The Woodruff School

SUMMARY

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 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.

SUBJECT:	Ph.D. Dissertation Defense

BY:	Zachary Friis

TIME:	Thursday, March 18, 2010, 1:30 p.m.

PLACE:	Boggs, 3-47

TITLE:	An Examination of the Effects of Neutral Particles on the Edge Plasma in Tokamaks

COMMITTEE:	Dr. Weston Stacey, Chair (NRE) Dr. Farzad Rahnema (NRE) Dr. Nolan Hertel (NRE) Dr. C.-K. Chris Wang (NRE) Dr. Thomas Barker (BME) Dr. Richard Groebner (GA) Dr. Yunfeng Liang (FZJ)

SUMMARY 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 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.