Physics – Plasma Physics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..dpp..2q22r&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 10-15, 1996, abstract #2Q.22
Physics
Plasma Physics
Scientific paper
It has been suggested that a comet cross-section shaped tokamak (κ<1, δ<0) will improve tokamak transport properties by reducing or reversing the precessional drift direction creating a ``maximum-J" configuration (J=øint v_allel ds). This would reduce the drive for collisionless trapped particle modes. Previous studies indicate that this approach is particularly effective in reversing the precessional drift in the outer half of the plasma. It has also been suggested that a second stability regime of the virulent toroidal ion-temperature-gradient driven (ITG) instability exists and is more easily accessible in this geometry, even though the ITG mode is not driven by the trapped particle population. Here, we examine the variation of maximum-J properties with shaping and aspect ration. We examine the linear ideal-MHD stability of comet-shaped plasmas using the PEST, KINX and DCON numerical codes. Additionally, we search for profiles that are also stable with respect to ITG and trapped particle modes, using the IFS comprehensive kinetic microinstability code. Supported by U.S. DOE.
Dorland William
Freidberg J. P.
Glasser Alexander
Kesner Jay
Kotschenreuther M.
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