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Title Optimization of negative central shear discharges in shaped cross sections
Creator/Author Turnbull, A.D., Chu, M.S., Taylor, T.S., Casper, T.A., Rice, B.W. [Lawrence Livermore National Lab., CA (United States)] ; Greene, J.M., Greenfield, C.M., La Haye, R.J., Lao, L.L., Lee, B.J. [Univ. of California, (San Diego)] ; Miller, R.L., Ren, C., Strait, E.J., Tritz, K. [Univ of Wisconsin, (Madison)] ; Rettig, C.L., Rhodes, T.L. [Univ of California, (Los Angeles)] ; Sauter, O. [CRPP-EPFL, Lausanne (Switzerland)]
Publication Date1996 Oct 01
OSTI IdentifierOSTI ID: 455543; Legacy ID: DE97003829
Report Number(s)GA-A--22482; CONF-950956--6
DOE Contract NumberAC03-89ER51114;FG03-95ER54294;FG05-88ER53266;W-7405-ENG-48
Other Number(s)Other: ON: DE97003829
Resource TypeConference
Resource RelationConference: 16. IEEE/NPSS symposium on fusion engineering, Champaign, IL (United States), 30 Sep - 5 Oct 1995; Other Information: PBD: Oct 1996
Research OrgGeneral Atomics, San Diego, CA (United States)
Sponsoring OrgUSDOE Office of Energy Research, Washington, DC (United States)
Subject70 PLASMA PHYSICS AND FUSION; TOKAMAK DEVICES; PLASMA INSTABILITY; SHEAR; MAGNETOHYDRODYNAMICS; BETA RATIO; PLASMA DISRUPTION; DOUBLET-3 DEVICE; OPTIMIZATION
Description/AbstractMagnetohydrodynamic (MHD) stability analyses of Negative Central Shear (NCS) equilibria have revealed a new understanding of the limiting MHD instabilities in NCS experiments. Ideal stability calculations show a synergistic effect between cross section shape and pressure profile optimization; strong shaping and broader pressure independently lead to moderately higher {Beta} limits, but broadening of the pressure profile in a strongly dee-shaped cross- section leads to a dramatic increase in the ideal {Beta} limit. Localized resistive interchange (RI) modes can be unstable in the negative shear region and are most restrictive for peaked pressure profiles. Resistive global modes can also be destabilized significantly below the ideal P limit. Experiments largely confirm the general trends, and diagnostic measurements and numerical stability calculations are found to be in good qualitative agreement. Observed disruptions in NCS discharges with L-mode edge and strongly peaked pressure, appear to be initiated by interactions between the RI, and the global ideal and resistive modes.
Country of PublicationUnited States
LanguageEnglish
FormatMedium: ED; Size: 16 p.
Availability INIS; OSTI as DE97003829
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System Entry Date2009 Nov 12
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