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Title: Particle Flows in Pumped DIII-D Discharges

Abstract

The dynamics of particle flows in the DIII-D tokamak for two divertor configurations is considered. Fuel and intrinsic carbon impurity flows are analyzed using experimental data and 2D fluid plasma simulations. The flows in puff and pump experiments done in an open and a closed divertor geometry are described. It is shown that the flow of fuel particles is sensitive to divertor geometry. The pumping efficiency of the DIII-D cryopumps is a factor of 2 higher in a closed geometry than an open. The core refueling rate of an open divertor is a factor of 2 higher than that of a closed divertor. In contrast, the flow of impurity carbon particles is insensitive to divertor geometry. Both the core carbon content and the fraction of the carbon source which penetrates to the core is unchanged between an open and closed divertor. In addition, the core impurity content is found to be insensitive to the amplitude of gas puffing in the simulations.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
793991
Report Number(s):
UCRL-JC-136718
Journal ID: ISSN 0022-3115; TRN: US0300662
DOE Contract Number:  
W-7405-Eng-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 290-293; Conference: 14th International Conference on Plasma Surface Interactions (PSI), Rosenheim (DE), 05/22/2000--05/26/2000; Other Information: PBD: 17 May 2000
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 22 GENERAL STUDIES OF NUCLEAR REACTORS; AMPLITUDES; CARBON; CARBON SOURCES; CRYOPUMPS; DIVERTORS; DOUBLET-3 DEVICE; EFFICIENCY; FUEL PARTICLES; GEOMETRY; PLASMA; PLASMA SIMULATION; PUMPING

Citation Formats

Porter, G D, Rognlien, T D, Rensink, M E, Wolf, N, and West, W P. Particle Flows in Pumped DIII-D Discharges. United States: N. p., 2000. Web. doi:10.1016/S0022-3115(00)00448-7.
Porter, G D, Rognlien, T D, Rensink, M E, Wolf, N, & West, W P. Particle Flows in Pumped DIII-D Discharges. United States. doi:10.1016/S0022-3115(00)00448-7.
Porter, G D, Rognlien, T D, Rensink, M E, Wolf, N, and West, W P. Wed . "Particle Flows in Pumped DIII-D Discharges". United States. doi:10.1016/S0022-3115(00)00448-7. https://www.osti.gov/servlets/purl/793991.
@article{osti_793991,
title = {Particle Flows in Pumped DIII-D Discharges},
author = {Porter, G D and Rognlien, T D and Rensink, M E and Wolf, N and West, W P},
abstractNote = {The dynamics of particle flows in the DIII-D tokamak for two divertor configurations is considered. Fuel and intrinsic carbon impurity flows are analyzed using experimental data and 2D fluid plasma simulations. The flows in puff and pump experiments done in an open and a closed divertor geometry are described. It is shown that the flow of fuel particles is sensitive to divertor geometry. The pumping efficiency of the DIII-D cryopumps is a factor of 2 higher in a closed geometry than an open. The core refueling rate of an open divertor is a factor of 2 higher than that of a closed divertor. In contrast, the flow of impurity carbon particles is insensitive to divertor geometry. Both the core carbon content and the fraction of the carbon source which penetrates to the core is unchanged between an open and closed divertor. In addition, the core impurity content is found to be insensitive to the amplitude of gas puffing in the simulations.},
doi = {10.1016/S0022-3115(00)00448-7},
journal = {},
issn = {0022-3115},
number = ,
volume = 290-293,
place = {United States},
year = {2000},
month = {5}
}

Conference:
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