UEDGE simulation of detached divertor operation in DIII-D with a chemically sputtered carbon source

Conference · Wed May 21 00:00:00 EDT 1997

OSTI ID:645331

Porter, G D; Rognlien, T D; Fenstermacher, M E; Hill, D N; Lasnier, C J; Isler, R C

We describe the response of the scrape-off layer (SOL) plasma to variations in the intensity, and geometry of an intrinsic carbon source in DIII-D. Using the multi species 2-D fluid plasma code UEDGE we find plasma modes which are similar to those seen experimentally. At high sputtering coefficient the plasma discontinuously transitions to a state in which the radiation power exceeds the input power and no steady state solution is obtained. We believe this corresponds to the MARFE (Multifaceted Asymmetric Radiation from Edge) state seen experimentally, in which the core confinement is reduced.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48; AC03-89ER51114
• OSTI ID: 645331
• Report Number(s): UCRL-JC-127389; CONF-9706131-; ON: DE98051336; TRN: 98:008950
• Resource Relation: Conference: 24. EPS conference on controlled fusion and plasma physics, Berchtesgaden (Germany), 9-13 Jun 1997; Other Information: PBD: 21 May 1997
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
DIVERTORS
COMPUTERIZED SIMULATION
U CODES
TWO-DIMENSIONAL CALCULATIONS
CARBON
SPUTTERING