(Georgia Institute of Technology, 2010-02-23)
Friis, Zachary Ward; Stacey, Weston M.; Leonard, Anthony W.; Rensink, M. E.
A detailed analysis of neutral atom recycling and pedestal fueling in a DIII-D _J. Luxon, Nucl.
Fusion 42, 614 _2002__ high-confinement mode discharge is presented. Experimental data and
two-dimensional _2D_ edge plasma fluid code calculations are employed to provide ion wall
recycling and recombination neutral sources and background edge plasma parameters for a 2D edge
neutral code calculation of detailed neutral density, ionization, and charge-exchange distributions
throughout the edge pedestal, scrape-off layer and surrounding halo region, divertor, and private flux
regions. The effectiveness of the different neutral sources for fueling the confined plasma is
evaluated
(Georgia Institute of Technology, 2009-02)
Friis, Zachary Ward
The GTNEUT code1-3 can provide a computationally economical and accurate calculation of neutral
particle transport in the complex 2D geometry to the tokamak divertor, scrapeoff layer and edge regions
inside of the separatrix. However, the GTNEUT code requires a geometric input file describing this
geometry and a background plasma file describing the plasma density and temperature in the various
geometric regions. This report describes semi-automated procedures: i) for using (and extending) the
input preparation capability of the UEDGE4-5 code to generate a GTNEUT geometric grid input file from
a DIII-D EFIT file and ii) for using the plasma density and temperature distributions calculated with the
UEDGE code to generate the background plasma input file for GTNEUT.