Physics – Plasma Physics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dpplwp304m&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 17-21, 1997, abstract #lWepP304.
Physics
Plasma Physics
Scientific paper
A comprehensive diagnostics set for MHD activity and impurity transport studies is implemented on CDX-U. The MHD activity in the core is characterized by a persistent m=1/n=1 rotating mode, while the outer plasma activity is dominated by an m=2/n=1 mode. To unfold the geometric characteristics of the m=1 island we fit the singular value decomposition (SVD) of a computer generated image to that of the experimental image. The results show significant asymmetries in island emissivity and magnetic fluctuations. Another ubiquitous phenomenon in CDX-U plasmas is the internal magnetic reconnection (IRE). The USXR data suggests that this is caused by the growth and overlap of the m=1 and m=2 modes. Interestingly, despite significant cooling of the core, the q =1 surface seems to survive through the reconnection but shrinks in radius, consistent with a current profile flattening. At the same time, the edge q increases, consistent with the relative immunity to disruptions of spherical tori. Following hints of Ti increases after IRE's (START, UK), we have begun investigating the reconnection as a possible magnetic heating mechanism, a topic of major astrophysical interest.
Cdx-U Group
Finkenthal Michael
May Michael J.
Moos Warren H.
Regan S. P.
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