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Achieving high fusion reactivity in high poloidal beta discharges in TFTR [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (17 pages) : digital, PDF file
Additional Creators
Princeton University, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
High poloidal beta discharges have been produced in TFTR that achieved high fusion reactivities at low plasma currents. By rapidly decreasing the plasma current just prior to high-power neutral beam injection, relatively peaked current profiles were created having high l[sub i] > 2, high Troyon-normalized beta, [beta]N > 3, and high poloidal beta. [beta][sub p] [ge] 0.7 R/a. The global energy confinement time after the current ramp was comparable to supershots, and the combination of improved MHD stability and good confinement produced a new high [epsilon][beta][sub p] high Q[sub DD] operating mode for TFTR. Without steady-state current profile control, as the pulse lengths of high [beta]p discharges were extended, l[sub i] decreased, and the improved stability produced immediately after by the current ramp deteriorated. In four second, high [epsilon][beta][sub p] discharges, the current profile broadened under the influence of bootstrap and beam-drive currents. When the calculated voltage throughout the plasma nearly vanished, MHD instabilities were observed with [beta][sub N] as low as 1.4. Ideal MHD stability calculations showed this lower beta limit to be consistent with theoretical expectations.
Report Numbers
E 1.99:pppl-2896
E 1.99: iaea-cn--56/a-iii-4
E 1.99: conf-9210315--4
conf-9210315--4
iaea-cn--56/a-iii-4
pppl-2896
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
04/01/1993.
"pppl-2896"
" iaea-cn--56/a-iii-4"
" conf-9210315--4"
"DE93011980"
14. international conference on plasma physics and controlled nuclear fusion research, Wurzburg (Germany), Oct 1992.
Bell, R.; Bell, M.G.; Mueller, D.; Owen; Janos, A.C.; Manuel, M.E.; Cheng, C.Z.; McCune, D.C.; Fu, G.Y.; Budny, R.V.; Bush, C.E.; Fredrickson, E.D.; Medley, S.S.; Efthimion, P.C.; Hawryluk, R.J.; Jassby, D.L.; Chance, M.S.; Batha, S.; Levinton, F.; Manickam, J.; Mikkelsen, D.R.; Sabbagh, S.A. . Dept. of Applied Physics; Navratil, G.A.; McGuire, K.M.; Cavallo, A.; Nagayama, Y.
Funding Information
AC02-76CH03073
FG02-90ER54084
FG02-89ER53297
View MARC record | catkey: 14747080