Detailed OEDGE modeling of core-pedestal fueling in DIII-D

Conference · Tue Jan 01 04:00:00 EST 2013

OSTI ID:1092382

Elder, J. D. ^[1]; Leonard, A. W. ^[2]; Stangeby, P. C. ^[1]; Boedo, J. A. ^[3]; Bray, B. D. ^[4]; Brooks, N. H. ^[4]; Fenstermacher, M. E. ^[5]; Reiter, D. ^[6]; Unterberg, Ezekial A ^[7]; Watkins, J. G. ^[8]; Lisgo, S. ^[9]

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1. University of Toronto, Canada
2. General Atomics
3. University of California, San Diego
4. General Atomics, San Diego
5. Lawrence Livermore National Laboratory (LLNL)
6. Forschungszentrum Julich, Julich, Germany
7. ORNL
8. Sandia National Laboratories (SNL)
9. EURATOM CCFE Fus Assoc, Culham Sci Ctr, Abingdon, Oxon, England

The OEDGE code is used to model core fueling for attached L-mode plasmas and between edge localized modes (ELMs) for attached H-mode plasmas in DIII-D. Empirical plasma reconstruction has been used to determine the plasma conditions in these discharges. EIRENE is used to model the hydrogen recycling. Divertor recycling accounts for 65 100% of the core fueling. The fraction of the total divertor target flux ionized inside the separatrix ranges from 5% to 20%. The fraction of total wall flux ionized inside the separatrix ranges from 20% to 50%. Neutrals originating from wall regions closer to the separatrix are more likely to ionize in the confined plasma. Ionization in the confined plasma is concentrated below the midplane with peaks in the poloidal profiles just above the X-point. Radial core ionization in high density H-mode is peaked strongly near the separatrix.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1092382
• Country of Publication: United States
• Language: English