Physics – Plasma Physics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dppdmp116m&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 17-21, 1997, abstract #dMopP116.
Physics
Plasma Physics
Scientific paper
The m/n=1/1 mode is known to play an important role in experiments, including sawtooth oscillations, fishbone modes and in determining the β-limit. However there is significant difficulty when comparing experiment with theory. One of the more striking inconsistencies is that the experimentally observed β-limits are not consistent with the ideal MHD stability of the 1/1 mode. The common assumption is that kinetic effects can account for this inconsistency. Efforts to verify this have generally used simple analytic models for the equilibrium and have included a restricted subset of the possible kinetic effects. In this work we will present the results of a study which uses an approach based on Cheng, (Phys. Reports 211 (1992) 1), where a dispersion relation was derived including contributions to δW from ideal MHD and kinetic effects. The ideal contribution is computed from well established codes, PEST/NOVA, the kinetic contribution is determined using a new extension to the NOVA-K code (Gorelenkov et. al. Bull. Am. Phys. Soc. 41 (1996) 1381). The latter includes non-ideal effects such as FLR, ω and finite orbit width. Analysis of neutral beam heated supershot plasmas in TFTR which are experimentally determined to have q_axis less than unity but do not exhibit 1/1 activity will be presented.
Cheng C. Z.
Fu Guo-Yong
Gorelenkov Nikolai
Manickam J.
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