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Title: Pedestal radial flux measuring method to prevent impurity accumulation

Abstract

Use of high-z wall materials attempts to shift the fusion challenge from heat handling to impurity removal. We demonstrate that not only the impurity density in-out asymmetry, but also the poloidal flow, have a major impact on the radial impurity flux direction. The realization provides the first method of measuring the flux from available diagnostics, without the need of a computationally demanding kinetic calculation of the full bulk ion response. Moreover, it affords insight into optimal tokamak operations to avoid impurity accumulation while allowing free fueling. Favorable operation occurs if the temperature is more than twice as steep as the density, and inboard impurity accumulation occurs with poloidal flow in the magnetic field direction.

Authors:
;
Publication Date:
DOE Contract Number:  
FG02-91ER54109
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1880629
DOI:
https://doi.org/10.7910/DVN/DVQ3DA

Citation Formats

Espinosa, S., and Catto, P. J. Pedestal radial flux measuring method to prevent impurity accumulation. United States: N. p., 2019. Web. doi:10.7910/DVN/DVQ3DA.
Espinosa, S., & Catto, P. J. Pedestal radial flux measuring method to prevent impurity accumulation. United States. doi:https://doi.org/10.7910/DVN/DVQ3DA
Espinosa, S., and Catto, P. J. 2019. "Pedestal radial flux measuring method to prevent impurity accumulation". United States. doi:https://doi.org/10.7910/DVN/DVQ3DA. https://www.osti.gov/servlets/purl/1880629. Pub date:Mon Jan 07 00:00:00 EST 2019
@article{osti_1880629,
title = {Pedestal radial flux measuring method to prevent impurity accumulation},
author = {Espinosa, S. and Catto, P. J.},
abstractNote = {Use of high-z wall materials attempts to shift the fusion challenge from heat handling to impurity removal. We demonstrate that not only the impurity density in-out asymmetry, but also the poloidal flow, have a major impact on the radial impurity flux direction. The realization provides the first method of measuring the flux from available diagnostics, without the need of a computationally demanding kinetic calculation of the full bulk ion response. Moreover, it affords insight into optimal tokamak operations to avoid impurity accumulation while allowing free fueling. Favorable operation occurs if the temperature is more than twice as steep as the density, and inboard impurity accumulation occurs with poloidal flow in the magnetic field direction.},
doi = {10.7910/DVN/DVQ3DA},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {1}
}

Works referencing / citing this record:

Pedestal radial flux measuring method to prevent impurity accumulation
journal, May 2017