Thermal ion orbit loss and radial electric field in DIII-D

A relatively simple model for the generation of the radial electric field, Er, near the outboard boundary in a tokamak is presented. The model posits that Er is established to supply the return current necessary to balance the thermal ion orbit loss current. Comparison with DIII-D data is promising....

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Bibliographic Details
Published in:Physics of plasmas 2015-08, Vol.22 (8)
Main Authors: deGrassie, J. S., Boedo, J. A., Grierson, B. A.
Format: Article
Language:English
Subjects:
Electric fields
Ion temperature
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Tokamak devices
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Summary:A relatively simple model for the generation of the radial electric field, Er, near the outboard boundary in a tokamak is presented. The model posits that Er is established to supply the return current necessary to balance the thermal ion orbit loss current. Comparison with DIII-D data is promising. Features of the model that promote a more negative edge Er are higher ion temperature, lower density, lower impurity ion content, and a shorter pathlength for orbit loss. These scalings are consistent with experimentally established access to the high-confinement mode edge transport barrier.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4928558