By J. J. Connor
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Advanced diagnostics will be brought to bear on these studies, including the use of planar laser-induced fluorescence to obtain 2-D images of the ion density in MRX current sheets. Further studies of the global MHD aspects of reconnection and investigation of the importance of boundary conditions and 3-D perturbations to the current sheet geometry are planned. The results from these efforts should bring us closer to understanding the important process of magnetic reconnection. Return to TOC Theory and Advanced Simulations T he fusion energy sciences mission of the Princeton Plasma Physics Laboratory (PPPL) Theory Department is to help provide the scientific foundations for establishing magnetic confinement fusion as an attractive, technically feasible sustainable energy source.
A more systematic study of magnetic fluctuations in the current sheet is planned, and any relationship between these fluctuations and the reconnection rate or ion heating will be the subject of future research. Advanced diagnostics will be brought to bear on these studies, including the use of planar laser-induced fluorescence to obtain 2-D images of the ion density in MRX current sheets. Further studies of the global MHD aspects of reconnection and investigation of the importance of boundary conditions and 3-D perturbations to the current sheet geometry are planned.
Low-frequency MHD activities, ~100 kHz on NSTX, are often observed and identified as the toroidicity-induced Alfvén Eigenmodes (TAE’s) driven by NBI ions. They are often accompanied by beam ion losses (up to 15% neutron signal drop) in high-confinement-mode plasmas with high safety factor at the magnetic axis. The numerical analysis of TAE stability using the NOVA-K code has shown good agreement with the observed TAE data. Furthermore, by creating very similar plasma conditions on NSTX and the DIII-D tokamak, similarity experiments were designed to verify the theoretical predictions that the toroidal mode number of the most unstable TAEs scales with the machine size.
Finite Element Techniques for Fluid Flow by J. J. Connor