UEDGE and DEGAS modeling of the DIII-D scrape-off layer plasma. Revision 1

Conference · Sun May 01 00:00:00 EDT 1994

OSTI ID:10126308

Fenstermacher, M E; Porter, G D; Rensink, M E; Rognlien, T D; Allen, S L; Hill, D N; Lasnier, C J ^[1]; Leonard, T; Petrie, T ^[2]

---

1. Lawrence Livermore National Lab., CA (United States)
2. General Atomics, San Diego, CA (United States)

This paper presents work to develop benchmarked theoretical models of scrape-off-layer (SOL) characteristics in diverted tokamaks by comparing shot simulations using the UEDGE plasma fluid and DEGAS neutral transport codes to measurements of the DIII-D SOL plasma. The experimental data include the radial profiles of n{sub e} T{sub e}, and T{sub i}, the divertor exhaust power, the intensity of H{sub {alpha}} emission, and profiles of the radiated power. A very simple model of the anomalous perpendicular transport rates produces consistency between the calculated and measured radial profiles of the divertor power, and of the midplane densities and temperatures. Experimentally, the measured exhaust power is now 80--90% of the input power. The simulated peak power on the outer leg of the divertor floor is now within 20% of the measured power. Various sensitivities of these comparisons to model assumptions are described. Finally, these benchmarked models have been used to examine the effects of various baffle configurations for the Radiative Divertor Upgrade in DIII-D.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10126308
• Report Number(s): UCRL-JC-115491-Rev.1; CONF-940580-23-Rev.1; ON: DE95008052
• Resource Relation: Conference: 11. international conference on plasma surface interactions in controlled fusion devices,Mito (Japan),23-27 May 1994; Other Information: PBD: May 1994
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DOUBLET-3 DEVICE
PLASMA SCRAPE-OFF LAYER
PLASMA SIMULATION
U CODES
D CODES
DIVERTORS
ELECTRON DENSITY
ELECTRON TEMPERATURE
ION TEMPERATURE
EDGE LOCALIZED MODES
TEMPERATURE DISTRIBUTION
700420
700330
PLASMA-FACING COMPONENTS
PLASMA KINETICS, TRANSPORT, AND IMPURITIES