Journal
NUCLEAR FUSION
Volume 57, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/aa7807
Keywords
gyrokinetic simulation; plasma turbulence; neutral recycling; tokamak; FEC 2016
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Funding
- US DOE [DE-AC02-09CH11466]
- Scientific Discovery through Advanced Computing (SciDAC) program - US DOE Office of Advanced Scientific Computing Research
- US DOE Office of Advanced Scientific Computing Research
- Office of Fusion Energy Sciences
- DOE Office of Science User Facility [DE-AC05-00OR22725, DE-AC02-05CH11231]
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The effects of recycled neutral atoms on tokamak ion temperature gradient (ITG) driven turbulence have been investigated in a steep edge pedestal, magnetic separatrix configuration, with the full-f edge gryokinetic code XGC1. An adiabatic electron model has been used; hence, the impacts of neutral particles and turbulence on the density gradient are not considered, nor are electromagnetic turbulence effects. The neutral atoms enhance the ITG turbulence, first, by increasing the ion temperature gradient in the pedestal via the cooling effects of charge exchange and, second, by a relative reduction in the E x B shearing rate.
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