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Title	MHD stability studies in reversed shear plasmas in TFTR
Creator/Author	Manickam, J. ; Fredrickson, E. ; Chang, Z. [and others]
Publication Date	1996 Dec 31
OSTI Identifier	OSTI ID: 519124 ; DE97005297
Report Number(s)	PPPL-CFP--3641; IAEA-CN--64/A5-2;CONF-961005--27
DOE Contract Number	AC02-76CH03073
Resource Type	Conference
Resource Relation	16. International Atomic Energy Agency (IAEA) international conference on plasma physics and controlled nuclear fusion research, Montreal (Canada), 7-11 Oct 1996 ; PBD: 1996
Research Org	Princeton Univ., NJ (United States). Plasma Physics Lab.
Sponsoring Org	USDOE Office of Energy Research, Washington, DC (United States);Department of Trade and Industry, London (United Kingdom);Association Euratom, Brussels (Belgium)
Subject	70 PLASMA PHYSICS AND FUSION ; TFTR TOKAMAK; MHD EQUILIBRIUM; PLASMA INSTABILITY; PLASMA DISRUPTION; PLASMA HEATING
Description/Abstract	MHD phenomena in reversed shear plasmas in TFTR are described during each of the three phases of the evolution of these discharges: the current ramp, high power neutral beam heating and after the beam power has been reduced. Theoretical analysis of discharges which disrupted in the high-{beta} phase indicates that the{beta} - limit is set by the ideal n= 1 infernal/kink mode. The mode structure of the disruption precursor reconstructed from the electron temperature data compares favorably with the predicted displacement vector from the ideal MHD model. In contrast, disruptions during the early and late phases are due to resistive instabilities, double tearing modes coupled to high-m edge modes. The resistive interchange mode, predicted to be unstable in reversed shear plasmas, is not seen in the experiment. Neo-classical tearing mode theory is shown to describe the non-disruptive MHD phenomena. A nonlinear resistive MHD simulation reproduces off-axis sawtooth-like crashes during the post-beam phase. The dependence of the{beta}-limit on the pressure peakedness and q{sub min} is discussed, showing a path to stable higher-{beta} regimes.
Country of Publication	United States
Language	English
Format	12 p. ; PL:
Availability	INIS; OSTI as DE97005297 To purchase this media from NTIS, click here
System Entry Date	2001 May 05
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