Observation of n=1 Resistive Interchange Mode in low-β Plasmas

Details Observation of n=1 Resistive Interchange Mode in low-β Plasmas Observation of n=1 Resistive Interchange Mode in low-β Plasmas

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..dpp.ro207i&link_type=abstract

American Physical Society, 41st Annual Meeting of the Division of Plasma Physics, November 15-19, 1999 Seattle, WA, abstract #RO

Physics

Plasma Physics

Scientific paper

A localized MHD perturbation, which is identified as a resistive interchange mode, has been observed during the current ramp of Alcator C-Mod, when βN is as low as 0.15. Using two grating polychromators which can cover more than half of the whole plasma profile, very localized (within 2cm) Te fluctuations were observed in the core region, which has a hollow equilibrium Te profile. Based on magnetic diagnostics, the toroidal mode number is n=1. The pressure gradients at the channels where the fluctuations were observed were positive (p^' >0) and they were located close to an inner rational surface of the reversed q-profile with q = 5. According to resistive interchange mode theory(GLASSER, A.H. et al., Phys. Fluids. 19) (1976) 567, such a hollow pressure profile with q > 1 in a low-β plasma can be unstable. A resistive MHD analysis of this equilibrium, using the MARS(BONDESON, A. et al, Phys. Fluids B4) (1992) 1889 code, predicts such an unstable mode with toroidal mode number, n=1. Unlike DIII-D observations(CHU, M.S. et al., Phys. Rev. Lett. 77 )(1996) 2710, this resistive interchange mode during low-β plasma is due to the inverted pressure gradient in the core, not to high β.

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