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Title: CORRELATION OF H-MODE BARRIER WIDTH AND NEUTRAL PENETRATION LENGTH

Abstract

OAK A271 CORRELATION OF H-MODE BARRIER WIDTH AND NEUTRAL PENETRATION LENGTH. Pedestal studies in DIII-D find a good correlation between the width of the H-mode density barrier and the neutral penetration length. These results are obtained by comparing experimental density profiles to the predictions of an analytic model for the profile, obtained from the particle continuity equations for electrons and deuterium atoms. In its range of validity (edge temperature between 40-500 eV), the analytic model quantitatively predicts the observed decrease of the width as the pedestal density increases, the observed strong increase of the gradient of the density as the pedestal density increases and the observation that L-mode and H-mode profiles with the same pedestal density have very similar shapes. The width of the density barrier, measured from the edge of the electron temperature barrier, is the lower limit for the observed width of the temperature barrier. These results support the hypothesis that particle fueling provides the dominant control for the size of the H-mode transport barrier.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
GENERAL ATOMICS (US)
Sponsoring Org.:
(US)
OSTI Identifier:
813666
DOE Contract Number:  
AC03-99ER54463
Resource Type:
Conference
Resource Relation:
Conference: THIS IS A PREPRINT OF A PAPER TO BE PRESENTED AT THE 19TH IAEA FUSION ENERGY CONFERENCE, LYON (FR), 10/14/2002--10/19/2002; Other Information: PBD: 1 Sep 2002
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ATOMS; CONTINUITY EQUATIONS; DEUTERIUM; DOUBLET-3 DEVICE; ELECTRON TEMPERATURE; ELECTRONS; HYPOTHESIS; IAEA; THERMONUCLEAR REACTORS; TRANSPORT

Citation Formats

GROEBNER,RJ, MAHDAVI,MA, LEONARD,AW, OSBORNE,TH, WOLF,NS, PORTER,GD, STANGEBY,PC, BROOKS,NH, COLCHIN,RJ, HEIDBRINK,WW, LUCE,TC, MCKEE,GR, OWEN,LW, WANG,G, and WHYTE,DG. CORRELATION OF H-MODE BARRIER WIDTH AND NEUTRAL PENETRATION LENGTH. United States: N. p., 2002. Web.
GROEBNER,RJ, MAHDAVI,MA, LEONARD,AW, OSBORNE,TH, WOLF,NS, PORTER,GD, STANGEBY,PC, BROOKS,NH, COLCHIN,RJ, HEIDBRINK,WW, LUCE,TC, MCKEE,GR, OWEN,LW, WANG,G, & WHYTE,DG. CORRELATION OF H-MODE BARRIER WIDTH AND NEUTRAL PENETRATION LENGTH. United States.
GROEBNER,RJ, MAHDAVI,MA, LEONARD,AW, OSBORNE,TH, WOLF,NS, PORTER,GD, STANGEBY,PC, BROOKS,NH, COLCHIN,RJ, HEIDBRINK,WW, LUCE,TC, MCKEE,GR, OWEN,LW, WANG,G, and WHYTE,DG. Sun . "CORRELATION OF H-MODE BARRIER WIDTH AND NEUTRAL PENETRATION LENGTH". United States. doi:. https://www.osti.gov/servlets/purl/813666.
@article{osti_813666,
title = {CORRELATION OF H-MODE BARRIER WIDTH AND NEUTRAL PENETRATION LENGTH},
author = {GROEBNER,RJ and MAHDAVI,MA and LEONARD,AW and OSBORNE,TH and WOLF,NS and PORTER,GD and STANGEBY,PC and BROOKS,NH and COLCHIN,RJ and HEIDBRINK,WW and LUCE,TC and MCKEE,GR and OWEN,LW and WANG,G and WHYTE,DG},
abstractNote = {OAK A271 CORRELATION OF H-MODE BARRIER WIDTH AND NEUTRAL PENETRATION LENGTH. Pedestal studies in DIII-D find a good correlation between the width of the H-mode density barrier and the neutral penetration length. These results are obtained by comparing experimental density profiles to the predictions of an analytic model for the profile, obtained from the particle continuity equations for electrons and deuterium atoms. In its range of validity (edge temperature between 40-500 eV), the analytic model quantitatively predicts the observed decrease of the width as the pedestal density increases, the observed strong increase of the gradient of the density as the pedestal density increases and the observation that L-mode and H-mode profiles with the same pedestal density have very similar shapes. The width of the density barrier, measured from the edge of the electron temperature barrier, is the lower limit for the observed width of the temperature barrier. These results support the hypothesis that particle fueling provides the dominant control for the size of the H-mode transport barrier.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 2002},
month = {Sun Sep 01 00:00:00 EDT 2002}
}

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