Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre16004a&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The DIII-D research program has made steady progress toward developing the scientific basis of an optimized tokamak. We observe that operation at high-β is often limited by a kink MHD mode associated with the resistive plasma wall. By minimizing magnetic error fields and maintaining the plasma toroidal rotation, these modes are stabilized and βN is increased to twice the estimated limit with no plasma wall. In other cases, operation is limited by neoclassical tearing modes. We find that by applying very localized ( ~1 cm) electron cyclotron current drive (ECCD) with gyrotrons, β was increased 20% above the NTM-onset value even in the presence of sawteeth oscillations. The current driven by ECCD, even off the plasma axis, agrees with theoretical predictions. Computer models project that future experiments with more gyrotron power will enable detailed control of the plasma current profile, a necessary ingredient for operation at high_β. The interface between the hot core plasma and the cooler plasma edge and wall has also been studied, and the control of power and particle exhaust is accomplished with a magnetic divertor (open field line region). Noble gas injection has proven an effective disruption mitigation technique. These and other recent highlights from the 2001 campaign will be presented.
Allen Steven L.
Diii-D Team
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