Predictive transport simulations of internal transport barriers using the Multi-Mode model

Journal Article · Sat Jul 01 04:00:00 EDT 2000 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.874140· OSTI ID:20216869

Zhu, P ^[1]; Bateman, G ^[1]; Kritz, A H ^[1]; Horton, W ^[1]

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1. Physics Department, Lehigh University, 16 Memorial Drive East, Bethlehem, Pennsylvania 18015 (United States)

The formation of internal transport barriers observed in both Joint European Torus (JET) [P. H. Rebut, R. J. Bickerton, and B. E. Keen, Nucl. Fusion 25, 1011 (1985)] and Doublet III-D Tokamak (DIII-D) [J. L. Luxon and L. G. Davis, Fusion Technol. 8, 441 (1985)] are reproduced in predictive transport simulations. These simulations are carried out for two JET-optimized shear discharges and two DIII-D negative central shear discharges using the Multi-Mode model in the time-dependent 1-1/2-D BALDUR transport code [C. E. Singer et al., Comput. Phys. Commun. 49, 275 (1988)]. The Weiland model is used for drift modes in the Multi-Mode model in combination with either Hahm-Burrell or Hamaguchi-Horton flow shear stabilization mechanisms, where the radial electric field is inferred from the measured toroidal velocity profile and the poloidal velocity profile computed using neoclassical theory. The transport barriers are apparent in both the ion temperature and thermal diffusivity profiles of the simulations. The timing and location of the internal transport barriers in the simulations and experimental data for the DIII-D cases are in good agreement, though some differences remain for the JET discharges. The formations of internal transport barriers are interpreted as resulting from a combination of ExB flow shear and weak magnetic shear mechanisms. (c) 2000 American Institute of Physics.

• OSTI ID: 20216869
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 7; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHARGED-PARTICLE TRANSPORT
JET TOKAMAK
PLASMA SIMULATION
SHEAR
THEORETICAL DATA
TOKAMAK DEVICES