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Current drive and profile control in low aspect ratio tokamaks [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1995.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
4 pages : digital, PDF file
Additional Creators
General Atomic Company, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The key to the theoretically predicted high performance of a low aspect ratio tokamak (LAT) is its ability to operate at very large plasma current*I{sub p}. The plasma current at low aspect ratios follows the approximate formula: I{sub p} ∼ (5a²B{sub t}/Rqψ) [(1 + κ²)/2] [A/(A − 1)] where A {quadruple_bond} R/a which was derived from equilibrium studies. For constant qψ and B{sub t}, I{sub p} can increase by an order of magnitude over the case of tokamaks with A ≳ 2.5. The large current results in a significantly enhanced β{sub t} ({quadruple_bond} β{sub N}I{sub p}/aB{sub t}) possibly of order unity. It also compensates for the reduction in A to maintain the same confinement performance assuming the confinement time τ follows the generic form ∼ HI{sub p}P{sup −1}/²R³/²κ¹/². The initiation and maintenance of such a large current is therefore a key issue for LATs.
Report Numbers
E 1.99:ga-a--22083
E 1.99: conf-950704--7
conf-950704--7
ga-a--22083
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
07/01/1995.
"ga-a--22083"
" conf-950704--7"
"DE95017054"
22. European conference on controlled fusion and plasma physics, Bournemouth (United Kingdom), 2-7 Jul 1995.
Miller, R.L.; Chiu, S.C.; Turnbull, A.D.; Lin-Liu, Y.R.; Chan, V.S.
Funding Information
FG03-95ER54309
View MARC record | catkey: 14744084