Implementation of the 3D edge plasma code EMC3-EIRENE on NSTX
- Max Planck Institute for Plasma Physics, Garching, Germany
- Oak Ridge National Laboratory (ORNL)
- ORNL
- Lawrence Livermore National Laboratory (LLNL)
The 3D edge transport code EMC3-EIRENE has been applied for the first time to the NSTX spherical tokamak. A new disconnected double null grid has been developed to allow the simulation of plasma where the radial separation of the inner and outer separatrix is less than characteristic widths (e. g. heat flux width) at the midplane. Modelling results are presented for both an axisymmetric case and a case where 3D magnetic field is applied in an n = 3 configuration. In the vacuum approximation, the perturbed field consists of a wide region of destroyed flux surfaces and helical lobes which are a mixture of long and short connection length field lines formed by the separatrix manifolds. This structure is reflected in coupled 3D plasma fluid (EMC3) and kinetic neutral particle (EIRENE) simulations. The helical lobes extending inside of the unperturbed separatrix are filled in by hot plasma from the core. The intersection of the lobes with the divertor results in a striated flux footprint pattern on the target plates. Profiles of divertor heat and particle fluxes are compared with experimental data, and possible sources of discrepancy are discussed.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1047654
- Resource Relation:
- Conference: 5th International Workshop on Stochasticity in Fusion Plasmas (SFP), Julich, Germany, 20110411, 20110414
- Country of Publication:
- United States
- Language:
- English
Similar Records
Aspects of Three Dimensional Transport for ELM Control Experiments in ITER-Similar Shape Plasmas at Low Collisionality in DIII-D
The three-dimensional modeling of plasma edge transport and divertor fluxes during application of resonant magnetic perturbations on ITER