On the Secular Density Rises in NBI-heated H-mode Plasmas in NSTX
- Lawrence Livermore National Laboratory (LLNL)
- Princeton Plasma Physics Laboratory (PPPL)
- ORNL
- University of Washington, Seattle
Plasma-wall interaction analysis is developed at the National Spherical Torus Experiment. At present, poloidally separated recycling and neutral pressure measurements are used to characterize recycling flux trends. The causes of monotonic density increases observed in initial phases of H-mode discharges at t <= 0.2-0.6 s appear to be the monotonically increasing source in the divertor, and particle containment time tau(p)* long in comparison with discharge duration. The ratio of the wall flux to divertor flux is low throughout the density increase phase except in the initial segment, when dN(e)/dt is highest and magnitudes of the wall and divertor fluxes are similar. (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:
- 1020824
- 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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