The Physics Basis For An Advanced Physics And Advanced Technology Tokamak Power Plant Configuration, ARIES-ACT1
Authors: Charles Kessel, et. al.
Abstract: The advanced physics and advanced technology tokamak power plant ARIES-ACT1 has
a major radius of 6.25 m at aspect ratio of 4.0, toroidal field of 6.0 T, strong shaping with
elongation of 2.2 and triangularity of 0.63. The broadest pressure cases reached wall
stabilized βN ~ 5.75, limited by n=3 external kink mode requiring a conducting shell at
b/a = 0.3, and requiring plasma rotation, feedback, and or kinetic stabilization. The
medium pressure peaking case reached βN = 5.28 with BT = 6.75, while the peaked
pressure case reaches βN < 5.15. Fast particle MHD stability shows that the alpha
particles are unstable, but this leads to redistribution to larger minor radius rather than
loss from the plasma. Edge and divertor plasma modeling show that about 75% of the
power to the divertor can be radiated with an ITER-like divertor geometry, while over
95% can be radiated in a stable detached mode with an orthogonal target and wide slot
geometry. The bootstrap current fraction is 91% with a q95 of 4.5, requiring about ~ 1.1
MA of external current drive. This current is supplied with 5 MW of ICRF/FW and 40
MW of LHCD. EC was examined and is most effective for safety factor control over ρ ~
0.2-0.6 with 20 MW. The pedestal density is ~ 0.9x1020 /m3 and the temperature is ~ 4.4
keV. The H98 factor is 1.65, n/nGr = 1.0, and the net power to LH threshold power is 2.8-
3.0 in the flattop.
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Accepted for publication in: Fusion Science and Technology; January 2015, AIRES-ACT special issue
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Download PPPL-5006 (pdf 3.6 MB 56 pp)
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