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Title: Far Scrape-Off Layer and Near Wall Plasma Studies in DIII-D

Abstract

Far scrape-off layer (SOL) plasma parameters in DIII-D depend strongly on the discharge density and confinement regime. In L-mode, cross-field transport increases with the average discharge density and elevates the far SOL density, thus increasing plasma-wall contact. Far SOL density near the low field side (LFS) of the main chamber wall also increases with decreasing plasma current and with decreasing outer wall gap. In H-mode, between edge localized modes (ELMs), plasma-wall contact is weaker than in L-mode. During ELMs plasma fluxes to the LFS wall increase to, or above the L-mode levels. A large fraction of the net cross-field fluxes is convected through the SOL by large amplitude intermittent transport events. In high density L-mode and during ELMs in H-mode, intermittent events propagate all the way to the LFS wall and may cause sputtering.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15011795
Report Number(s):
UCRL-CONF-208424
Journal ID: ISSN 0022-3115; TRN: US0501445
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 337-339; Conference: Presented at: 16th International Conference on Plasma Surface Interactions, Portland, ME (US), 05/24/2004--05/28/2004; Other Information: PBD: 3 Dec 2004
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; CONFINEMENT; DOUBLET-3 DEVICE; EDGE LOCALIZED MODES; ELECTRIC CURRENTS; PLASMA; SOLS; SPUTTERING; TRANSPORT

Citation Formats

Rudakov, D, Boedo, J, Moyer, R, Brooks, N, Doerner, R, Evans, T, Fenstermacher, M, Groth, M, Hollmann, E, Krashennijov, S, Lasnier, C, Mahdavi, M, McKee, G, McLean, A, Stangeby, P, Wampler, W, Watkins, J, West, W, Whyte, D, and Wong, C. Far Scrape-Off Layer and Near Wall Plasma Studies in DIII-D. United States: N. p., 2004. Web. doi:10.1016/j.jnucmat.2004.10.094.
Rudakov, D, Boedo, J, Moyer, R, Brooks, N, Doerner, R, Evans, T, Fenstermacher, M, Groth, M, Hollmann, E, Krashennijov, S, Lasnier, C, Mahdavi, M, McKee, G, McLean, A, Stangeby, P, Wampler, W, Watkins, J, West, W, Whyte, D, & Wong, C. Far Scrape-Off Layer and Near Wall Plasma Studies in DIII-D. United States. https://doi.org/10.1016/j.jnucmat.2004.10.094
Rudakov, D, Boedo, J, Moyer, R, Brooks, N, Doerner, R, Evans, T, Fenstermacher, M, Groth, M, Hollmann, E, Krashennijov, S, Lasnier, C, Mahdavi, M, McKee, G, McLean, A, Stangeby, P, Wampler, W, Watkins, J, West, W, Whyte, D, and Wong, C. 2004. "Far Scrape-Off Layer and Near Wall Plasma Studies in DIII-D". United States. https://doi.org/10.1016/j.jnucmat.2004.10.094. https://www.osti.gov/servlets/purl/15011795.
@article{osti_15011795,
title = {Far Scrape-Off Layer and Near Wall Plasma Studies in DIII-D},
author = {Rudakov, D and Boedo, J and Moyer, R and Brooks, N and Doerner, R and Evans, T and Fenstermacher, M and Groth, M and Hollmann, E and Krashennijov, S and Lasnier, C and Mahdavi, M and McKee, G and McLean, A and Stangeby, P and Wampler, W and Watkins, J and West, W and Whyte, D and Wong, C},
abstractNote = {Far scrape-off layer (SOL) plasma parameters in DIII-D depend strongly on the discharge density and confinement regime. In L-mode, cross-field transport increases with the average discharge density and elevates the far SOL density, thus increasing plasma-wall contact. Far SOL density near the low field side (LFS) of the main chamber wall also increases with decreasing plasma current and with decreasing outer wall gap. In H-mode, between edge localized modes (ELMs), plasma-wall contact is weaker than in L-mode. During ELMs plasma fluxes to the LFS wall increase to, or above the L-mode levels. A large fraction of the net cross-field fluxes is convected through the SOL by large amplitude intermittent transport events. In high density L-mode and during ELMs in H-mode, intermittent events propagate all the way to the LFS wall and may cause sputtering.},
doi = {10.1016/j.jnucmat.2004.10.094},
url = {https://www.osti.gov/biblio/15011795}, journal = {},
issn = {0022-3115},
number = ,
volume = 337-339,
place = {United States},
year = {Fri Dec 03 00:00:00 EST 2004},
month = {Fri Dec 03 00:00:00 EST 2004}
}

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Works referenced in this record:

Comments on particle and energy balance in the edge plasma of Alcator C-Mod
journal, September 1998


Particle transport in the scrape-off layer and its relationship to discharge density limit in Alcator C-Mod
journal, May 2001


Transport by intermittent convection in the boundary of the DIII-D tokamak
journal, November 2001


Fluctuation-driven transport in the DIII-D boundary
journal, May 2002


Transport by intermittency in the boundary of the DIII-D tokamak
journal, May 2003


Edge transport and its interconnection with main chamber recycling in ASDEX Upgrade
journal, June 2003


Edge localized modes and fluctuations in the JET SOL region
journal, August 2003


On scrape off layer plasma transport
journal, May 2001


Edge turbulence imaging in the Alcator C-Mod tokamak
journal, May 2002