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Title LONG-PULSE, HIGH-PERFORMANCE DISCHARGES IN THE DIII-D TOKAMAK
Creator/Author T.C. LUCE ; M.R. WADE ; P.A. POLITZER ; S.L. ALLEN ; M E. AUSTIN ; D.R. BAKER ; B.D. BRAY ; D.P. BRENNAN ; K.H. BURRELL ; T.A. CASPER ; M.S. CHU ; J.D. De BOO ; E.J. DOYLE ; J.R. FERRON ; A.M. GAROFALO ; P.GOHIL ; I.A. GORELOV ; C.M. GREENFIELD ; R.J. GROEBNER ; W.W. HEIBRINK ; C.-L. HSIEH ; A.W. HYATT ; R.JAYAKUMAR ; J.E.KINSEY ; R.J. LA HAYE ; L.L.LAO ; C.J.LASNIER ; E.A. LAZARUS ; A.W. LEONARD ; Y.R.LIN-LIU ; J.LOHR ; M.A. MAKOWSKI ; M.MURAKAMI ; C.C.PETTY ; R.I. PINSKER ; R.PRATER ; C.L. RETTIG ; T.L. RHODES ; B.W. RICE ; E.J. STRAIT ; T.S. TAYLOR ; D.M. THOMAS ; A.D. TURNBULL ; J.G. WATKINS ; W.P.WEST ; K.-L. WONG
Publication Date2000 Oct 01
OSTI IdentifierOSTI ID: 805800
DOE Contract NumberAC03-99ER54463
Other Number(s)TRN: US200309%%116
Resource TypeConference
Resource RelationConference: 18th IAEA Fusion Energy Conference, Sorrento (IT), 10/04/2000--10/10/2000; Other Information: THIS IS A PREPRINT OF A PAPER TO BE PRESENTED AT THE 18TH IAEA FUSION ENERGY CONFERENCE, OCTOBER 4-10,2000 IN SORRENTO, ITALY, AND TO BE PUBLISHED IN THE ''PROCEEDINGS''; PBD: 1 Oct 2000
Research OrgGENERAL ATOMICS (US)
Sponsoring Org(US)
Subject43 PARTICLE ACCELERATORS; CONFINEMENT; CONFINEMENT TIME; CURRENT DENSITY; CYCLOTRONS; DOUBLET-3 DEVICE; ELECTRONS; HEATING SYSTEMS; IAEA; PERFORMANCE; RELAXATION TIME; THERMONUCLEAR REACTORS
Description/AbstractSignificant progress in obtaining high performance discharges for many energy confinement times in the DIII-D tokamak has been realized since the previous IAEA meeting. In relation to previous discharges, normalized performance {approx}10 has been sustained for >5 {tau}{sub E} with q{sub min} >1.5. (The normalized performance is measured by the product {beta}{sub N} H{sub 89} indicating the proximity to the conventional {beta} limits and energy confinement quality, respectively.) These H-mode discharges have an ELMing edge and {beta} {approx}{le} 5%. The limit to increasing {beta} is a resistive wall mode, rather than the tearing modes previously observed. Confinement remains good despite the increase in q. The global parameters were chosen to optimize the potential for fully non-inductive current sustainment at high performance, which is a key program goal for the DIII-D facility in the next two years. Measurement of the current density and loop voltage profiles indicate {approx}75% of the current in the present discharges is sustained non-inductively. The remaining ohmic current is localized near the half radius. The electron cyclotron heating system is being upgraded to replace this remaining current with ECCD. Density and {beta} control, which are essential for operating advanced tokamak discharges, were demonstrated in ELMing H-mode discharges with {beta}{sub N}H{sub 89} {approx} 7 for up to 6.3 s or {approx} 34 {tau}{sub E}. These discharges appear to be in resistive equilibrium with q{sub min} {approx} 1.05, in agreement with the current profile relaxation time of 1.8 s.
Country of PublicationUnited States
LanguageEnglish
FormatMedium: X; Size: 18 pages
Availability Oakland Operations Office, Oakland, CA (US); INIS
System Entry Date2008 Feb 05
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