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Title: UEDGE and DEGAS modeling of the DIII-D scrape-off layer plasma. Revision 1

Abstract

This paper presents work to develop benchmarked theoretical models of scrape-off-layer (SOL) characteristics in diverted tokamaks by comparing shot simulations using the UEDGE plasma fluid and DEGAS neutral transport codes to measurements of the DIII-D SOL plasma. The experimental data include the radial profiles of n{sub e} T{sub e}, and T{sub i}, the divertor exhaust power, the intensity of H{sub {alpha}} emission, and profiles of the radiated power. A very simple model of the anomalous perpendicular transport rates produces consistency between the calculated and measured radial profiles of the divertor power, and of the midplane densities and temperatures. Experimentally, the measured exhaust power is now 80--90% of the input power. The simulated peak power on the outer leg of the divertor floor is now within 20% of the measured power. Various sensitivities of these comparisons to model assumptions are described. Finally, these benchmarked models have been used to examine the effects of various baffle configurations for the Radiative Divertor Upgrade in DIII-D.

Authors:
; ; ; ; ; ;  [1]; ;  [2]
  1. Lawrence Livermore National Lab., CA (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10126308
Report Number(s):
UCRL-JC-115491-Rev.1; CONF-940580-23-Rev.1
ON: DE95008052;
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 11. international conference on plasma surface interactions in controlled fusion devices,Mito (Japan),23-27 May 1994; Other Information: PBD: May 1994
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DOUBLET-3 DEVICE; PLASMA SCRAPE-OFF LAYER; PLASMA SIMULATION; U CODES; D CODES; DIVERTORS; ELECTRON DENSITY; ELECTRON TEMPERATURE; ION TEMPERATURE; EDGE LOCALIZED MODES; TEMPERATURE DISTRIBUTION; 700420; 700330; PLASMA-FACING COMPONENTS; PLASMA KINETICS, TRANSPORT, AND IMPURITIES

Citation Formats

Fenstermacher, M E, Porter, G D, Rensink, M E, Rognlien, T D, Allen, S L, Hill, D N, Lasnier, C J, Leonard, T, and Petrie, T. UEDGE and DEGAS modeling of the DIII-D scrape-off layer plasma. Revision 1. United States: N. p., 1994. Web.
Fenstermacher, M E, Porter, G D, Rensink, M E, Rognlien, T D, Allen, S L, Hill, D N, Lasnier, C J, Leonard, T, & Petrie, T. UEDGE and DEGAS modeling of the DIII-D scrape-off layer plasma. Revision 1. United States.
Fenstermacher, M E, Porter, G D, Rensink, M E, Rognlien, T D, Allen, S L, Hill, D N, Lasnier, C J, Leonard, T, and Petrie, T. Sun . "UEDGE and DEGAS modeling of the DIII-D scrape-off layer plasma. Revision 1". United States. https://www.osti.gov/servlets/purl/10126308.
@article{osti_10126308,
title = {UEDGE and DEGAS modeling of the DIII-D scrape-off layer plasma. Revision 1},
author = {Fenstermacher, M E and Porter, G D and Rensink, M E and Rognlien, T D and Allen, S L and Hill, D N and Lasnier, C J and Leonard, T and Petrie, T},
abstractNote = {This paper presents work to develop benchmarked theoretical models of scrape-off-layer (SOL) characteristics in diverted tokamaks by comparing shot simulations using the UEDGE plasma fluid and DEGAS neutral transport codes to measurements of the DIII-D SOL plasma. The experimental data include the radial profiles of n{sub e} T{sub e}, and T{sub i}, the divertor exhaust power, the intensity of H{sub {alpha}} emission, and profiles of the radiated power. A very simple model of the anomalous perpendicular transport rates produces consistency between the calculated and measured radial profiles of the divertor power, and of the midplane densities and temperatures. Experimentally, the measured exhaust power is now 80--90% of the input power. The simulated peak power on the outer leg of the divertor floor is now within 20% of the measured power. Various sensitivities of these comparisons to model assumptions are described. Finally, these benchmarked models have been used to examine the effects of various baffle configurations for the Radiative Divertor Upgrade in DIII-D.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {5}
}

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