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approvedsherwood_2018_stacey_word.pdf2018-05-07 07:56:08Weston Stacey


Author: Weston M. Stacey
Requested Type: Poster
Submitted: 2018-02-21 11:58:04


Contact Info:
Georgia Tech
220 State St
Atlanta, Georgia   30332

Abstract Text:
This paper examines the role that the kinetic ion orbit loss of the outflowing thermalized plasma ions and the compensating inward thermalized ion current required for charge neutrality could play in creating the rather unique structure of the radial electric field in tokamak edge plasmas. Differences in this electric field are observed to be associated with significantly different plasma confinement. The basic physical mechanisms considered are the establishment from ions and neutral atoms incoming to the edge plasma from the scrape-off layer and divertor a compensating inward radial current of ions in the edge plasma to offset ion orbit loss and maintain charge neutrality, and the consequential resetting of the edge radial electric field to maintain momentum balance in the presence of such ion currents. The resulting theory is compared qualitatively with experimental measurements.

Plasma Edge Physics