Modeling of current profile evolution and equilibria in negative central shear discharges in the DIII-D experiment
Recent DIII-D advanced tokamak experiments with negative central shear (NCS) have resulted in operation at high normalized {beta}, {beta}{sub N}={beta}/(I/aB), to 4.2, confinement enhancement factors to H=4 (H={tau}{sub E}/{tau}ITER-89P), and record neutron rates for DIII-D to 2.4X10{sup 16} neutrons/sec. These data were obtained during high triangularity, single and double null diverted operation with peaked (L-mode) and broad (H-mode) pressure profiles. We are modeling the spatial and temporal current profile evolution for these discharges using Corsica, a predictive 1-1/2 D equilibrium and transport code. Current profile evolution is self-consistently determined by including current diffusion resulting from current drive due to early neutral beam injection during the ohmic current ramp-up phase of the discharge and the bootstrap current drive associated with pressure profile evolution.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48; AC03-89ER51114
- OSTI ID:
- 274183
- Report Number(s):
- UCRL-JC-122847; CONF-9606226-2; ON: DE96012907; TRN: 96:017587
- Resource Relation:
- Conference: 23. European Physical Society conference on controlled fusion and plasma physics, Kiev (Ukraine), 24-28 Jun 1996; Other Information: PBD: 20 Jun 1996
- Country of Publication:
- United States
- Language:
- English
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