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ITER edge-plasma conditions versus pump configuration [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
23 pages : digital, PDF file
Additional Creators
Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Two-dimensional fluid simulations of ITER double-null divertor scrape-off-layer plasma conditions have been restricted to examining a single outboard divertor plate with up/down symmetry assumed. The present work evaluates the effect of pumping at only one plate on particle flow patterns and other parameters of interest. Pumping only at one plate results in reduced sheath temperatures at both plates but an increased heat flux at the pumped plate. The physics assumptions for separatrix density (n{sub SEP}={l_angle}n{r_angle}/3.5) and for radial particle diffusivity (D=0.66m²/s) used in the simulation of ITER edge plasma result in particle throughputs two orders of magnitude greater than that required for acceptable fusion-product ash removal rates. The particle confinement time, however, is an order of magnitude shorter than the transport energy confinement time, τ{sub E}. Plasmas (D=0.04m²/s) which would have τ{sub p} ∼ τ{sub E} are evaluated and found to have unacceptably high plasma temperatures and heat flux at the plate. Ash removal rates are still acceptable. A plasma recycle coefficient of R=0.965 reduces the particle throughput by a factor of 2.8 below the no-recycle case.
Report Numbers
E 1.99:la-ur--91-4080
E 1.99: conf-920311--1
conf-920311--1
la-ur--91-4080
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
12/11/1991.
"la-ur--91-4080"
" conf-920311--1"
"DE92005053"
10. international conference on plasma-surface interactions in controlled fusion devices,Monterey, CA (United States),30 Mar - 3 Apr 1992.
Cohen, S.A.; Werley, K.A.
Funding Information
W-7405-ENG-36
AC02-76CH03073
View MARC record | catkey: 14745138