Scrape-off layer modeling of radiative divertor and high heat flux experiments on D III-D

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:5187378

Campbell, R B ^[1]; Petrie, T W ^[2]; Hill, D N ^[3]

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1. Sandia National Labs., Albuquerque, NM (United States)
2. General Atomics, San Diego, CA (United States)
3. Lawrence Livermore National Lab., CA (United States)

We use a new multispecies 1-D fluid code, NEWT-1D, to model DIII-D scrape-off layer (SOL) behavior during radiative divertor and high heat flux experiments. The separatrix location and the width of the SOL are uncertain, and affect the comparison of the data in important ways. The model agrees with many of the experimental measurements for a particular prescription for the separatrix location. The model cannot explain the recent data on the separatrix T{sub i} with a conventional picture of ion and electron power flows across the separatrix. Radial transport of particles and heat in some form is required to explain the peak heat flux data before and after gas puffing. For argon puffing in the private flux region, entrainment is poor in the steady state. The calculations suggest that strike point argon puffing is a slot divertor geometry results in substantially better entrainment. Self-consistent, steady-state solutions with radiated powers up to 80% of the SOL power input are obtained in 1-D. We discuss significant radial effects which warrant the development of a code which can treat strongly radiating impurities in 2-D geometries.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5187378
• Report Number(s): SAND-91-2506C; CONF-920311--14; ON: DE92015007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700330 -- Plasma Kinetics
Transport
& Impurities-- (1992-)
700420* -- Fusion Technology-- Plasma-Facing Components-- (1992-)
BEAM INJECTION
BOUNDARY LAYERS
CLOSED PLASMA DEVICES
COMPUTERIZED SIMULATION
DIVERTORS
DOUBLET-3 DEVICE
HEAT FLUX
IMPURITIES
LAYERS
MATHEMATICAL MODELS
NEUTRAL ATOM BEAM INJECTION
PLASMA IMPURITIES
PLASMA SCRAPE-OFF LAYER
SIMULATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES