasma detachment from the target are briefly discussed.

Additional information

Authors: SCHAFFER M J, General Atomics, San Diego (US);CHANKIN A V, JET Joint Undertaking, Abingdon, Oxon. (GB);GUO H-Y, JET Joint Undertaking, Abingdon, Oxon. (GB);MATTHEWS G F, JET Joint Undertaking, Abingdon, Oxon. (GB);MONK R, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(96)11 EN (1996) 26pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199610692 / Last updated on: 1996-06-21
Original language: en
Available languages: en
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