Journal
NUCLEAR FUSION
Volume 57, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/aa7186
Keywords
magnetic fusion; steady-state tokamak; current profile control; lower hybrid
Categories
Funding
- US Department of Energy, Office of Science, Office of Fusion Energy Sciences [DE-FC02-04ER54698, DE-SC0010685, DE-SC-0010492, DE-FG02-01ER54615, DE-AC02-09CH11466, DE-AC52-07NA27344]
- National Magnetic Confinement Fusion Program of China [2015GB102002, 2015GB103000]
- U.S. Department of Energy (DOE) [DE-FG02-01ER54615] Funding Source: U.S. Department of Energy (DOE)
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Recent experiments on EAST have achieved the first long pulse H-mode (61 s) with zero loop voltage and an ITER-like tungsten divertor, and have demonstrated access to broad plasma current profiles by increasing the density in fully-noninductive lower hybrid current-driven discharges. These long pulse discharges reach wall thermal and particle balance, exhibit stationary good confinement (H-98y2 similar to 1.1) with low core electron transport, and are only possible with optimal active cooling of the tungsten armors. In separate experiments, the electron density was systematically varied in order to study its effect on the deposition profile of the external lower hybrid current drive (LHCD), while keeping the plasma in fully-noninductive conditions and with divertor strike points on the tungsten divertor. A broadening of the current profile is found, as indicated by lower values of the internal inductance at higher density. A broad current profile is attractive because, among other reasons, it enables internal transport barriers at large minor radius, leading to improved confinement as shown in companion DIII-D experiments. These experiments strengthen the physics basis for achieving high performance, steady state discharges in future burning plasmas.
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