Abstract
Fusion power has been increased by a factor of 3 in DIII-D by tailoring the pressure profile to avoid the kink instability in H-mode plasmas. The resulting plasmas are found to have neoclassical ion confinement. This reduction in transport losses in beam-heated plasmas with negative central shear is correlated with a dramatic reduction in density fluctuations. Improved magnetohydrodynamic stability is achieved by controlling the plasma pressure profile width. In deuterium plasmas the highest gain Q (the ratio of fusion power to input power), was 0.0015, corresponding to an equivalent Q of 0.32 in a deuterium-tritium plasma.
Original language | English |
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Pages (from-to) | 2714-2717 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 77 |
Issue number | 13 |
DOIs | |
State | Published - 1996 |
Externally published | Yes |