Measurements and Simulations of Scrape-off Layer Flows in the DIII-D Tokamak
- Lawrence Livermore National Laboratory (LLNL)
- University of California, San Diego
- General Atomics, San Diego
- ORNL
- Sandia National Laboratories (SNL)
Flow velocities of the order 10-20 km/s in the direction of the high-field side divertor have been measured for deuterons and low charge-state carbon ions in the scrape-off layer at the crown of low-density L-mode plasmas, suggesting that these carbon ions at the crown move with the background plasma flow. Simulations with the multi-fluid edge code UEDGE including cross-field drifts due to E x B and B x del B yield calculated divertor conditions which are more consistent with the measurements, but flows at the crown that are stagnant or in the opposite direction than observed. The simulations indicate that both the ion temperature gradient force and deuteron frictional drag play a role in determining the flow direction and magnitude of low charge-state carbon ions. The effect of the assumed radial transport model, toroidal core rotation, and neutral pumping at the divertor plates on the flow at the crown is investigated. (C) 2009 Elsevier B.V. All rights reserved.
- 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:
- 1020823
- Resource Relation:
- Conference: 18th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices, Toldeo, Spain, 20080526, 20080530
- Country of Publication:
- United States
- Language:
- English
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