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Author Clauser, C. F. ♦ Farengo, R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ ALPHA PARTICLES ♦ COLLISIONS ♦ COMPUTERIZED SIMULATION ♦ DIFFUSION ♦ DIVERTORS ♦ MONTE CARLO METHOD ♦ ORBITS ♦ PLASMA ♦ PLASMA DENSITY ♦ PLASMA SCRAPE-OFF LAYER ♦ RANDOMNESS
Abstract Alpha particles diffusion due to charge changes in a magnetized plasma is studied. Analytical calculations and numerical simulations are employed to show that this process can be very important in the pedestal-edge-SOL regions. This is the first study that presents clear evidence of the importance of atomic processes on the diffusion of alpha particles. A simple 1D model that includes inelastic collisions with plasma species, “cold” neutrals, and partially ionized species was employed. The code, which follows the exact particle orbits and includes the effect of inelastic collisions via a Monte Carlo type random process, runs on a graphic processor unit (GPU). The analytical and numerical results show excellent agreement when a uniform background (plasma and cold species) is assumed. The simulations also show that the gradients in the density of the plasma and cold species, which are large and opposite in the edge region, produce an inward flux of alpha particles. Calculations of the alpha particles flux reaching the walls or divertor plates should include these processes.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-12-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 22
Issue Number 12


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