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Operating conditions of the BPX divertor [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
Pages: (5 pages) : digital, PDF file
Additional Creators
Lawrence Livermore National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
In this paper we discuss the expected operating conditions at the divertor of the BPX tokamak (Burning Plasma Experiment), the next- step US tokamak proposed for the study of self-heated plasmas at Q {approx equal} 5 to ignition. In this double-null device (κ {approx equal} 2), the predicted first-wall loading is high because of is compact size (R = 2.6m, α = 0.8m, I{sup p} = 10.6 MA, and B{sub T}) and its high projected fusion power output (100--500 MW with up to 20 MW of ICRH). Present designs call for inertially cooled carbon-based target plate material and X-point sweeping to handle the divertor heat flux during the 3--5 s flat-top at full power. The X-point is maintained about 15--20 cm off the target plates (a distance of ∼5m along field lines), which represents a reasonable compromise between lowering the divertor electron temperature (T{sub e,d}) by increasing the connection length, and lowering the peak divertor heat flux ({cflx q}{sub d}) by increasing the magnetic flux expansion (which is about 15--20 in this case). It is planned for the BPX device to operate with H-mode confinement; ELMs are expected because of the relatively high power flow through the edge plasma (P{sub sep} {approx equal} 0.6 MW/m² for P{sub fus} = 500 MW). The ELMs will help reduce the impurity concentration in the core plasma (Z{sub eff} {approx equal} 1.7) and keep the density down, but should not add significantly to the divertor heat flux since their measured contribution to the global power balance drops with increasing input power.
Report Numbers
E 1.99:ucrl-jc-105946
E 1.99: conf-910609--20
conf-910609--20
ucrl-jc-105946
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1991.
"ucrl-jc-105946"
" conf-910609--20"
"DE91015675"
International conference on systems analysis in water quality management, Berlin (Germany), 3-7 Jun 1991.
Campbell, R.; Brooks, J.N.; Hill, D.N.; Haines, J.; Rognlien, T.; Milovich, J.; Prinja, A.; Ulrickson, M.; Stotler, D.P.; Braams, B.J.; Knoll, D.
Funding Information
W-7405-ENG-48
AC02-76CH03073
View MARC record | catkey: 14748424