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Title Wall stabilization of high beta plasmas in DIII-D
Creator/Author Taylor, T.S. ; Strait, E.J. ; Lao, L.L. ; Turnbull, A.D. ; Burrell, K.H. ; Chu, M.S. ; Ferron, J.R. ; Groebner, R.J. ; La Haye, R.J. [General Atomics, San Diego, CA (United States)] ; Mauel, M. [Columbia Univ., New York, NY (United States)] [and others]
Publication Date1995 Feb 01
OSTI IdentifierOSTI ID: 42489; Legacy ID: DE95009607
Report Number(s)GA-A--21914; CONF-941101--9
DOE Contract NumberAC03-89ER51114;AC05-84OR21400;W-7405-ENG-48
Other Number(s)Other: ON: DE95009607; TRN: TRN: 95:003551
Resource TypeConference
Resource RelationConference: Meeting of the Division of Plasma Physics of the American Physical Society, Minneapolis, MN (United States), 7-11 Nov 1994; Other Information: PBD: Feb 1995
Research OrgGeneral Atomics, San Diego, CA (United States); Oak Ridge National Lab., TN (United States); Lawrence Livermore National Lab., CA (United States)
Sponsoring OrgUSDOE, Washington, DC (United States)
Subject70 PLASMA PHYSICS AND FUSION; DOUBLET-3 DEVICE; STABILIZATION; HIGH-BETA PLASMA; ROTATING PLASMA; MHD EQUILIBRIUM; VACUUM SYSTEMS
Description/AbstractDetailed analysis of recent high beta discharges in the DIII-D tokamak demonstrates that the resistive vacuum vessel can provide stabilization of low n magnetohydrodynamic (MHD) modes. The experimental beta values reaching up to {beta}{sub T} = 12.6% are more than 30% larger than the maximum stable beta calculated with no wall stabilization. Plasma rotation is essential for stabilization. When the plasma rotation slows sufficiently, unstable modes with the characteristics of the predicted {open_quotes}resistive wall{close_quotes} mode are observed. Through slowing of the plasma rotation between the q = 2 and q = 3 surfaces with the application of a non-axisymmetric field, the authors have determined that the rotation at the outer rational surfaces is most important, and that the critical rotation frequency is of the order of {Omega}/2{pi} = 1 kHz.
Country of PublicationUnited States
LanguageEnglish
FormatMedium: ED; Size: 29 p.
Availability INIS; OSTI as DE95009607
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System Entry Date2009 Nov 04
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