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Title: Effect of Magnetic Geometry on ELM Heat Flux Profiles

Abstract

In this paper we explore how precisely the magnetic up/down symmetry must be controlled to insure sharing of edge localized mode (ELM) heat flux between upper and lower diverters in a double-null tokamak. We show for DIII-D, using infrared thermography, that the spatial distribution of Type-I ELM energy is less strongly affected by variations in magnetic geometry than is the time-averaged peak heat flux in attached discharges. The degree of control necessary to share ELM heat flux deposition equally between diverters was less stringent than the control needed to balance the time averaged heat flux. ELM energy is transported more than four times further into the scrape-off layer than the time-averaged heat flux.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
791721
Report Number(s):
UCRL-JC-139170
Journal ID: ISSN 0022-3115; TRN: US200304%%521
DOE Contract Number:  
W-7405-Eng-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 290-293; Conference: 14th International Plasma Surface Interactions Conference, Rosenheim (DE), 05/22/2000--05/26/2000; Other Information: PBD: 15 May 2000
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; DEPOSITION; EDGE LOCALIZED MODES; GEOMETRY; HEAT FLUX; INFRARED THERMOGRAPHY; PLASMA; SPATIAL DISTRIBUTION; SYMMETRY

Citation Formats

Lasnier, C J, Leonard, A W, Petrie, T W, and Watkins, J G. Effect of Magnetic Geometry on ELM Heat Flux Profiles. United States: N. p., 2000. Web. doi:10.1016/S0022-3115(00)00502-X.
Lasnier, C J, Leonard, A W, Petrie, T W, & Watkins, J G. Effect of Magnetic Geometry on ELM Heat Flux Profiles. United States. doi:10.1016/S0022-3115(00)00502-X.
Lasnier, C J, Leonard, A W, Petrie, T W, and Watkins, J G. Mon . "Effect of Magnetic Geometry on ELM Heat Flux Profiles". United States. doi:10.1016/S0022-3115(00)00502-X. https://www.osti.gov/servlets/purl/791721.
@article{osti_791721,
title = {Effect of Magnetic Geometry on ELM Heat Flux Profiles},
author = {Lasnier, C J and Leonard, A W and Petrie, T W and Watkins, J G},
abstractNote = {In this paper we explore how precisely the magnetic up/down symmetry must be controlled to insure sharing of edge localized mode (ELM) heat flux between upper and lower diverters in a double-null tokamak. We show for DIII-D, using infrared thermography, that the spatial distribution of Type-I ELM energy is less strongly affected by variations in magnetic geometry than is the time-averaged peak heat flux in attached discharges. The degree of control necessary to share ELM heat flux deposition equally between diverters was less stringent than the control needed to balance the time averaged heat flux. ELM energy is transported more than four times further into the scrape-off layer than the time-averaged heat flux.},
doi = {10.1016/S0022-3115(00)00502-X},
journal = {},
issn = {0022-3115},
number = ,
volume = 290-293,
place = {United States},
year = {2000},
month = {5}
}

Conference:
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