Effect on the divertor and scrape-off layer plasma properties of the distribution of power and particle influxes from the core

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Title: Effect on the divertor and scrape-off layer plasma properties of the distribution of power and particle influxes from the core
Author: Stacey, Weston M.
Abstract: Calculations of the profiles along the field lines within the divertor and scrape-off layer (SOL) of differences in the plasma ion density, temperature, parallel current, parallel flow velocity, and electrostatic potential, which result from using different poloidal distributions of the particle and heat influxes crossing the separatrix from the core plasma into the SOL, are presented and discussed vis-à-vis experimental observations. The calculations show that the stronger outboard than inboard particle and heat fluxes into the SOL caused by the geometric compression/expansion of flux surfaces predicted by magnetohydrodynamic equilibrium calculations lead to a prediction of higher plasma temperature at the outboard divertor than at the inboard divertor, a result that is consistent with experimental observation and that confirms a previous prediction (made without accounting for drifts) of a possible cause of the observed in-out divertor power asymmetry. The calculations also illustrate the effect of the poloidal distribution of particle and power influx into the SOL on the flow velocity, parallel current, and electrostatic potential distributions in the SOL and divertor.
Description: © 2009 American Institute of Physics. The electronic version of this article is the complete one and can be found online at: http://link.aip.org/link/PHPAEN/v16/i3/p032506/s1 DOI: 10.1063/1.3094856
Type: Article
URI: http://hdl.handle.net/1853/33410
ISSN: 1070-664X
Citation: W. M. Stacey, "Effect on the divertor and scrape-off layer plasma properties of the distribution of power and particle influxes from the core," Physics of Plasmas, 16 (2009) 032506
Date: 2009-03-25
Contributor: Georgia Institute of Technology. School of Physics
Georgia Institute of Technology. Fusion Research Center
Publisher: Georgia Institute of Technology
American Institute of Physics
Subject: Divertors
Ion density
Plasma boundary layers
Plasma density
Plasma magnetohydrodynamics
Plasma temperature

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