Radiative divertor modeling studies

Conference · Wed May 05 04:00:00 EDT 1993

OSTI ID:10178663

Rensink, M E; Allen, S L; Hill, D N; Kaiser, T B; Rognlien, T D

A two-dimensional fluid code called UEDGE is used to simulate the edge plasma in tokamak divertors and to evaluate methods for reducing the heat load on divertor plates by radiating some of the power before it reaches the plates. UEDGE is a fully-implicit code being developed jointly by us, D. A. Knoll and R. B. Campbell. For these studies, UEDGE uses a banded matrix solver and a fixed-fraction impurity model. Work is presently underway with Knoll and Campbell to include a memory-efficient iterative solver and a model of impurity transport. Simulations of the proposed TPX device show that a few percent nitrogen concentration in the scrape-off layer can radiate up to 80% of the divertor power, thus reducing the peak heat flux and electron temperature at the divertor plate to acceptable values. A comparison of the neutral gas distribution from UEDGE with results from the DEGAS Monte Carlo neutrals code confirms the validity of our fluid neutrals model.

• 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: 10178663
• Report Number(s): UCRL-JC--113033; CONF-930720--18; ON: DE93018092
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700370
700420
DIVERTORS
ELECTRON TEMPERATURE
FLOW MODELS
HEAT FLOW
ITERATIVE METHODS
MHD EQUILIBRIUM
PLASMA FLUID AND MHD PROPERTIES
PLASMA SCRAPE-OFF LAYER
PLASMA-FACING COMPONENTS
TOKAMAK DEVICES
U CODES