The Tokamak simulation code (TSC) is used to provide initial conditions for predictive TRANSPort and integrated modeling code (PTRANSP) simulations of ITER target steady state scenarios. The PTRANSP simulations are carried out using the new multi-mode (MMM7.1) and the gyro-Landau-fluid (GLF23) transport models. It is found that there are circumstances under which the total fusion power decreases with increasing pedestal temperature height. When the total current (from magnetic axis to plasma edge) is fixed, an increased fraction of the current is concentrated in the pedestal region as the pedestal height is increased. As a consequence of the fixed total current, this results a smaller fraction of the current in the core plasma and, consequently, lower energy confinement. In previous simulations of ITER, in which the fusion power increased with increasing pedestal temperature height, the plasma current from the top of the pedestal to the magnetic axis was held fixed independent of the pedestal temperature. Simulations presented in this paper also indicate that improvement in fusion power production occurs when the lower hybrid current drive is replaced with electron cyclotron current drive. Again, the improvement results from the redistribution of plasma current since the lower hybrid power generally drives current closer to the plasma edge than does the electron cyclotron power. ITER simulation results obtained using the MMM7.1 transport model are compared with those using the GLF23 model. It is found that, in simulations of target steady state scenarios, momentum transport and flow-shear suppression features of the new MMM7.1 model can lead to predictions of internal transport barriers in temperature and rotation frequency.
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November 2011
Research Article|
November 28 2011
Effect of pedestal height and internal transport barriers on International Thermonuclear Experimental Reactor target steady state simulations
T. Rafiq;
T. Rafiq
1Department of Physics,
Lehigh University
, 16 Memorial Drive East, Bethlehem, Pennsylvania 18015, USA
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A. H. Kritz;
A. H. Kritz
1Department of Physics,
Lehigh University
, 16 Memorial Drive East, Bethlehem, Pennsylvania 18015, USA
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G. Bateman;
G. Bateman
a)
1Department of Physics,
Lehigh University
, 16 Memorial Drive East, Bethlehem, Pennsylvania 18015, USA
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C. Kessel;
C. Kessel
2Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08540, USA
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D. C. McCune;
D. C. McCune
a)
2Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08540, USA
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R. V. Budny
R. V. Budny
2Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08540, USA
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a)
Deceased.
Phys. Plasmas 18, 112508 (2011)
Article history
Received:
August 21 2011
Accepted:
September 26 2011
Citation
T. Rafiq, A. H. Kritz, G. Bateman, C. Kessel, D. C. McCune, R. V. Budny; Effect of pedestal height and internal transport barriers on International Thermonuclear Experimental Reactor target steady state simulations. Phys. Plasmas 1 November 2011; 18 (11): 112508. https://doi.org/10.1063/1.3660265
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