Comparison of two drift wave models in transport simulations

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:489387

Kritz, A H; Redd, A J; Kinsey, J E; Bateman, G ^[1]

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1. Lehigh Univ., Bethlehem, PA (United States)

Predictive transport simulations of the temperature and density profiles have been carried out using a combination of theoretically derived models, with the intent of discovering the best available model for drift wave contribution to the transport in tokamak plasmas. These self-consistent time-dependent simulations are performed using the BALDUR 1-{1/2} D transport code. The theoretically-derived multi-mode transport model used in this study includes contributions from either the Weiland theory of trapped electron and ion temperature gradient modes or the Dominguez-Waltz drift-wave model. These theoretically derived models are utilized without any introduction of adjustable parameters in our studies. Simulation results axe presented for L-mode scans in plasma current, density, and neutral beam power for the Tokamak Fusion Test Reactor (TFTR) and the Joint European Torus (JET). The Dominguez-Waltz model has been reasonably successful in previous studies. However, the Weiland model predicts transport separately for four different transport channels (electrons, ions, hydrogenic particles and impurities) and accounts for physical effects not included in Dominguez-Waltz theory, such as non-diffusive terms, unequal electron and ion temperatures, and finite Larmor radius. It has been found in these simulations that the Weiland model predicts electron density profiles that more closely fit experimental data than does the Dominguez-Waltz model. The particle pinch included in the Weiland model often results in more peaked density profiles in agreement with experimental data. The differences between temperature profiles predicted by the Weiland and Dominguez-Waltz drift wave models are relatively small for many cases.

• DOE Contract Number: FG02-92ER54141
• OSTI ID: 489387
• Report Number(s): CONF-960354--
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHARGED-PARTICLE TRANSPORT
PLASMA DRIFT
PLASMA SIMULATION
TOKAMAK DEVICES