Effect of isotope mass on transport simulations of Joint European Torus high-mode plasmas with Edge Localized Modes

Journal Article · Wed Dec 01 04:00:00 EST 1999 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.873724· OSTI ID:690717

Bateman, G; Kritz, A H; Parail, V V; Cordey, J G ^[1]

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

The effect of isotopic mass on heat and particle transport in Joint European Torus (JET) [P.-H. Rebut {ital et al.}, Nucl. Fusion {bold 25}, 1011 (1985)] plasma discharges is studied using the Multi-Mode model in the BALDUR predictive transport code [Bateman {ital et al.}, Phys. Plasmas {bold 5}, 1793 (1998)]. Temperature and density profiles from these simulations generally agree with the experimentally measured profiles for high-mode JET discharges with Edge Localized Modes in hydrogen, deuterium, and tritium discharges. It is surprising that a purely gyro-Bohm transport model, used in these simulations, correctly predicts the experimentally observed improvement in confinement as the isotope mass is increased{emdash}given the fact that gyro-Bohm diffusion coefficients increase with isotope mass when the shapes of all the plasma profiles are held fixed. However, in the JET experiment, it was found that the electron and ion temperature at the top of the edge pedestal increases systematically as the isotope mass in increased (J. G. Cordey {ital et al.}, Report No. JET-P (98)53, 1998). The numerical simulations reported here show that this increase in the edge temperatures and subsequent broadening of the temperature profiles account for the improvement in confinement as the isotope mass is increased. {copyright} {ital 1999 American Institute of Physics.}

• OSTI ID: 690717
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 6; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHARGED-PARTICLE TRANSPORT
EDGE LOCALIZED MODES
ION TEMPERATURE
ISOTOPE EFFECTS
JET TOKAMAK
PLASMA CONFINEMENT
PLASMA SIMULATION
TOKAMAK DEVICES