Physics – Plasma Physics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..dpp..2q27m&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 10-15, 1996, abstract #2Q.27
Physics
Plasma Physics
Scientific paper
Tokamaks with off-axis current maxima have been identified as attractive candidates for fusion reactors because of the combination of improved MHD stability, enhanced confinement and large bootstrap fraction. These current profiles have shear reversal in the safety factor profile. Within the region of negative shear the ballooning modes are intrinsically stable and permit large pressure gradients. Low-n MHD instabilities determine the β-limit. The off-axis peaking improves the alignment of the bootstrap current. The enhanced Shafranov shift due to the low axial current combined with the shear reversal improves the microstability of the plasma. These studies have been carried out within the context of fixed plasma geometry, generally low aspect-ratio circular or dee-shapes. Comprehensive toroidal microinstability calculations(Kotschenreuther et al. this conference ) suggest that the most favorable shape for confinement is an oblate comet, with the tail pointing inwards. Results of the MHD stability of a range of shapes, including the comet, circle, dee and bean will be presented. Self consistent tranport profiles are considered, as well as MHD optimized profiles. External wall effects are also considered.
Dorland William
Kotschenreuther M.
Manickam J.
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